1. PHOTOSYNTHESIS REVIEW
PHOTOSYNTHESIS REVIEW

2. NAME THE MOLECULES
5 carbon CO2 acceptor that combines with CO2 in the first step of the Calvin cycle
________________________________
Enzyme that catalyzes the addition of CO2 to RuBP
________________________
3 carbon sugar produced during the Calvin cycle that can be used to build glucose and other organic molecules
______________________________
Ribulose biphosphate (RuBP)
RuBP carboxylase (RUBISCO)
Glyceraldehyde-3-phosphate (G3P)

3. To make one glucose molecule, the Calvin cycle uses
_____ molecules of CO2
_____ molecules of ATP
_____ molecules of NADPH 6 18 12
Campbell concept check 10.3

4. NAME THE MOLECULES PEP carboxylase ATP synthase cytochromes
Enzyme that adds CO2 to make a 4 carbon molecule before entering the Calvin cycle in C4 and CAM plants
________________________________
Cluster of proteins in the thylakoid membrane that uses the energy of a hydrogen ion gradient to add an inorganic phosphate group to ADP
________________________
Iron containing proteins that make up the electron transport chain
______________________________
PEP carboxylase
ATP synthase
cytochromes

5. NAME THE MOLECULES water carotenoids
Molecule that is split during the light reaction to supply H+ ions for the concentration gradient and electrons to replace those lost by chlorophyll
________________________________
Yellow and orange pigment molecules that broaden the spectrum of colors used to drive photosynthesis and also protect chlorophyll by dissipating excess light energy
_________________________
water
carotenoids

6. NAME THE COFACTOR found in the
cytochromes of the electron transport chain _____
NAME THE COFACTOR found in the center
chlorophyll molecule _____
Which color of light is least effective in driving photosynthesis?
Fe (iron)
Mg++ (magnesium)
Campbell Concept check 10.2
Green; green light is reflected not absorbed

7. Name the chlorophyll molecules found in the reaction center of Photosystem II.
Explain why chlorophyll excited by light will fluoresce and give off heat when removed from cell, but not in intact chloroplasts.
Chlorophyll a (P680)
Excited electrons can’t pass
their energy on to the electron transport chain if removed from chloroplasts. Energy is given off as heat and light (fluorecence) instead

8. What is the purpose of cyclic electron flow? Chlorophyll b (P700)
Name the chlorophyll molecules found in the reaction center of Photosystem I.
What is the purpose of cyclic electron flow?
Chlorophyll b (P700)
Non-cyclic electron flow produces equal amounts of ATP and NADPH, but Calvin cycle requires more ATP than NADPH.
Cyclic electron flow can make up the difference by
making more ATP without making NADPH.
Cell can switch to cyclic electron flow, if NADPH is high and cell needs more ATP to run Calvin cycle

9. Instrument that measures the proportions of light of different wavelengths absorbed and transmitted by a pigment solution
Energy coupling mechanism that uses energy stored in the form of a hydrogen gradient across a membrane to drive cellular work, like the synthesis of ATP
spectrophotometer
chemiosmosis

10. NAME THE PARTS granum thylakoid
Gel-filled space outside the stacks = ______________
Gel-filled space outside the chloroplast = __________________
cytoplasm
stroma
Stack of sacs = __________
granum
MEMBRANE SAC
= _________________
Gel-filled space inside the membrane sac = _________________
thylakoid
Thylakoid space

11. Water (H2O)
#1 = ______________
#2 = ______________
#3 = ______________
#4 = ______________
#5 = ______________
Oxygen (O2)
Carbon dioxide (CO2)
Carbohydrates
Sunlight (light energy)

12. Name the 2 kinds of plants that use alternative methods of carbon fixation which joins C02 to make a 4 carbon molecule before entering the Calvin cycle
What does CAM stand for?
In which types of climates would you expect to find more of these plants?
C4 and CAM
Crassulacean acid metabolism
Hot, dry regions

13. Tell the place where the enzymes for the light reactions are located
Tell the place where the Calvin cycle happens
In membranes of thylakoids
stroma

14. Tell the place where ATP is made
Tell the place H+ ions build up as electrons move down the electron transport chain
Tell the place where ATP is made
In thylakoid space inside sac
stroma

15. pigment Chlorophyll a Chlorophyll b
A _________________ is a molecule (like chlorophyll) that absorbs light energy.
Name the two types of chlorophyll
________________ & _________________
pigment
Chlorophyll a
Chlorophyll b

16. Name the cells unique to C4 plants where
the Calvin cycle is found
Name the two stages of photosynthesis
In which of these are carbohydrates produced?
Bundle sheath cells
Light reactions & Calvin cycle
Calvin cycle

17. The Calvin cycle is also referred to as the
____________________ reactions
Name the carrier of high energy electrons and hydrogen used during photosynthesis
In which stage of photosynthesis is ATP made?
Light independent
NADP+
Light dependent reactions

18. In which phase of photosynthesis is oxygen released to the atmosphere?
What is the ultimate fate of the H in H2O during photosynthesis?
ATP synthase uses the movement of which ion across the membrane to produce ATP?
Light reactions
Ends up in carbohydrates H+

19. Write the overall equation for photosynthesis.
What is the ultimate fate of the oxygen atoms in H2O following photosynthesis?
Write the overall equation for photosynthesis.
Released into the atmosphere as O2 gas
6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2

20. From which reactant do the Oxygen atoms in glucose (C6H12O6) come?
Where do the electrons that pass down the electron transport chain end up following non-cyclic electron flow?
Name the products of the light reaction.
Carbon dioxide
In NADPH
Oxygen, ATP, NADPH

21. Name the products of the Calvin cycle
In the light reactions, what is the electron donor?
Where do the electrons end up?
G3P (carbohydrates) , CO2
Campbell Concept check 10.2
water
NADP+
Campbell Concept check 10.2

22. Explain why a poison that inhibits an enzyme in the Calvin cycle will also inhibit the light reactions.
Explain when photorespiration would happen in a plant instead of photosynthesis.
Campbell Concept check 10.3
Light reactions require ADP and NADP+ which are regenerated from the Calvin cycle. If these don’t return from Calvin Cycle ATP and NADPH production stops
When it is hot & dry the plant closes its stomata to conserve water; when CO2 levels get low the plant switches to photorespiration

23. How is photorespiration different from photosynthesis?
In C4 plants the steps of carbon fixation and Calvin cycle are separated by location in different types of cells. How are these separated in CAM plants?
Rubisco adds O2 to Calvin cycle instead of CO2 ; CO2 is given off, but no ATP is made; no sugar is made
By time; carbon fixation happens at night, then
Calvin cycle uses the stored carbon during the day

24. How many G3P molecules are needed to make 1 glucose molecule?
G3P stands for __________________________
Give an example of a C3 plant 2
Glyceraldehyde-3-phosphate
Rice, wheat, soybeans, most flowers & trees you know

25. → Which of the following is a chlorophyll molecule?
Chlorophyll phospholipid glucose
amino acid (phenylalanine) ATP

26. Organisms that can produce their own food are called __________________
RuBP stands for __________________________
Give an example of a C4 plant
Autotrophs (producers)
Ribulose biphosphate
Sugarcane, corn

27. Organisms that can’t produce their own food and must get their energy from eating other organisms are called __________________
Which of the following sequences correctly represents the flow of electrons during photosynthesis? A) NADPH → O2→CO2 B) H2O →NADPH→ Calvin cycle C) NADPH→chlorophyll→ Calvin cycle D) H2O→photosystem I→photosystem II
E) NADPH→ electron transport chain → O2
heterotrophs (consumers) →
Campbell Self quiz

28. The most abundant protein in chloroplasts and probably the most abundant protein on Earth is ____________________
Which wavelengths of light does chlorophyll absorb best?
The entire range of electromagnetic radiation from microwaves to radiowaves is called the __________________________
rubisco
Red & blue violet
Electromagnetic spectrum

29. Chloroplasts are found mainly in which kind of cells in C3 plants
Which of the following sequences correctly represents the flow of electrons during photosynthesis? A) NADPH → O2→CO2 B) H2O →NADPH→ Calvin cycle C) NADPH→chlorophyll→ Calvin cycle D) H2O→photosystem I→photosystem II
E) NADPH→ electron transport chain → O2
mesophyll →
Campbell Self quiz