Photosynthesis

Question 1

What occurs during light independent-reactions?

Answer 1

RuBP reacts with CO2 to form a 6C compound

Question 2

Which of the following properties can affect the absorption of light by a pigment like chlorophyll?

Answer 2

The color of the pigment

Question 3

During the light-dependent reactions, which option is an immediate consequence of the absorption of photons by the photosystem?

Answer 3

The excitation of electrons

Question 4

What is the main advantage of using free-air carbon dioxide enrichment experiments (FACE) over enclosed greenhouse experiments to study the effects of elevated CO2 on photosynthesis?

Answer 4

They simulate real-world conditions more accurately, allowing for a better understanding of the effects of elevated CO2 on plants.

Question 5

What is the main difference between absorption and action spectra?

Answer 5

Action spectra show the wavelengths of light that activate photosynthesis, absorption spectra display the wavelengths of light absorbed by a pigment.

Question 6

Which of the following enzymes is involved in the light-dependent reactions?

Answer 6

ATP synthase

Question 7

Which of the following is responsible for ATP production by chemiosmosis in thylakoids?

Answer 7

Electron Transport Chain

Question 8

Where are photosystem arrays, such as photosystem II, embedded?

Answer 8

In the plasma membrane of chloroplasts

Question 9

Name the process that generates electrons for use in the light-dependent reactions.

Answer 9

Photolysis

Question 10

What happens in the light-dependent reactions of photosynthesis?

Answer 10

A proton gradient is generated in the thylakoid space.

Question 11

What is needed in order to regenerate RuBP?

Answer 11

Phosphate groups

Question 12

Which of the following is not true about light-dependent reactions?

Answer 12

Takes place in the stroma

Question 13

Which of the following best describes the relationship between the light-dependent and light-independent reactions in photosynthesis?

Answer 13

The light-dependent reactions produce ATP and NADPH, which are used to power the light-independent reactions.

Question 14

How does exercise affect the ventilation rate?

Answer 14

Increase in CO2 increases breathing rate.

Question 15

Which statement is an inaccurate representation of chromatography?

Answer 15

Although both have the same type of stationary phase, thin layer chromatography uses a different principle than paper chromatography.

Question 16

What is an advantage of different arrangements of pigment molecules in a photosystem within a leaf?

Answer 16

An increased probability of capturing light energy

Question 17

Which of the following is an important enzyme involved in the fixation of carbon dioxide?

Answer 17

Rubisco

Question 18

Which of the following processes is not part of the light-dependent reactions?

Answer 18

Carbon fixation

Question 19

Name one product of the light-dependent reactions which is not needed for the light-independent reactions.

Answer 19

Oxygen

Question 20

Which molecule is reduced by photosystem I during photosynthesis?

Answer 20

NADP+

Question 21

Which of the following equations represents photolysis?

Answer 21

2H2O + photons → 4e– + 4H+ + O2

Question 22

The energy absorbed by chlorophyll is used directly for what in plants?

Answer 22

To produce ATP
To split water

Question 23

Which of the following equations represents photosynthesis?

Answer 23

6CO2 + 6H2O → C6H12O6 + 6O2

Question 24

From which molecule(s) is oxygen released into the air as a product of photosynthesis?

Answer 24

Water

Question 25

Which type of light is least useful for photosynthesis in terrestrial plants?

Answer 25

Green

Question 26

What is required for mitochondrial ATP production?

Answer 26

Accumulation of proton gradient in the intermembrane space