Question 1

Which of the following wavelengths of light would you expect to be reflected or transmitted by chlorophyll a?

Accepted Answer

A) blue 
B) green 
C) yellow 
D) red 
A) blue 
B) green 
C) yellow 
D) red B

Question 2

Photosystem II

Accepted Answer

A) receives electrons from photosystem I. 
B) passes electrons to photosystem I. 
C) does not have a reaction center. 
D) releases CO₂ as a by-product. 
A) receives electrons from photosystem I. 
B) passes electrons to photosystem I. 
C) does not have a reaction center. 
D) releases CO₂ as a by-product. B

Question 3

In most green plants, chloroplasts are

Accepted Answer

A) concentrated in a zone of leaf tissue called the mesophyll. 
B) concentrated in a portion of the leaf called the stroma. 
C) evenly distributed throughout the leaf tissue. 
D) evenly distributed throughout the entire plant. 
A) concentrated in a zone of leaf tissue called the mesophyll. 
B) concentrated in a portion of the leaf called the stroma. 
C) evenly distributed throughout the leaf tissue. 
D) evenly distributed throughout the entire plant. A

Question 4

Why are most plants green?

Accepted Answer

A) Chlorophyll a reflects green light. 
B) Chlorophyll a absorbs green light. 
C) Chlorophyll b primarily uses green light as the source of energy for photosynthesis. 
D) Green helps plants blend into their environment as a sort of camouflage. 
A) Chlorophyll a reflects green light. 
B) Chlorophyll a absorbs green light. 
C) Chlorophyll b primarily uses green light as the source of energy for photosynthesis. 
D) Green helps plants blend into their environment as a sort of camouflage.

Question 5

Ozone

Accepted Answer

A) formation is promoted by CFCs. 
B) is broken down by carbon dioxide. 
C) is a source of oxygen for cellular respiration. 
D) protects Earth from ultraviolet radiation. 
A) formation is promoted by CFCs. 
B) is broken down by carbon dioxide. 
C) is a source of oxygen for cellular respiration. 
D) protects Earth from ultraviolet radiation.

Question 6

Global warming due to the greenhouse effect may be

Accepted Answer

A) moderated by photosynthesis, which removes carbon dioxide from the atmosphere. 
B) made worse by photosynthesis, which adds carbon dioxide to the atmosphere. 
C) reduced by the burning of fossil fuels, which removes oxygen from the atmosphere. 
D) of little concern, since it is part of the normal cycle for the planet. 
A) moderated by photosynthesis, which removes carbon dioxide from the atmosphere. 
B) made worse by photosynthesis, which adds carbon dioxide to the atmosphere. 
C) reduced by the burning of fossil fuels, which removes oxygen from the atmosphere. 
D) of little concern, since it is part of the normal cycle for the planet.

Question 7

Plant cells are protected from the harmful effects of excessive light energy and reactive oxidative molecules by

Accepted Answer

A) mitochondria. 
B) chlorophyll. 
C) carotenoids. 
D) ATP. 
A) mitochondria. 
B) chlorophyll. 
C) carotenoids. 
D) ATP.

Question 8

Many of the regions of the world where hunger is prevalent are also regions with hot and dry climates. What types of agricultural crops would you suggest that these regions attempt to grow?

Accepted Answer

A) C₃ plants, such as wheat and rice 
B) C₃ plants and C₄ plants, such as corn and sugarcane 
C) C₃ plants and CAM plants, such as prickly pear and pineapple 
D) C₄ plants and CAM plants 
A) C₃ plants, such as wheat and rice 
B) C₃ plants and C₄ plants, such as corn and sugarcane 
C) C₃ plants and CAM plants, such as prickly pear and pineapple 
D) C₄ plants and CAM plants

Question 9

You want to use radioactively labeled oxygen to trace carbon fixation in a plant. You should incorporate the radioactively labeled oxygen into

Accepted Answer

A) O₂. 
B) CO₂. 
C) H₂O. 
D) C₆H₁₂O₆. 
A) O₂. 
B) CO₂. 
C) H₂O. 
D) C₆H₁₂O₆.

Question 10

Which of the following molecules is a product of photosynthesis?

Accepted Answer

A) CO₂ and chlorophyll 
B) glucose and O₂ 
C) O₂ and CO₂ 
D) glucose and CO₂ 
A) CO₂ and chlorophyll 
B) glucose and O₂ 
C) O₂ and CO₂ 
D) glucose and CO₂

Question 11

It has been suggested that global warming could be halted by fertilizing the oceans to increase the growth of algae. How might this affect the greenhouse effect?

Accepted Answer

A) Algal photosynthesis would use up more CO₂, which traps heat. 
B) Algal photosynthesis would produce more O₂, which blocks light. 
C) Algal photosynthesis would be inhibited by the addition of fertilizer. 
D) Algae photosynthesis would use heat in place of photons. 
A) Algal photosynthesis would use up more CO₂, which traps heat. 
B) Algal photosynthesis would produce more O₂, which blocks light. 
C) Algal photosynthesis would be inhibited by the addition of fertilizer. 
D) Algae photosynthesis would use heat in place of photons.

Question 12

Which of the following has been a major source of ozone destruction over the past 50 years?

Accepted Answer

A) chlorofluorocarbons (CFCs) 
B) ethylene glycol (C₂H₆O₂) 
C) carbon dioxide (CO₂) 
D) methane (CH₄) 
A) chlorofluorocarbons (CFCs) 
B) ethylene glycol (C₂H₆O₂) 
C) carbon dioxide (CO₂) 
D) methane (CH₄)

Question 13

In photophosphorylation, energy from electron flow is used to transport ________ from the ________ to the thylakoid compartment, generating a concentration gradient of ________.

Accepted Answer

A) electrons; grana; H⁺ 
B) H⁺; grana; electrons 
C) H⁺; stroma; H⁺ 
D) H⁺; stroma; ATP 
A) electrons; grana; H⁺ 
B) H⁺; grana; electrons 
C) H⁺; stroma; H⁺ 
D) H⁺; stroma; ATP

Question 14

Which of the following statements about the absorption of photons by pigment molecules is true?

Accepted Answer

A) It takes several minutes for the pigment electrons to become excited. 
B) Photons raise electrons in pigments to the ground state. 
C) Excitation of the electrons is a very stable state. 
D) Energy can be released by the excited electron as heat, light, or fluorescence. 
A) It takes several minutes for the pigment electrons to become excited. 
B) Photons raise electrons in pigments to the ground state. 
C) Excitation of the electrons is a very stable state. 
D) Energy can be released by the excited electron as heat, light, or fluorescence.

Question 15

After reading the paragraph below, answer the questions that follow.
The graph below shows records of temperature (light gray line) and CO₂ (dark gray line) over the past 1,000 years. CO₂ is recorded in parts per million (ppm).
  
-If the trends shown in the graph continue, how might this affect photosynthesis?

Accepted Answer

A) Photorespiration may increase, leading to an increase in photosynthetic production of sugar. 
B) Photorespiration may increase, leading to a decrease in photosynthetic production of sugar. 
C) C₄ and CAM plants would be unable to photosynthesize. 
D) There would be no effect on photosynthesis, since CO₂ and temperature are stable. 
A) Photorespiration may increase, leading to an increase in photosynthetic production of sugar. 
B) Photorespiration may increase, leading to a decrease in photosynthetic production of sugar. 
C) C₄ and CAM plants would be unable to photosynthesize. 
D) There would be no effect on photosynthesis, since CO₂ and temperature are stable.

Question 16

As a result of the cascade of electrons down the electron transport chains of the light reactions,

Accepted Answer

A) NADPH is reduced to NADP⁺. 
B) NADPH is oxidized to NADP⁺. 
C) NADP⁺ is reduced to NADPH. 
D) NADP⁺ is oxidized to NADPH. 
A) NADPH is reduced to NADP⁺. 
B) NADPH is oxidized to NADP⁺. 
C) NADP⁺ is reduced to NADPH. 
D) NADP⁺ is oxidized to NADPH.

Question 17

Where is chlorophyll found in a plant cell?

Accepted Answer

A) stroma 
B) thylakoid membranes 
C) cytoplasm 
D) cristae 
A) stroma 
B) thylakoid membranes 
C) cytoplasm 
D) cristae

Question 18

Which of the following is an example of a photoautotroph?

Accepted Answer

A) algae in freshwater and marine ecosystems 
B) grizzly bears in Alaska 
C) bacteria in our mouth 
D) mushrooms growing on the side of a dead tree 
A) algae in freshwater and marine ecosystems 
B) grizzly bears in Alaska 
C) bacteria in our mouth 
D) mushrooms growing on the side of a dead tree

Question 19

Photosynthetic organisms derive their carbon from

Accepted Answer

A) carbon monoxide. 
B) carbon dioxide. 
C) hydrocarbons. 
D) methane. 
A) carbon monoxide. 
B) carbon dioxide. 
C) hydrocarbons. 
D) methane.

Question 20

Put the following steps of the light reactions in the correct order: 1. Light excites an electron from photosystem I.
2) Light excites an electron from photosystem II.
3) Electrons reduce NADP⁺ to NADPH.
4) Electrons pass through an electron transport chain, which generates a H⁺ gradient used to make ATP.

Accepted Answer

A) 1, 2, 3, 4 
B) 1, 4, 2, 3 
C) 2, 4, 1, 3 
D) 2, 3, 1, 4 
A) 1, 2, 3, 4 
B) 1, 4, 2, 3 
C) 2, 4, 1, 3 
D) 2, 3, 1, 4

Exam 7: Photosynthesis: Using Light to Make Food

Which of the following wavelengths of light would you expect to be reflected or transmitted by chlorophyll a?

Photosystem II

In most green plants, chloroplasts are

Why are most plants green?

Ozone

Global warming due to the greenhouse effect may be

Plant cells are protected from the harmful effects of excessive light energy and reactive oxidative molecules by

Many of the regions of the world where hunger is prevalent are also regions with hot and dry climates. What types of agricultural crops would you suggest that these regions attempt to grow?

You want to use radioactively labeled oxygen to trace carbon fixation in a plant. You should incorporate the radioactively labeled oxygen into

Which of the following molecules is a product of photosynthesis?

It has been suggested that global warming could be halted by fertilizing the oceans to increase the growth of algae. How might this affect the greenhouse effect?

Which of the following has been a major source of ozone destruction over the past 50 years?

In photophosphorylation, energy from electron flow is used to transport ________ from the ________ to the thylakoid compartment, generating a concentration gradient of ________.

Which of the following statements about the absorption of photons by pigment molecules is true?

As a result of the cascade of electrons down the electron transport chains of the light reactions,

Where is chlorophyll found in a plant cell?

Which of the following is an example of a photoautotroph?

Photosynthetic organisms derive their carbon from

Biology: Exploring Life

The Chemical Basis of Life

The Molecules of Cells

A Tour of the Cell

The Working Cell

How Cells Harvest Chemical Energy

The Cellular Basis of Reproduction and Inheritance

Patterns of Inheritance

Molecular Biology of the Gene

How Genes Are Controlled

DNA Technology and Genomics

How Populations Evolve

The Origin of Species

Tracing Evolutionary History

Microbial Life: Prokaryotes and Protists

The Evolution of Plant and Fungal Diversity

The Evolution of Invertebrate Diversity

The Evolution of Vertebrate Diversity

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Gas Exchange

Circulation

the Immune System

Control of Body Temperature and Water Balance

Hormones and the Endocrine System

Reproduction and Embryonic Development

Nervous Systems

the Senses

How Animals Move

Plant Structure, Growth, and Reproduction

Plant Nutrition and Transport

Control Systems in Plants

the Biosphere: an Introduction to Earths Diverse Environments

Behavioral Adaptations to the Environment

Population Ecology

Communities and Ecosystems

Conservation Biology

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In photophosphorylation, energy from electron flow is used to transport from the to the thylakoid compartment, generating a concentration gradient of .