BIO 214: Chap 8: Photosynthesis

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

Chloroplasts

What two main products result from photosynthesis?

Sugars/carbohydrates and oxygen

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

Stroma

Which statement about thylakoids in eukaryotes is not correct?

Thylakoids exist as a maze of folded membranes

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

ATP NADPH accumulation

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

They both store energy in chemical bonds

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

ATP synthase

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

2

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

Photosystem 2

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

Photosystem 1

Three of the same species of plant are grown under a different colored light for the same amount of time. Plant A is grown under blue light, Plant B is grown uner 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?

A, C, B

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?

Blue light irradiated plants

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

CO2

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

RuBP + CO2 → [RuBisCO] 3-PGA → G3P

Where in eukaryotic cells does the Calvin cycle take place?

Chloroplast stroma

Which statement correctly describes carbon fixation?

The conversion of CO2 into an organic compound

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?

8 G3P, 1 G3P exported

On a hot, dry day, the guard cells of plants close their stomata to conserve water. What impact will this have on photosynthesis?

Levels of carbon dioxide (a necessary photosynthetic substrate)will immediately fall. As a result, the rate of photosynthesis will be inhibited.

Which of the following statements is true?

In photosynthesis, water and carbon dioxide are reactants. G3P and oxygen are products.

What is the initial survey of electrons for the chloroplast electron transport chain?

Water

What is the overall outcome of the light reactions in photosynthesis?

The outcome of light reactions in photosynthesis is the conversion of solar energy into chemical energy that the chloroplasts can use to do work (mostly anabolic production of carbohydrates from carbon dioxide).