Question 1

If an adult person has a faulty version of the human analog to ced-4 of the nematode, which of the following is most likely to result?

Accepted Answer

A)  activation of a developmental pathway found in the worm but not in humans 
B)  a form of cancer in which there is insufficient apoptosis 
C)  formation of molecular pores in the mitochondrial outer membrane 
D)  excess skin loss 
A)  activation of a developmental pathway found in the worm but not in humans 
B)  a form of cancer in which there is insufficient apoptosis 
C)  formation of molecular pores in the mitochondrial outer membrane 
D)  excess skin loss

Question 2

Yeast cells of mating type a are genetically engineered to produce only mating factor α instead of the normal mating factor a. The gene for the mating factor receptor was unaltered. How will these engineered cells behave in terms of mating?

Accepted Answer

A)  They will only mate with normal mating type a cells. 
B)  They will only mate with normal mating type α cells. 
C)  They will mate with each other or with normal mating type a cells, but not with normal mating type α cells. 
D)  They will only mate each other and not with normal mating type a or α cells. 
A)  They will only mate with normal mating type a cells. 
B)  They will only mate with normal mating type α cells. 
C)  They will mate with each other or with normal mating type a cells, but not with normal mating type α cells. 
D)  They will only mate each other and not with normal mating type a or α cells.

Question 3

Sutherland discovered that the signaling molecule epinephrine is responsible for which of the following events?

Accepted Answer

A)  Stimulating glycogen synthesis. 
B)  Decreasing blood glucose levels. 
C)  Interacting directly with glycogen phosphorylase. 
D)  Elevating cytosolic concentrations of cyclic AMP. 
A)  Stimulating glycogen synthesis. 
B)  Decreasing blood glucose levels. 
C)  Interacting directly with glycogen phosphorylase. 
D)  Elevating cytosolic concentrations of cyclic AMP.

Question 4

Which of the following results would most likely be an immediate result of a growth factor binding to its receptor?

Accepted Answer

A)  protein kinase activity 
B)  adenylyl cyclase activity 
C)  cAMP activity 
D)  phosphorylase activity 
A)  protein kinase activity 
B)  adenylyl cyclase activity 
C)  cAMP activity 
D)  phosphorylase activity

Question 5

What role do phosphatases play in signal transduction pathways?

Accepted Answer

A)  They transfer a phosphate group from one protein in the pathway to the next molecule in the series. 
B)  They activate protein kinases by phosphorylation. 
C)  They amplify the second messenger cAMP. 
D)  They inactivate protein kinases to turn off signal transduction. 
A)  They transfer a phosphate group from one protein in the pathway to the next molecule in the series. 
B)  They activate protein kinases by phosphorylation. 
C)  They amplify the second messenger cAMP. 
D)  They inactivate protein kinases to turn off signal transduction.

Exam 11: Cell Communication

If an adult person has a faulty version of the human analog to ced-4 of the nematode, which of the following is most likely to result?

Yeast cells of mating type a are genetically engineered to produce only mating factor α instead of the normal mating factor a. The gene for the mating factor receptor was unaltered. How will these engineered cells behave in terms of mating?

Sutherland discovered that the signaling molecule epinephrine is responsible for which of the following events?

Which of the following results would most likely be an immediate result of a growth factor binding to its receptor?

What role do phosphatases play in signal transduction pathways?

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

Photosynthesis

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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