photosynthesis

Question 1

NAD+

Answer 1

• an electron carrier / co-enzyme
• functions as an oxidizing agent during respiration

Question 2

Regeneration in dark reactions

Answer 2

6 ATP are used to convert 10 PGAL to RuBP (ribulose biphosphate)

Question 3

Reduction in a dark reaction

Answer 3

12 ATP and 12 NADPH are used to convert 12 PGA to 12 PGAL

Question 4

Carboxylation in dark reactions

Answer 4

6CO2 combine with RuBP (ribulose biphosphate) to produce 12 PGA

Question 5

Noncyclic Phosphorylation

Answer 5

Takes lights energy and electrons from H20 to make energy-rich molecules and NADPH

Question 6

7 steps for Non cyclic Photo phosphorylation

Answer 6

1) Photosystem II
2) Primary Electron acceptor
3) Electron Transport Chain
4) Phosphorylation
5) Photosystem 1
6) NADPH
7) Photolysis

Question 7

In autotrophic eukaryotes …

Answer 7

Photosynthesis occurs in thylakoids

Question 8

Photosynthesis is summarized as

Answer 8

6CO2 + 12 H20 + Light Energy —> C6H12O6 + 6O2 +6 H2O

Question 9

Chloroplasts split water into

Answer 9

Hydrogen and Oxygen , incorporating the electrons of hydrogen into sugar molecules

Question 10

Photosynthesis is a redox process where …

Answer 10

H2O is oxidized (loses an electron)
CO2 is reduced (gains electron

Question 11

What reaction in the thylakoid membrane split water releasing O2 , producing ATP , and forming NADPH

Answer 11

Light reactions

Question 12

Where does the Calvin Cycle (dark reactions) take place ?

Answer 12

In the stroma

Question 13

A photosystem is …

Answer 13

Composed of a reaction-center complex surrounded by light-harvesting complexes the funnel energy of phototons to the reaction center complex

Question 14

What happens in the primary electron acceptor ?

Answer 14

• a special pair of reaction center chlorophyll a molecules absorbs energy
• one of its electrons is boosted to a higher energy level and sent to he primary electron acceptor

Question 15

How many chlorophyll a molecules are in the reaction-center complex in photosystem ll

Answer 15

P680

Question 16

How many chlorophyll a molecules are in the reaction-center complex in photosystem l

Answer 16

P700

Question 17

Linear electron flow during light reactions and uses …

Answer 17

both photosystems and produces NADPH , ATP , and oxygen

Question 18

what happens during chemiosmosis

Answer 18

both mitochondria and chloroplasts electron transport chain generate an H+ (proton) gradient across a membrane . ATP synthase uses this proton-motive force to synthesize ATP

Question 19

The light reactions of photosynthesis supply the Calvin Cycle with …

Answer 19

ATP and NADPH

Question 20

What represents the flow of electrons during photosynthesis ?

Answer 20

H20 –> NADPH –> Calvin cycle

Question 21

How is photosynthesis similar in C4 plants and CAM plants ?

Answer 21

In both cases rubisico is not used to fix carbon initially

Question 22

What is the correct distinction between autotrophs and heterotrophs ?

Answer 22

Autotrophs but not heterotrophs can nourish themselves beginning with CO2 and other inorganic nutrients

Question 23

What does NOT happen during the Calvin cycle ?

Answer 23

release of oxygen

Question 24

In mechanism , phosphorylation is most similar to

Answer 24

Oxidative phosphorylation in cellular respiration

Question 25

Which process is most directly driven by light energy ?

Answer 25

The removal of electrons from chlorophyll molecules