Photosynthesis Worksheet



UNIT 3 REVIEW: PHOTOSYNTHESIS AND CELLULAR RESPIRATION

3.A- Formulas, ATP/ADP, Organelles, and Energy

1. What is the difference between autotrophs and heterotrophs?

AUTOTROPHS MAKE THEIR OWN FOOD

HETEROTROPHS CONSUME THEIR FOOD

2. Name the chemical compound shown below that cells use to store energy. ATP

Label the parts that compose this molecule:

A= ADENINE

B= RIBOSE

C=PHOSPHATE GROUPS

3. Fill out the chart about ATP/ADP.

How many phosphate molecules does each have? ATP 3 ADP 2

How many adenine molecules does each have? ATP 1 ADP 1

Which compound has more stored energy? ATP > ADP

Which compound results when energy is given

off due to breaking of bonds? ADP

4. What is the overall reaction for photosynthesis? Draw arrows to show what is being oxidized and reduced.

Water ------------------------------( oxygen

6 CO2 + 6H2O ----------------------------( C6H12O6 + 6O2

CO2 -------------------------------------------------> glucose

5. What is the overall reaction for cellular respiration? Draw arrows to show what is being oxidized and reduced.

reduced

oxygen -> water

C6H12O6 + 6O2 (6 CO2 + 6H2O + ATP

Glucose -> carbon dioxide

Oxidized

6. Label the two organelles below. Tell which organelle is involved in photosynthesis and which is involved in cellular respiration.

[pic][pic]

Site of PHOTOSYNTHESIS Site of RESPIRATION

3.B- Photosynthesis and Cellular Respiration

7. Fill out the following chart about photosynthesis and the two stages.

|Stage |Location |Events |

|LIGHT DEPENDENT |THYLAKOID MEMBRANES |SUNLIGHT AND WATER GO IN |

|REACTIONS |(GRANUM) |OXYGEN, NADPH, ATP COME OUT |

| | | |

| | |(INVOLVES AN ETC THAT WILL SPLIT WATER INTO 02 IN PSII AND A PSI THAT REDUCES NADP+ TO |

| | |NADPH. |

| | |ETC GENERATES A PROTON GRADIENT THAT WILL ALLOW ATP SYNTHASE TO PHOSPHORILATE ADP+ INTO ATP)|

|LIGHT INDEPENDENT REACTIONS OR CALVIN |STROMA |CO2, NADPH, ATP GO IN |

|CYCLE | |GLUCOSE, NADP+, ADP COME OUT |

| | | |

| | |(CO2 IS “FIXED” HERE. |

| | |RUBISCO CATALYZES THE REACTION WHERE CO2 AND RuBP FORM PGA. |

| | |NADPH AND ATP ARE USED TO REGENERATE RuBP AND CONTINUE THE CALVIN CYCLE.) |

| | | |

7. What photosynthesis waste product is formed in the light-dependent reactions? O2

8. What two products of the light-dependent reactions are used up in the light-independent reactions?

NADPH AND ATP

9. What happens to carbon dioxide molecules in the light-independent reactions? THEY ARE “FIXED” INTO AN ORGANIC COMPOUND CALLED PGA. RUBISCO CATALYZES THIS REACTION WITH RuBP.

10. What are the differences between the light-dependent reactions and the light-independent reactions?

LIGHT DEPENDENT: NEED LIGHT; HAPPENS IN THYLAKOIDS; MAKES ENERGY (ATP, NADPH)

LIGHT INDEPENDENT; NO LIGHT NEEDED; HAPPENS IN STROMA; USES ENERGY (ADP, NADP+)

11. What other name is given to light-independent reactions?

CALVIN CYCLE

12. Label the diagram below to summarize the two stages of photosynthesis. Use the word bank below the diagram to fill in the blanks.

Word list:

thylakoid 6 light-independent reactions CO2

granum 5 light NADPH

stroma 11 H2O ATP

light-dependent reactions sugar O2

13. Fill out the follwing chart about Cellular Respiration.

|Stage |Location |Events |

| GLYCOLYSIS |CYTOPLASM |Initial process of oxidation of glucose that occurs in the cytoplasm |

| | |converts each molecule of glucose to two molecules of pyruvic acid/pyruvate (a 3-carbon |

| | |molecule) |

| | |an anaerobic process - proceeds whether or not O2 is present; O2 is not required |

| | |net yield of 2 ATP per glucose molecule |

| | |net yield of 2 NADH per glucose (NADH is nicotine adenine dinucleotide, a co-enzyme that serves|

| | |as a carrier for H+ ions and electrons from breaking down glucose) |

|KREBS CYCLE (CITRIC ACID CYCLE) |MITOCHONDRIAL MATRIX |The pyruvic acid diffuses into the mitochondrion where a transition reaction (‘grooming’/ |

| | |pre-Krebs) occurs that serves to prepare pyruvic acid for entry into the next stage of |

| | |respiration. The two 3-Carbon pyruvates each lose CO2 and become acetylCoA. 2 total CO2 are |

| | |produced (*as well as 2 NADH) |

| | |2 ATP ARE PRODUCED, 6 NADH, 2 FADH2, 6 CO2 |

|ELECTRON TRANPORT CHAIN (OXIDATIVE |MITOCHONDRIA’ INNER MEMBRANE |electrons are released from NADH and from FADH2 and as they are passed along the series of |

|PHOSPHORILATION AND CHEMIOSMOSIS) | |proteins, they give up energy which is used to fuel a process called chemiosmosis by which H+ |

| | |ions are actively transported across the inner mitochondrial membrane into the intermembrane |

| | |space. The accumulation of H+ ions (protons) cause ATP Synthase in the membrane to change |

| | |shape, and they flow back through the membrane and cause ~ 32-34 ATP’s to be produced. |

| | |6 H2O are formed when the electrons and H+ unite with O2 at the end of electron transport chain|

14. How many ATP are made in the glycolysis part of cellular respiration?

2

15. How many ATP are made in the Kreb’s cycle and electron transport part of cellular respiration?

2 ATP IN KREBS; 32 ATP IN ETC

16. In which phase of cellular respiration is carbon dioxide made? Water?

CO2: KREBS.

WATER: ETC

17. What would happen to the cellular respiration process if the enzyme (aka catalyst) for one step of the process was missing or defective?

NO ATP WOULD BE PRODUCED

18. Fill out the following diagram about Cellular Respiration.

Word List

Glycolysis Kreb’s Cycle ATP Oxygen Gas

ATP ATP Carbon Dioxide Electron Transport Chain

Water Electrons Carriers Calvin Cycle ADP

3.C- Anaerobic Cellular Respiration

19. What are the 2 metabolic pathways a cell can use and what determines which pathway is used?

IN ANAEROBIC RESPIRATION:

GLYCOLYSIS: GLUCOSE ->PYRUVATE-> LACTIC ACID (MUSCLE CELLS AND DAIRY BACTERIA)

GLUCOSE -> PYRUVATE -> ETHANOL (YEAST, SOME BACTERIA)

20. Where does the process of fermentation take place? CYTOPLASM

-----------------------

oxidized

light

reduced

GRANUM

MATRIX

CHRISTAE

OUTER

MEMBRANE

INTER MEMBRANE SPACE

INNER MEMBRANE

OUTER MEMBRANE

LUMEN (SPACE)

THYLAKOIDS

STROMA

INNER MEMBRANE

OUTER

MEMBRANE

SUNLIGHT

2. H20

CO2

5.

6. LIGHT DEPENDENT REACTIONS

11.

LIGHT INDEPENDENT REACTIONS

_

ATP

NADPH

10. O2

GLUCOSE

4. STROMA

9.

4. _____

12. _______

O2

NADH, FADH2

ETC

KREBS

GLYCOLYSIS

H2O

32ATP

CO2

2ATP

2ATP

PYRUVATE

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