photosynthesis and cellular respiration test quizlet

Water regulates the turgor pressure. to break up the reactants and puts them into products. The energy within and the hydrogen molecules are used to energize reactions throughout the cycle. One is a PDF Test with 7 multiple choice questions, 7 fill in the blank questions and 6 matching questions. The interactive nature of the activities will immerse students and accelerate their learning and enjoyment in your class. why or why not. Photosynthesis produces the oxygen to replenish oxygen that is used up by living organisms during respiration. Energy is released from ATP when A. Photosynthesis and Cellular Respiration Test Review 5.0 (4 reviews) Term 1 / 55 What is an autotroph? Which of the following is NOT a difference between photosynthesis and cellular respiration A. C02-carbon dioxide; exhale the carbon dioxide, what is the main product from Cellular respiration, does cellular respiration follow the Law of Conservation, yes because the laws of conservation states that energy cant be created or destroyed but can be transferred, what is the importance of this process to members of a food web, it helps them gather food and energy to survive. explain why the word sunlight is above the arrow in the photosynthesis equation. oxidative phosphorylation The light reactions take place during the day because they need light. What are autotrophs? ", Biologydictionary.net Editors. water Heme groups are also seen bound to hemoglobin, in blood cells. What do plants use to create chemical energy (sugar/glucose)? What Is Fermentation? Photosynthesis produces the glucose that is utilized in cellular respiration to produce ATP. What are the reactants and products of the Light-Dependent reaction? The green color comes from the light that plants absorb and reflect. This is the entire range of radiation. Buy the bundle now and get updates for life, even when new products are added. The equation for photosynthesis of plant cells is: 6CO2 + 6 H2O + Sunlight C6H12O6 + 6O2 ( 6 Carbon Dioxide + 6 Water + Sunlight Glucose + 6 Oxygen ) Cellular Respiration Equation It is important to note that cellular respiration, in general, is not a single process but is, in fact, a set of metabolic reactions. Save yourself lots of time (and your own ATP) and make creating your biology lesson plans a breeze!Photosynthesis and respiration are some of the most difficult topics to teach in a Biology or Life Science course. Where does it take place? They organize chlorophyll and other pigments into clusters called Photosystems, which are systems that use light. In which way are photosynthesis and cellular respiration different? Only one breaks glucose down C. Only one relies on a cycle of carbon molecules, 2. Y0|VRg#^T~5-E^5D~e\|5b5_`0(c8 2I`4MIHcNVo'B-cml0aLTR%-6hb( V(l0'2Lb(El$ The Calvin Cycle uses ATP and NADPH from the light-dependent reactions to produce high-energy sugars. To do this, the chloroplasts will combine units of carbon dioxide into chains of 6 carbons, 12 hydrogens, and 6 oxygens. Assessment is a valuable tool that can be used to gather this important information. They are a great resource for test prep, or a homework assignment to review learning. Instead of iron, these heme cells bind magnesium. Plants absorb most all colors except green light. c. are usually most abundant on the upper epidermis of a leaf. The Krebs cycle is similar to the Calvin cycle, in that it recycles certain molecules to continually drive the production of electrons and ATP. Alcoh, This activity can used to reinforce vocabulary and concepts regarding cellular energetics, including: photosynthesis, cellular respiration, and ATP. It is the flow of an electron from the beginning to the end of the photosystems, without moving in a circular reaction. There is Turgor Pressure inside the guard cells. Photosynthesis releases energy, while cellular respiration stores energy. In this lab students will learn that plants only do photosynthesis in the light and in the dark cellular respiration occurs. They have a reaction center and multiple light-harvesting complexes. The PPT is designed to cover in detail the unpacked standards. Only one uses sunlight B. \rule{3cm}{0.15mm}. Besides the organisms that rely on sulfur near hydrothermal vents, the majority of life on Earth relies on the sugar glucose. ADP has only 2 phosphate groups instead of three. Each topic contains a PowerPoint presentation, Notes Outline, Homework Assignments, Quizzes, and Unit Exam. (glucose). While chloroplasts are only found in plants, mitochondria are found in all living eukaryotes. carbon dioxide + water -----> glucose + oxygen. Bacteria, the simplest organisms, likely represent a fairly unchanged version of the first form of life. Oxidative phosphorylation is also known as: What does the final electron acceptor (1/2 O2) become after the ETC? They are found mainly in the mesophyll cells of the planet. What was the independent variable in this experiment? list the reactants of cellular respiration and explain exactly how an animal will collect these materials. Glycolysis happens within the cytosol of the cell, outside of the mitochondria. What is the spectrum of light that plants absorb called? krebs all of these. C3 plants are more common. Because it's not a good way to store energy. Are you getting the free resources, updates, and special offers we send out every week in our teacher newsletter? glycolysis How well do you understand photosynthesis and cellular respiration? An electron is passed through a polypeptide chain until it reaches the final electron acceptor, and creates ATP. Cellular respiration cannot occur without photosynthesis, and photosynthesis certainly cannot occur without the help of its partner. glycolysis Cellular respiration is a cell's way of obtaining energy, so it's a process you depend on in order to live. Thank you! The photosystems create NADPH, which is used in the dark reactions to create glucose. Definition and Examples, Anabolism and Catabolism Definition and Examples, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College. A stack of thylakoids is a granum. Water leaves because of evaporation. Humans, animals and plants depend on the cycle of cellular respiration and photosynthesis for survival. This process uses sunlight energy and turns it into chemical energy that assists in cellular respiration. For last five fill in, put the steps in order from 1-5 in the order they occur. list the products produced during photosynthesis and describe how plants use each of these materials. She has taught science courses at the high school, college, and graduate levels. Why are the leaves and stems of a plant green? Turgor pressure in the guard cells regulates this. These 100 multiple choice questions call on students to remember, understand, apply, analyze and evaluate. endobj The carbon dioxide produced during respiration is released from the body and absorbed by plants to help provide the energy they need for growth and development. Similarities between Photosynthesis and Cellular Respiration, Differences between Photosynthesis and Cellular Respiration. They are the dark reactions (Calvin Cycle), and the light reactions. Photosynthesis happens in The day and they occur in the chloroplast. What is the electron donor(s) for the ETC? Mitochondria endobj What is the theory that mitochondria are a cell eaten by another cell to form a eukaryotic cell. McMahon, M. J., Kofranek, A. M., & Rubatzky, V. E. (2011). Photosynthesis releases energy, while cellular respiration stores energy. Use the resource and the answer key for student self-assessment or peer review. This ancestor then diverged, over hundreds of millions of years, into the millions of species we see on Earth today. Some images used in this set are licensed under the Creative Commons through Flickr.com.Click to see the original works with their full license. Glyco- refers to glucose, where -lysis refers to something being divided or split in half. At the bottom of the food-chain sit the photosynthetic organisms. analyzing experiments The great thing about Google Forms is that the teacher can edit questions. ), but also provides a fantastic learning opportunity where your kids are learning through assessment. This is glucose, which can then be modified and combined with other glucose molecules to be stored as starches and complex sugars like fructose. Cellular Respiration's goal is to answer choices make water make ATP make glucose make oxygen Question 11 120 seconds Q. For the photosynthesis or cellular respiration, choose where the statement occurs or is a charactaristic of photosynthesis or cellular respiration. Cellular respiration involves the breakdown of glucose and the storage of the energy received into the molecule ATP. How does gas exchange take place in a leaf? The electron becomes unstable, causing the electron to lose energy as heat. when plants convert solar energy (sunlight) into their own food & energy, stored as chemical energy. The Topics are: academy photosynthesis test questions national 5 . Make sure that you and your students are prepared for these changes. These are the other pigments plants have that we see a lot of in the fall (i.e. 3 points; equations 1/2 point each, other answers point each. Ecology is also the study of how various organisms interact with each other while carrying out these reactions. Photosynthesis and cellular respiration are both part of a mutually beneficial relationship. chemiosmosis, 6. Biologydictionary.net Editors. Cellular Respiration and Photosynthesis Example Question #1 : Help With Glycolysis The carbohydrate mannose is not present in the standard glycolytic pathway. Carbon fixation incorporates carbon into organic compounds for later use. Known the equations for both photosynthesis and cellular respiration. . (plants) Click the card to flip Flashcards Learn Test Match Created by regina_lankenau Terms in this set (55) What is an autotroph? . At the top of the diagram, light and water combine in the chloroplasts, where the hydrogens are separated from the oxygen in chain of proteins starting from the energy-collecting cytochromes and accessory pigments. How are photosynthesis and respiration related? The separate tests are more detailed with more total questions. It is the light that is absorbed and has the most effectiveness. What is the chemical equation for cellular respiration? Because an herbivore must consume many photosynthetic organisms to grow, there are many less organisms on this level of the food-chain. This theory suggests that chloroplasts were originally photosynthetic bacteria, and that mitochondria were originally bacteria capable of oxidative phosphorylation. Oxygen is produced as a by-product. Anabolic Reactions What is the product created by both of the photosystems? chemiosmosis glycolysis calvin cycle krebs cycle 2. For the following ganglia, determine the location and the division of the ANS each is part of: sympathetic trunk ganglia, prevertebral ganglia, terminal and intramural ganglia. Various topics on the subject highlight the history, importance, process and future of photosynthesis. Products: 6O2 (oxygen) ^^ 8h"c{,&*Z ,k. Aerobic vs. Anaerobic Reaction Cells then use electron carriers to transport those high-energy electrons from chlorophyll to other molecules. See If You Understand Cellular Respiration. These lessons sell individually for $6; as a bundle they are 35% off, for $3.90!Included Products: Photosynthesis Cellular Respiration========================================================Customer Tips: How to get TPT credit to use on future purchases:Go to your "My Purchases" page. C6H12O6 + 6O2 ---> 6CO2 + 6H2O. Palisade mesophyll because it's more packed. Difficulty Level: | Created by: Last Modified: Stomata. Others are able to photosynthesize, like primitive single-celled plants. One step above plants and algae, herbivores exploit the bounty that plants produce. - Word Bank They are called P680 (PS2) and P700 (PS1). Which areas of the spectrum allowed the algae to produce the most oxygen gas? The 10 remaining 3-carbon molecules are converted back into 6 five-carbon molecules, which are used to begin the next cycle. Which of the following processes produces the most ATP? Great job! Some of the G3P molecules get recycled into RuBP. glycolysis inhibition How does CO2 enter the leaf and O2 leave? No matter how you choose to use them, you can be sure that your students will be actively engaged and practicing critical thinking on multiple levels of difficulty.PLEASE NOTE: These task cards are also included in my ATP, Photosynthesis & Cellular Respiration Unit BundleEach of the 28 task cards includes:1. The entire process of photosynthesis can be seen below. photosynthesis conversion of light energy from the sun into chemical energy. These molecules, glucose molecules, are the basis of all life on Earth. Through the stomata. During the day, stomata are open (sunlight for photosynthesis) but at night they close to conserve water. In doing so, they store energy in the bond between these molecules, and create an ATP. Cellular respiration produces oxygen, while photosynthesis uses oxygen. In hot dry conditions, stomata may close even in bright sunlight. The light reactions are because they use the light to excite electrons which help form NADPH from NADP+. answer choices Cellular respiration stores ATP, while photosynthesis releases ATP. Notice that the addition of one carbon dioxide in one turn of the reaction produces the 3-carbon molecule 3-phoshphoglycerate. 1. The two power points included have over 250 slides covering the Living Organisms Unit. Chloroplasts/Chlorophyll/Pigments This test is NOT included in the photosynthesis and cellular respiration bundle. Which of the following occurs in both photosynthesis and The numbers represent the spectrum of light thata athey absorb the best. It's closely packed so as to capture as much sunlight as possible. Why do most cells only have a small amount of ATP? Where does the hydrogen get pumped into the inter-membrane space? However, there is a large body of evidence which points to the fact that all life has a common ancestor. What are the three phases of the Calvin Cycle? Retrieved from https://biologydictionary.net/cellular-respiration-and-photosynthesis/. What are the three different types of plants with adaptations to resist photorespiration and help increase photosynthesis efficiency? 4 0 obj Parts of a Flower This download includes 3 days worth of PowerPoint slides, corresponding printable packet, two sets of manipulative cards, a review sheet with answer key, and a lab with answer key for your students. It is very waxy. Add highlights, virtual manipulatives, and more. Photosynthesis is the conversion of light energy into chemical energy that is stored in sugar. photosynthesis occur a. Thylakoid b. Nucleus c. Cell d. Chlorophyll 36. The chloroplast uses the energy harnessed from these photons and their interaction with the cytochromes and other proteins to drive the formation of glucose. B. Xylem=transports water Photosynthesis involves the use of energy from sunlight, water and carbon dioxide to produce glucose and oxygen. This electron transport chain uses a series of electron driven enzymes, which specialize in binding loose phosphate groups to ADP. The complex structure of the heme interacts with the photons of light passing through them. 2 0 obj It generates between 32-34 ATP molecules. In which way are photosynthesis and cellular respiration different? (Choose how wide it is.) The chloroplast is the organelle that is responsible for photosynthesis. Cellular respiration happens in the mitochondria, a small organelle similar to the chloroplasts. As such, they could take in large quantities of smaller bacteria. Autotrophs are living organisms that can produce their own food for energy. Phloem= transports nutrients (sugar). This reads the amount of light absorbed and helps read the amount of light absorbed by photosynthesis. With on photon of light, an electron enters an excited state. This DNA is replicated separately from the main DNA found within the nucleus. Cellular respiration has 4 distinct processes, which drive the creation of ATP. An experimenter wants to separate silver atoms in a Stern-Gerlach experiment by at least 1 cm as they exit the magnetic eld. The test is multiple choice, matching, and short answer. which of the following is not one of the complex carbohydrates? "Cellular Respiration and Photosynthesis." This is where the process of cellular respiration takes over. Photosynthesis Once the glucose is created by the chloroplasts, it can be used to drive other reactions within the cell. In a photosystem, these complexes allow light to be harvested and used across more surface area of the photosystem. The band between 380nm and 780nm is important because it is the spectrum seen by the human eye and the light that plants absorb. Which of the following statements is FALSE? interpreting diagrams Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. {5IQMfIJD@! - Teacher Answer Key Why are plants called autotrophs? In reduction, 3-biphosphoglycerate is created, NADPH reduces 3-biphosphoglycerate into G3P. BONUS QUESTION ON TEST>>> 2 points; point each. Bacteria needs more oxygen gas and more sunlight to thrive. Where do the air spaces connect with the exterior? Water is brought in through the roots (xylem) and lost in the leaves (evaporates). a green pigment found in the chloroplasts of plants. Gas exchange and releases water. Cellular respiration has 4 distinct processes, which drive the creation of ATP. Products vs. Reactants Photosynthesis Equation They go through the Calvin cycle in the bundle sheathe cells. Together, the processes of photosynthesis and cellular respiration allow life on Earth to gather energy for use in other reactions. They are Light Dependent (light collecting). They under go photorespiration. glycolysis This membrane is loaded with specialized proteins, capable of transferring energy derived from the passing of electrons down their potential gradient. understanding chemical equations What relation does colour have to absorbance and reflection? lactic acid fermentation CELLULAR RESPIRATION AND PHOTOSYNTHESIS TEST Term 1 / 65 Autotroph Click the card to flip Definition 1 / 65 an organism capable of synthesising its own food from inorganic substance - plants Click the card to flip Flashcards Learn Test Match Created by Mia_Rasamny Terms in this set (65) Autotroph Photosynthesis and Cellular Respiration Test, Review Questions, and Answer Keys, Photosynthesis and Cellular Respiration Unit Bundle - PPT, Activities, Test, Photosynthesis and Cellular Respiration Task Card Activities Bundle, Photosynthesis and Cellular Respiration Unit - Doodle Notes BUNDLE, Cellular Respiration and Photosynthesis - 7 Engaging Lab Station Activities, Photosynthesis and Cellular Respiration - Complete 5E Lesson Bundle, Cell Processes & Energy Notes, PowerPoint and Test, Life Science Notes, PowerPoint & Chapter Tests Bundle, Biology End of Course and State Test Review Bundle, Photosynthesis & Cellular Respiration Task Cards, Biology Task Cards Bundle: Ecology, Biochemistry, Cells, Energetics, Genetics, Photosynthesis & Cellular Respiration Concept Map, Biology Concept Map Bundle: Ecology, Biochemistry, Cells, Energetics, & Genetics, Carbon Cycle Lab- Photosynthesis and Respiration, Photosynthesis and Cellular Respiration Bundle, Cell Energy Worksheet for Review or Assessment of Photosynthesis and Respiration, Cell Energy Bundle of Photosynthesis and Respiration Activities and Assessments, Photosynthesis and Cellular Respiration (cut & paste) Activity, Living Organisms Unit: Flower Parts, Photosynthesis, Respiration Unit, Middle School Science and Other Loose Ends, NC Science Bundle- Entire Year - All Standards- Powerpoint and Word Wall, 3-Day lesson Introduction to Photosynthesis and Cellular Respiration, Photosynthesis and Cellular Respiration Test, Photosynthesis and Cellular Respiration Unit Bundle - 8 Files, AP Biology Comprehensive Review plus Resources for Unit 3: Cell Energetics, BUNDLE AP Biology Full Year Curriculum Review/Learning Guides for Each Unit, Biology Task Review: Photosynthesis and Cellular Respiration Task Cards, AP Biology Unit 3: Cellular Energetics PowerPoint, AP Biology PowerPoints- FULL YEAR Bundle- Distance Learning Compatible, Photosynthesis Test Bank:100 Editable Multiple Choice Questions for Biology, 7th grade cellular respiration and photosynthesis test - at or above level. Which of the following is necessary for oxidative phosporylation to occur? This process begins with the production of Acetyl-CoA: Instead of digesting them, they created a safe space for them and helped them produce more energy. fermentation How do the two sets of photosynthetic reactions work together? Cellular Respiration What about Carbon Dioxide? Or assign it as a quiz for a summative assessment. Custom clipart brings the stages of each process to life and helps students to remember the concepts. The download introduces photosynthesis and cellular respiration; the lab is a visual reinforcement looking at how the same molecules are found in the two processes. This process uses NADH and FADH2 to produce ATP fermentation A) the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark. This ATP can be used in a number of cellular reactions, and provides activation energy to help enzymes complete tasks. This is where the process of cellular respiration takes over. A number for easy. C6H1206-glucose;to make energy and helps make food. Adenine, 3 phosphates, and a 5-carbon sugar (ribose). In this process, the 6-carbon glucose molecule is split into two molecules of pyruvate. photosynthesis makes glucose that is used in cellular respiration to create ATP, geometry: line and angle relationship vocab, David N. Shier, Jackie L. Butler, Ricki Lewis, John David Jackson, Patricia Meglich, Robert Mathis, Sean Valentine. This item is included in a Photosynthesis and Cellular Respiration Bundle for a 20% discount. How are my Color By Numbers Useful? Use as a summative assessment Use as a test review or a quiz Use as an emergency science sub plan Use for classwork, homework, early finishers, extra credit, stations activity, and more! Includes non-cutesy graphics that both tweens and teens will enjoy coloringIncluded in this BundleCharacteristics of Living Thing. If photosynthesizing green algae are provided with CO2 containing heavy oxygen (18O), later analysis will show that all of the following molecules produced by the algae contain 18O except answer choices glucose 3 phosphoglycerate. The following topics are covered in the biology end of course review bundle:*Experimental Design*Biochemistry*Cells & Cellular Reproduction*Photosynthesis & Cellular Respiration*Heredit, These flash/task cards can be used to review essential concepts for the Photosynthesis & Cellular Respiration unit in Biology. Eventually, some of the predatory bacteria became quite large. During the night? The process by which carbon changes from carbon dioxide to glucose and back is called a. Glycolysis b. Author Dr. George B. Johnson, <> Once the glucose is created by the chloroplasts, it can be used to drive other reactions within the cell. The stomata mainly function to absorb CO2 and release O2. They gain a great deal of energy. You can find the updated course description guide here. glycolysis occurs in the mitochondria They are the succulent plants (ex: cactus) that store needed organic material during the night and use them during the night. What is the epidermis of a leaf covered by? 3. Many stacks are grana. Quiz: Cellular Respiration 1. The process of photosynthesis is used by plants and other photosynthetic organisms to produce energy, whereas the process of cellular respiration breaks down the energy for use. This is achieved through photosynthesis, where the plant gets to change the energy from the sunlight to produce glucose and oxygen as byproducts. Biologydictionary.net, August 15, 2018. https://biologydictionary.net/cellular-respiration-and-photosynthesis/. cycle, 4. glycolysis fermentation Beside each purchase you will see a "Provide Feedback" button. Biologydictionary.net Editors. So as to allow photosynthesis to take place but not so much that they lose an excessive amount of water. Where does ETC take place in the mitochondria? catalyzes the reduction of two molecules of PGAL to form glucose. Our goal is to educate people about photosynthesis, a chemical process that fuels life on earth. It can, however, enter glycolysis by first being converted into another sugar. The light-dependent reactions trap light energy in chemical form. This 2 page Photosynthesis and Cellular Respiration Quiz 2 has 6 multiple choice and 1 short answer question on the topics of: Energy in Living Systems, Building Molecules that Store Energy, Metabolism, Photosynthesis, Autotrophs, Breaking Down Food for Energy, Heterotroph, Cellular Respiration, A. This file includes: yes because the atoms in the reactants are conserved in the products. C. ethyl alcohol. This is the consumption of O2 while producing CO2, and it ocurs in the light. _____ 3. What happens when a photon of light is absorbed? What are the reactants and products of the Light-Independent reaction? This bundle has been recently updated to include even more engaging resources that keep your students interested and help make teaching t, These task cards are a great way for students to test their knowledge on photosynthesis and cellular respiration. You know a lot about cellular respiration and how it works. Takes place in the Calvin Cycle. SMCHS US History Semester 1 Final (Study Guid, John David Jackson, Patricia Meglich, Robert Mathis, Sean Valentine, Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis. This process uses sunlight energy and turns it into chemical energy that assists in cellular respiration. Plants are called autotrophs because they make their own food through photosynthesis. Which of the following statements is FALSE? All individual components of this curriculum can be purchased and viewed separately in my main catalog.My PowerPoint presentations have been made to be both informative on cur, Aligned to the AP Biology Course and Exam Description! Animals are related to the ancient organisms which did not receive photosynthetic endosymbionts, and instead relied on consuming other organisms. They allow gas exchange between air spaces in the spongy mesophyll and the exterior by opening their stomata. calvin cycle NADP+ stores energized electrons taken from water. Takes place in the granum. (plants) Cellular respiration produces oxygen, while photosynthesis uses oxygen. Thus, the smaller endosymbiotic bacteria became the first organelles. Some questions may be asked in a different way to work for Google Forms. Photosynthesis releases energy, while cellular respiration stores energy. ATP and NADPH are then used within the Calvin Cycle, a series of reactions which recycles these electron-carriers and produces glucose. This is a test that covers Cellular Respiration and photosynthesis it is written for students at or above a 7th grade reading level. You throw a baseball straight up with an initial speed of 150km/h150 \mathrm{~km} / \mathrm{h}150km/h. proprofs quiz photosynthesis aqa test questions aqa bbc bitesize quiz photosynthesis cliffsnotes brainpop photosynthesis flashcards quizlet science quiz biology photosynthesis ducksters 25 9. Take this quiz to test your understanding of the process of cellular respiration. The calvin cycle binds CO2 to RuBP (ribulose bisphophate) through of rubsico. What happens to electrons in chlorophyll when lots of sunlight is absorbed? B. Washington University, the light-dependent reactions involving photosystems I and II, are more likely to produce red light than blue light, visible light is not part of the electromagnetic spectrum, narrow absorption range but high efficiency, narrow absorption range but low efficiency, wide absorption range but high efficiency, Photosystem I - uses the P700 molecule in its photocenter, antenna complex - contains hundreds of pigment molecules, CAM plants - open their stomata during the day and close them at night to avoid photorespiration, the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark, photorespiration is more efficient at producing glucose than is photosynthesis, the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions, photosynthesis occurs only in autotrophs; cellular respiration occurs only in heterotrophs, photosynthesis uses solar energy to convert inorganics to energy-rich organics; respiration breaks down energy-rich organics to synthesize ATP, photosynthesis involves the oxidation of glucose; respiration involves the reduction of CO2, the primary function of photosynthesis is to use solar energy to synthesize ATP; the primary function of cellular respiration is to break down ATP and release energy, photosynthesis and cellular respiration occur in separate, specialized organelles; the two processes cannot occur in the same cell at the same time.