Question 1

In autumn, chlorophyll is degraded in the leaves of deciduous trees. Why do the leaves change color to shades of yellow, orange, or red?

Accepted Answer

A)  Sugars from sap fill the leaves prior to winter. 
B)  Degraded chlorophyll changes into many other colors. 
C)  In the absence of photosynthesis, the leaves produce energy exclusively by aerobic cellular respiration. 
D)  Other pigments such as carotenoids are still present in the leaves. 
A)  Sugars from sap fill the leaves prior to winter. 
B)  Degraded chlorophyll changes into many other colors. 
C)  In the absence of photosynthesis, the leaves produce energy exclusively by aerobic cellular respiration. 
D)  Other pigments such as carotenoids are still present in the leaves.

Question 2

Which of the following molecules are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

Accepted Answer

A)  CO₂ and glucose 
B)  H₂O and O₂ 
C)  ADP,   ᵢ,and NADP⁺ 
D)  ATP and NADPH 
A)  CO₂ and glucose 
B)  H₂O and O₂ 
C)  ADP,   ᵢ,and NADP⁺ 
D)  ATP and NADPH

Question 3

Use the following figure to answer the question.
 
Which of the following statements is true concerning the accompanying figure?

Accepted Answer

A)  It represents a C₄ photosynthetic system. 
B)  It represents an adaptation that maximizes photorespiration. 
C)  It represents a C₃ photosynthetic system. 
D)  It represents a CAM photosynthetic system. 
A)  It represents a C₄ photosynthetic system. 
B)  It represents an adaptation that maximizes photorespiration. 
C)  It represents a C₃ photosynthetic system. 
D)  It represents a CAM photosynthetic system.

Question 4

What would be a likely consequence of a mutation in plants that results in a photorespiration deficiency?

Accepted Answer

A)  Photosynthetic efficiency would be reduced at low light intensities. 
B)  Cells would carry on the Calvin cycle at a much slower rate. 
C)  There would be more cellular damage from harmful products of the light reactions of photosynthesis. 
D)  Less oxygen would be produced by photosynthesis. 
A)  Photosynthetic efficiency would be reduced at low light intensities. 
B)  Cells would carry on the Calvin cycle at a much slower rate. 
C)  There would be more cellular damage from harmful products of the light reactions of photosynthesis. 
D)  Less oxygen would be produced by photosynthesis.

Question 5

CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they ________.

Accepted Answer

A)  fix CO₂ into organic acids during the night 
B)  fix CO₂ into sugars in the bundle-sheath cells 
C)  fix CO₂ into pyruvate in the mesophyll cells 
D)  use photosystem I and photosystem II at night 
A)  fix CO₂ into organic acids during the night 
B)  fix CO₂ into sugars in the bundle-sheath cells 
C)  fix CO₂ into pyruvate in the mesophyll cells 
D)  use photosystem I and photosystem II at night

Exam 10: Photosynthesis

In autumn, chlorophyll is degraded in the leaves of deciduous trees. Why do the leaves change color to shades of yellow, orange, or red?

Which of the following molecules are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

Use the following figure to answer the question. Which of the following statements is true concerning the accompanying figure?

What would be a likely consequence of a mutation in plants that results in a photorespiration deficiency?

CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they ________.

Evolution, the Themes of Biology, and Scientific Inquiry

The Chemical Context of Life

Water and Life

Carbon and the Molecular Diversity of Life

The Structure and Function of Large Biological Molecules

A Tour of the Cell

Membrane Structure and Function

An Introduction to Metabolism

Cellular Respiration and Fermentation

Cell Communication

The Cell Cycle

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Chromosomal Basis of Inheritance

The Molecular Basis of Inheritance

Gene Expression: From Gene to Protein

Regulation of Gene Expression

Viruses

DNA Tools and Biotechnology

Genomes and Their Evolution

Descent with Modification: A Darwinian View of Life

The Evolution of Populations

The Origin of Species

The History of Life on Earth

Phylogeny and the Tree of Life

Bacteria and Archaea

Protists

Plant Diversity I: How Plants Colonized Land

Plant Diversity II: The Evolution of Seed Plants

Fungi

An Overview of Animal Diversity

An Introduction to Invertebrates

The Origin and Evolution of Vertebrates

Vascular Plant Structure, Growth, and Development

Resource Acquisition and Transport in Vascular Plants

Soil and Plant Nutrition

Angiosperm Reproduction and Biotechnology

Plant Responses to Internal and External Signals

Basic Principles of Animal Form and Function

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Osmoregulation and Excretion

Hormones and the Endocrine System

Animal Reproduction

Animal Development

Neurons, Synapses, and Signaling

Nervous Systems

Sensory and Motor Mechanisms

Animal Behavior

An Introduction to Ecology and the Biosphere

Population Ecology

Community Ecology

Ecosystems and Restoration Ecology

Conservation Biology and Global Change

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