Review Questions

Which of the following components is not used by both plants and cyanobacteria to carry out photosynthesis?

1. chloroplasts
2. chlorophyll
3. carbon dioxide
4. water

What two main products result from photosynthesis?

1. oxygen and carbon dioxide
2. chlorophyll and oxygen
3. sugars/carbohydrates and oxygen
4. sugars/carbohydrates and carbon dioxide

In which compartment of the plant cell do the light-independent reactions of photosynthesis take place?

1. thylakoid
2. stroma
3. outer membrane
4. mesophyll

Which statement about thylakoids in eukaryotes is not correct?

1. Thylakoids are assembled into stacks.
2. Thylakoids exist as a maze of folded membranes.
3. The space surrounding thylakoids is called stroma.
4. Thylakoids contain chlorophyll.

Predict the end result if a chloroplast’s light-independent enzymes developed a mutation that prevented them from activating in response to light.

1. G3P accumulation
2. ATP and NADPH accumulation
3. Water accumulation
4. Carbon dioxide depletion

How are the NADPH and G3P molecules made during photosynthesis similar?

1. They are both end products of photosynthesis.
2. They are both substrates for photosynthesis.
3. They are both produced from carbon dioxide.
4. They both store energy in chemical bonds.

Which of the following structures is not a component of a photosystem?

1. ATP synthase
2. antenna molecule
3. reaction center
4. primary electron acceptor

How many photons does it take to fully reduce one molecule of NADP⁺ to NADPH?

1. 1
2. 2
3. 4
4. 8

Which complex is not involved in the establishment of conditions for ATP synthesis?

1. photosystem I
2. ATP synthase
3. photosystem II
4. cytochrome complex

From which component of the light-dependent reactions does NADPH form most directly?

1. photosystem II
2. photosystem I
3. cytochrome complex
4. ATP synthase

Three of the same species of plant are each grown under a different colored light for the same amount of time. Plant A is grown under blue light, Plant B is grown under green light, and Plant C is grown under orange light. Assuming the plants use only chlorophyll a and chlorophyll b for photosynthesis, what would be the predicted order of the plants from most growth to least growth?

1. A, C, B
2. A, B, C
3. C, A, B
4. B, A, C

Plants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm (x-rays), 450nm (blue light), 670nm (red light), and 800nm (infrared light). Which plants harness the most energy for photosynthesis?

1. X-ray irradiated plants
2. Blue light irradiated plants
3. Red light irradiated plants
4. Infrared irradiated plants

Which molecule must enter the Calvin cycle continually for the light-independent reactions to take place?

1. RuBisCO
2. RuBP
3. 3-PGA
4. CO₂

Which order of molecular conversions is correct for the Calvin cycle?

1. RuBP + G3P → 3-PGA → sugar
2. RuBisCO → CO2 → RuBP → G3P
3. RuBP + CO2 → [RuBisCO] 3-PGA → G3P
4. CO2 → 3-PGA → RuBP → G3P

Where in eukaryotic cells does the Calvin cycle take place?

1. thylakoid membrane
2. thylakoid lumen
3. chloroplast stroma
4. granum

Which statement correctly describes carbon fixation?

1. the conversion of CO₂ into an organic compound
2. the use of RuBisCO to form 3-PGA
3. the production of carbohydrate molecules from G3P
4. the formation of RuBP from G3P molecules
5. the use of ATP and NADPH to reduce CO₂

If four molecules of carbon dioxide enter the Calvin cycle (four “turns” of the cycle), how many G3P molecules are produced and how many are exported?

1. 4 G3P made, 1 G3P exported
2. 4 G3P made, 2 G3P exported
3. 8 G3P made, 1 G3P exported
4. 8 G3P made, 4 G3P exported