Question 1

Which of the following best describes the role of photoautotrophs in an ecosystem?

Accepted Answer

They use light energy to produce organic molecules from inorganic raw materials.

Question 2

In the process of photosynthesis, which molecule acts as the final electron acceptor in the light reactions?

Accepted Answer

NADP$$^+$$

Question 3

Chloroplasts contain stacks of membrane-bound sacs called _______. These stacks are essential for the light-dependent reactions of photosynthesis.

Accepted Answer

grana

Question 4

During the Calvin cycle, which of the following steps directly incorporates atmospheric CO$$_2$$ into an organic molecule?

Accepted Answer

Carbon fixation

Question 5

Where in the chloroplast is chlorophyll primarily located?

Accepted Answer

Thylakoid membranes

Question 6

The oxygen released during photosynthesis comes from the splitting of which molecule?

Accepted Answer

H$$_2O$$

Question 7

Which of the following is NOT a direct product of the light-dependent reactions of photosynthesis?

Accepted Answer

Glucose

Question 8

Sunlight is considered which type of energy?

Accepted Answer

Electromagnetic

Question 9

The full range of electromagnetic energy is called the _______ spectrum.

Accepted Answer

Electromagnetic

Question 10

In most green plants, chloroplasts are concentrated in which part of the leaf?

Accepted Answer

Mesophyll

Question 11

In the electron transport chain of photosynthesis, how do H$$^+$$ ions move from the stroma to the thylakoid interior?

Accepted Answer

Through an electron transport chain molecule

Question 12

Which of the following pigments can be found at the photosystem reaction center?

Accepted Answer

Chlorophyll a

Question 13

The energy that excites the photosystems is supplied by:

Accepted Answer

Photons

Question 14

Which of the following is a direct product of photosystem II?

Accepted Answer

O$$_2$$

Question 15

ATP and NADPH produced during the light reactions are used for:

Accepted Answer

Glucose synthesis in the Calvin cycle

Question 16

The enzyme ATP synthase in chloroplasts functions to:

Accepted Answer

Transport H$$^+$$ ions from the thylakoid space to the stroma

Question 17

Plants use sugars produced in photosynthesis for all of the following EXCEPT:

Accepted Answer

A source of electrons for chemiosmosis

Question 18

The Calvin cycle constructs ________, an energy-rich molecule that a plant cell can then use to make glucose or other organic molecules.

Accepted Answer

G3P

Question 19

Photorespiration occurs when rubisco binds to ________ instead of CO$$_2.$$

Accepted Answer

O$$_2$$

Question 20

Which of the following statements about the greenhouse effect is true?

Accepted Answer

The greenhouse effect is exacerbated by the use of fossil fuels.

Photosynthesis and Plant Cell Biology: Study Guide

Study Guide - Practice Questions