Question 1

Which molecule associated with photorespiration is toxic to plant cells?

Accepted Answer

A) phosphoglycolate 
B) 3PGA 
C) glycolate 
D) G3P 
A) phosphoglycolate 
B) 3PGA 
C) glycolate 
D) G3P

Question 2

Consider the chemical reaction for photosynthesis as a redox reaction. Which of the following is reduced/oxidized?

Accepted Answer

A) Carbon dioxide is reduced to glucose and water is oxidized to oxygen. 
B) Carbon dioxide is oxidized to glucose and water is reduced to oxygen. 
C) Carbon dioxide is reduced to oxygen and water is oxidized to glucose. 
D) Carbon dioxide is oxidized to oxygen and water is reduced to glucose. 
A) Carbon dioxide is reduced to glucose and water is oxidized to oxygen. 
B) Carbon dioxide is oxidized to glucose and water is reduced to oxygen. 
C) Carbon dioxide is reduced to oxygen and water is oxidized to glucose. 
D) Carbon dioxide is oxidized to oxygen and water is reduced to glucose.

Question 3

Match the name of the process to its description.
-This form of the light-dependent reactions produces ATP and NADPH in equal molar ratios.

Accepted Answer

A) noncyclic electron flow 
B) cyclic electron flow 
C) carbon fixation stage of the Calvin cycle 
D) carbon reduction stage of Calvin cycle 
E) RuBP regeneration stage of Calvin cycle 
A) noncyclic electron flow 
B) cyclic electron flow 
C) carbon fixation stage of the Calvin cycle 
D) carbon reduction stage of Calvin cycle 
E) RuBP regeneration stage of Calvin cycle

Question 4

For each phrase, choose the most appropriate process.
-requires G3P to continue

Accepted Answer

A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle 
A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle

Question 5

Match each term with its definition.
-photorespiration

Accepted Answer

A) the generation of ATP via a proton gradient created by light-energized electrons moving down an electron transport chain 
B) the site of the light-independent reactions in the chloroplast 
C) complexes of light-absorbing molecules clustered in the thylakoid and stromal membranes of chloroplasts 
D) membranous connections between granum that allow individual thylakoid lumens to form a single, contiguous compartment 
E) the addition of O2 to RuBP by rubisco, resulting in a net loss of carbon from the Calvin cycle
F)the molecule used to store carbon overnight in CAM plants
G)organisms that use CO2 as their carbon source and light as their energy source 
A) the generation of ATP via a proton gradient created by light-energized electrons moving down an electron transport chain 
B) the site of the light-independent reactions in the chloroplast 
C) complexes of light-absorbing molecules clustered in the thylakoid and stromal membranes of chloroplasts 
D) membranous connections between granum that allow individual thylakoid lumens to form a single, contiguous compartment 
E) the addition of O2 to RuBP by rubisco, resulting in a net loss of carbon from the Calvin cycle
F)the molecule used to store carbon overnight in CAM plants
G)organisms that use CO2 as their carbon source and light as their energy source

Question 6

For each phrase, choose the most appropriate process.
-produces NADP+

Accepted Answer

A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle 
A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle

Question 7

Not all plants can use the C4 pathway to avoid photorespiration.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following best describes the difference between autotrophs and photoautotrophs?

Accepted Answer

A) Autotrophs produce their own food, and photoautotrophs use the energy from light to covert CO2 into an organic form. 
B) Autotrophs do not produce their own food, and photoautotrophs do. 
C) Autotrophs produce their own food, and photoautotrophs do not. 
D) Autotrophs produce their own food, and photoautotrophs use the energy from chemicals to covert CO2 into an organic form. 
A) Autotrophs produce their own food, and photoautotrophs use the energy from light to covert CO2 into an organic form. 
B) Autotrophs do not produce their own food, and photoautotrophs do. 
C) Autotrophs produce their own food, and photoautotrophs do not. 
D) Autotrophs produce their own food, and photoautotrophs use the energy from chemicals to covert CO2 into an organic form.

Question 9

For each phrase, choose the most appropriate process.
-consumes O2

Accepted Answer

A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle 
A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle

Question 10

Match each term with its definition.
-stroma

Accepted Answer

A) the generation of ATP via a proton gradient created by light-energized electrons moving down an electron transport chain 
B) the site of the light-independent reactions in the chloroplast 
C) complexes of light-absorbing molecules clustered in the thylakoid and stromal membranes of chloroplasts 
D) membranous connections between granum that allow individual thylakoid lumens to form a single, contiguous compartment 
E) the addition of O2 to RuBP by rubisco, resulting in a net loss of carbon from the Calvin cycle
F)the molecule used to store carbon overnight in CAM plants
G)organisms that use CO2 as their carbon source and light as their energy source 
A) the generation of ATP via a proton gradient created by light-energized electrons moving down an electron transport chain 
B) the site of the light-independent reactions in the chloroplast 
C) complexes of light-absorbing molecules clustered in the thylakoid and stromal membranes of chloroplasts 
D) membranous connections between granum that allow individual thylakoid lumens to form a single, contiguous compartment 
E) the addition of O2 to RuBP by rubisco, resulting in a net loss of carbon from the Calvin cycle
F)the molecule used to store carbon overnight in CAM plants
G)organisms that use CO2 as their carbon source and light as their energy source

Question 11

Which of the following is light absorbed by in photosynthesis?

Accepted Answer

A) green pigments called chlorophylls and blue pigments called carotenoids 
B) green pigments called carotenoids and yellow-orange pigments called chlorophylls 
C) green pigments called chlorophylls and red-orange pigments called carotenoids 
D) green pigments called chlorophylls and yellow-orange pigments called carotenoids 
A) green pigments called chlorophylls and blue pigments called carotenoids 
B) green pigments called carotenoids and yellow-orange pigments called chlorophylls 
C) green pigments called chlorophylls and red-orange pigments called carotenoids 
D) green pigments called chlorophylls and yellow-orange pigments called carotenoids

Question 12

When does a CAM plant take in atmospheric CO2?

Accepted Answer

A) from noon to midnight 
B) in darkness only 
C) in daylight only 
D) from midnight to noon 
A) from noon to midnight 
B) in darkness only 
C) in daylight only 
D) from midnight to noon

Question 13

Match the terms and descriptions with the correct labelled part in the following illustration. A labelled part may be used once, more than once, or not at all.  
-where photorespiration occurs

Accepted Answer

The answer of Match the terms and descriptions with the...

Question 14

Which of the following absorb the photons of light in photosynthesis?

Accepted Answer

A) chlorophyll and carotenoids 
B) chlorophyll and the thylakoid membrane 
C) carotenoids and the stroma 
D) the thylakoid membrane and the stroma 
A) chlorophyll and carotenoids 
B) chlorophyll and the thylakoid membrane 
C) carotenoids and the stroma 
D) the thylakoid membrane and the stroma

Question 15

For each phrase, choose the most appropriate process.
-produces ADP

Accepted Answer

A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle 
A) light-dependent reactions only 
B) Calvin cycle only 
C) light-dependent reactions and the Calvin cycle both 
D) neither the light-dependent reactions nor the Calvin cycle

Question 16

Why is photorespiration more likely to occur in warm weather?

Accepted Answer

A) Plants require warm weather (at least 23º
C)  to drive photosynthesis. 
B) Plants are more likely to close their stomata in the daytime heat than at night when it is cool. 
C) Plants are more likely to dehydrate in warm weather, forcing them to close their stomata to conserve water; this prevents CO2 from entering the leaf. 
D) The rubisco enzyme is very temperature-sensitive and becomes less selective in warmer temperatures, allowing it to fix O2 instead of CO2. 
A) Plants require warm weather (at least 23º
C)  to drive photosynthesis. 
B) Plants are more likely to close their stomata in the daytime heat than at night when it is cool. 
C) Plants are more likely to dehydrate in warm weather, forcing them to close their stomata to conserve water; this prevents CO2 from entering the leaf. 
D) The rubisco enzyme is very temperature-sensitive and becomes less selective in warmer temperatures, allowing it to fix O2 instead of CO2.

Question 17

Which Calvin cycle products are used in the light reactions?

Accepted Answer

A) G3P, ATP, and NADPH 
B) electrons from CO2 
C) ADP, Pi, and NADP+ 
D) O2, water, and ATP 
A) G3P, ATP, and NADPH 
B) electrons from CO2 
C) ADP, Pi, and NADP+ 
D) O2, water, and ATP

Question 18

What is the reason why we call "fossil fuels" as such?

Accepted Answer

A) They are the remnants of fuels. 
B) They are the remnants of fossils. 
C) They are the remnants of ancient forests. 
D) They are the remnants of modern forests. 
A) They are the remnants of fuels. 
B) They are the remnants of fossils. 
C) They are the remnants of ancient forests. 
D) They are the remnants of modern forests.

Question 19

If chloroplasts are put in the dark, what must they be provided with in order to continue making sugar?

Accepted Answer

A) CO2 and ATP 
B) NADPH and ATP 
C) NADPH, ATP, and CO2 
D) NADPH, CO2, and ADP 
A) CO2 and ATP 
B) NADPH and ATP 
C) NADPH, ATP, and CO2 
D) NADPH, CO2, and ADP

Question 20

Explain why it is important, from a global standpoint, to try to improve the efficiency of photosynthesis in common crops. Specify which aspect(s) of photosynthesis we should target.

Accepted Answer

The land available for agriculture is li

Exam 7: Photosynthesis

Which molecule associated with photorespiration is toxic to plant cells?

Consider the chemical reaction for photosynthesis as a redox reaction. Which of the following is reduced/oxidized?

Match the name of the process to its description. -This form of the light-dependent reactions produces ATP and NADPH in equal molar ratios.

For each phrase, choose the most appropriate process. -requires G3P to continue

Match each term with its definition. -photorespiration

For each phrase, choose the most appropriate process. -produces NADP+

Not all plants can use the C4 pathway to avoid photorespiration.

Which of the following best describes the difference between autotrophs and photoautotrophs?

For each phrase, choose the most appropriate process. -consumes O2

Match each term with its definition. -stroma

Which of the following is light absorbed by in photosynthesis?

When does a CAM plant take in atmospheric CO2?

Match the terms and descriptions with the correct labelled part in the following illustration. A labelled part may be used once, more than once, or not at all. -where photorespiration occurs

Which of the following absorb the photons of light in photosynthesis?

For each phrase, choose the most appropriate process. -produces ADP

Why is photorespiration more likely to occur in warm weather?

Which Calvin cycle products are used in the light reactions?

What is the reason why we call "fossil fuels" as such?

If chloroplasts are put in the dark, what must they be provided with in order to continue making sugar?

Explain why it is important, from a global standpoint, to try to improve the efficiency of photosynthesis in common crops. Specify which aspect(s) of photosynthesis we should target.

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Cell Cycles

Genetic Recombination

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

Dna Structure, Replication, and Organization

Gene Structure and Expression

Control of Gene Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Muscles, Skeletons, and Body Movements

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

Filters

For each phrase, choose the most appropriate process. -produces NADP⁺

For each phrase, choose the most appropriate process. -consumes O₂

When does a CAM plant take in atmospheric CO₂?