Name(s): Period: Date:

3.23 CW Linking Photosynthesis and Cellular Respiration

BackgroundAs the basis for understanding where the energy for cellular respiration flows, it is important to comprehend how photosynthesis and cellular respiration are linked. Each of these two processes could not exist without the other. What one process produces, the other one uses. This activity will model the relationship between photosynthesis and cellular respiration to help you better understand the energy demands placed on your body during exercise. MaterialsLinking Photosynthesis and Respiration

worksheetColored pencils/markers

ScissorsTape

Procedure/DirectionsTask

1 Use the colored pencils or markers to color in the pieces on the “Linking Photosynthesis and Respiration” worksheet. The worksheet details the colors to use.

2 Tape together the chloroplast and mitochondria.3 Starting with the sun being placed at the top of the chloroplast, fill in the pieces using

the diagram below.4 Answer the analysis questions based on your completed puzzle.5 Keep your pieces and practice the puzzle until you are able to put it together without

checking the diagram below.

Cellular Respiration and Exercise, HASPI Medical Biology Lab 08a243

Name(s): Period: Date:Answer the following questions using your puzzle and the step-by-step directions in the left column.

The Steps Between Photosynthesis and Cellular Respiration

Remember that ATP is the molecule that stores energy. Adenosine Tri-Phosphate has multiple bonds that can harness and hold light energy. When a phosphate bond is broken, that energy is released and available for the organism to use. ATP becomes ADP (Adenosine Di-Phosphate).

http://www.goldiesroom.org/Multimedia/Bio_Images/07%20Respiration/03%20ADP%20to%20ATP.jpg

a. How does ADP become ATP? Explain your answer.

Cellular Respiration and Exercise, HASPI Medical Biology Lab 08a244

Name(s): Period: Date:Photosynthesis: In the

ChloroplastResponse

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Name(s): Period: Date:1. Absorbing Sunlight b. What is the purpose of photosystems I and II?

c. Where is chlorophyll able to store the sunlight it absorbs?

d. What is the importance of electrons in bonding molecules?

e. What is the importance of NADPH and ATP?

f. The electrons for photosynthesis come from:

g. Is the oxygen produced from splitting water used in photosynthesis? Explain your answer.

h. What is the purpose of the Calvin cycle?

i. The carbon, oxygen, and hydrogen to make glucose come from:

j. The energy stored in the bonds of glucose comes from:

k. How do NADPH and ATP result in NADP+ and ADP?

Photosystems I and II are proteins full of a pigment called chlorophyll that is actually able to absorb light from the sun. Chlorophyll can absorb sunlight and charge electrons. (Remember that electrons are what hold bonds between molecules!)

The light energy is absorbed into these electrons and passed into the bonds of two molecules: NADPH and ATP. Both of these molecules are now charged with extra energy (from the sun) and are passed to the Calvin cycle.

2. Where Do the Electrons Come From?

They come from water molecules (H2O) that are split into H+ atoms and O2, which releases the electrons to be used by chlorophyll. The oxygen is released where it can be used in cellular respiration.

3. Passing the Charged Electrons

The Calvin cycle goes through a series of chemical reactions that uses the energy (electrons) that were stored in NADPH and ATP to produce glucose (C6H12O6). Since glucose is made of carbon, oxygen, and hydrogen, CO2 is needed. The hydrogen comes from NADPH.

To release the energy (electrons) into glucose, the H+ atom is split from NADPH and ATP loses a phosphate, resulting in new molecules: NADP+ and ADP. These return to the light reactions to be recharged. The charged electrons are used to make the bonds in glucose.

Cellular Respiration: In the ResponseCellular Respiration and Exercise, HASPI Medical Biology Lab 08a246

Name(s): Period: Date:Cytoplasm

1. Splitting Glucose l. How can you get glucose into your body?

m. What is the purpose of glycolysis?

When an organism consumes a plant, it is taking in the glucose that contains the charged electrons from sunlight.

In a process called glycolysis, glucose enters the mitochondria and is split in two to form a simpler molecule called pyruvate. A small amount of the energy that was stored in glucose is stored in ATP.Cellular Respiration: In the Mitochondria

Response

2. Transferring the Energy/Electrons From Pyruvate

n. What is pyruvate?

o. What is the purpose of the Krebs cycle?

p. The CO2 comes from:

q. What is the purpose of the electron transport chain?

r. How many ATP are produced in the electron transport chain?

s. How do NADH and FADH2 result in NAD+ and FAD+?

t. We breathe in oxygen to be used in cellular respiration. How is oxygen (O2) actually used?

u. Our body heat comes from:

v. What is the purpose of ATP?

Pyruvate enters the mitochondria and into the Krebs cycle. The Krebs cycle goes through a series of chemical reactions that breaks apart the bonds in pyruvate and stores the energy from those bonds in a molecule called NADH, FADH2, and 2 ATP. CO2 is produced as a by-product and released where it can be used by plants in photosynthesis to create glucose.3. The Electron Transport Chain:

Transporting the Energy/Electrons to ATP

NADH and FADH2 move to the electron transport chain where they are used to release the energy to make 34 ATP molecules! NADH becomes NAD+ and FADH2 becomes FAD+ and both return to the Krebs cycle to be reloaded with energy. As the hydrogen atoms (H+) are stripped off in the electron transport chain, they bond with oxygen (O2) to form water (H2O).

4. Some Energy is Lost As HeatCellular respiration is not 100% efficient. As the energy is transferred between molecules, some of it is lost from the body as heat.ATP is used as the energy source for our bodies. Anytime energy is needed, a phosphate is broken off of ATP and the energy that was stored in that bond is released for use by the body.

Cellular Respiration and Exercise, HASPI Medical Biology Lab 08a247

Name(s): Period: Date:

Tying It Together: Photosynthesis AND Respirationw. What reactants are needed for photosynthesis? What is produced in photosynthesis? (HINT: look at what is entering the chloroplast and what is leaving the chloroplast)

x. What reactants are needed for respiration? What is produced in respiration? (HINT: look at what is entering the mitochondria and what is leaving the mitochondria)

y. What is the chemical equation for photosynthesis?

z. What is the chemical equation for respiration?

aa. Explain how these two equations relate to each other.

Cellular Respiration and Exercise, HASPI Medical Biology Lab 08a248

Name(s): Period: Date:Try to fill in the following chart with the correct description WITHOUT looking at your own puzzle.

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