Photosynthesis and Consumer Organisms Quiz

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What is the major site of photosynthesis in most plants?

Stems
Flowers
Roots
Leaves (correct)

Which organisms utilize the energy of sunlight to make organic molecules from H2O and CO2?

Purple sulfur bacteria
Cyanobacteria (correct)
Fungi
Animals

What is the function of phycobilisomes in cyanobacteria?

Facilitate respiration
Store carbon dioxide
Convert light energy to chemical energy
Absorb sunlight for photosynthesis (correct)

Which prokaryotic organism has a thylakoid membrane with phycobilisomes attached to it?

Purple sulfur bacteria (B) Signup and view all the answers

How many chloroplasts are there approximately per square millimeter of leaf surface?

50,000 (C) Signup and view all the answers

Where does photosynthesis occur in cyanobacteria?

Thylakoids (B) Signup and view all the answers

What generates the proton (H+) gradient in the linear flow of electrons?

Splitting of water by PS II (D) Signup and view all the answers

What drives ATP synthesis in the stroma during the linear flow of electrons?

Diffusion of H+ through ATP synthase (C) Signup and view all the answers

In the cyclic flow of electrons, what happens when no NADP+ is returned from the Calvin cycle?

High energy electrons shunt into an alternate pathway (A) Signup and view all the answers

What do light reactions primarily generate?

NADPH and ATP (A) Signup and view all the answers

What is the main function of the Calvin cycle?

Builds sugar from smaller molecules (C) Signup and view all the answers

Is the Calvin cycle primarily anabolic or catabolic?

Anabolic (D) Signup and view all the answers

What is the main purpose of the Calvin cycle?

Convert CO2 to sugar (B) Signup and view all the answers

In the Calvin cycle, what is the function of RUBISCO?

Catalyze the addition of CO2 to RuBP (A) Signup and view all the answers

How many molecules of G3P are produced in the Calvin cycle?

1 (C) Signup and view all the answers

Which enzyme is responsible for the conversion of CO2 to sugar in the Calvin cycle?

RUBISCO (B) Signup and view all the answers

What is the product of the initial step in the Calvin cycle where CO2 is added to RuBP?

6-carbon molecule (A) Signup and view all the answers

How is G3P produced in the Calvin cycle?

Through phosphorylation of 3-PGA using NADPH (A) Signup and view all the answers

What happens to P700 when it gets excited by light energy?

It becomes oxidized (P700+) (B) Signup and view all the answers

What is the role of the enzyme NADP+ reductase in the linear electron flow?

Catalyzes the transfer of electrons to NADP+ (B) Signup and view all the answers

What is the function of the second electron transport chain after PSI in linear electron flow?

Reduces NADPH to NADP+ (A) Signup and view all the answers

How many electrons are required for the reduction of NADP+ to NADPH?

Two electrons (A) Signup and view all the answers

Which process contributes to the generation of the H+ gradient in the stroma during linear electron flow?

Removal of an H+ atom (B) Signup and view all the answers

What is the main difference between the second electron transport chain after PSI and the primary electron acceptor of PS I?

One transfers electrons without creating a proton gradient (B) Signup and view all the answers

How many molecules of G3P are produced for every six triose phosphate molecules?

5 molecules of G3P (C) Signup and view all the answers

What is the main role of Ribulose biphosphate (RuBP) in the Calvin cycle?

Regenerate RuBP (A) Signup and view all the answers

How many steps in the Calvin cycle are dedicated to the regeneration of RuBP?

12 steps (B) Signup and view all the answers

What is the purpose of fixing CO2 in the Calvin cycle?

Synthesize glucose and other sugars (B) Signup and view all the answers

How many CO2 molecules need to be fixed in the Calvin cycle to produce a molecule of glucose?

9 molecules of CO2 (C) Signup and view all the answers