Question 1

Which of the following membrane proteins tend to lack hydrophobic regions on their surfaces?

Accepted Answer

A) transmembrane proteins 
B) integral membrane proteins 
C) peripheral membrane proteins 
D) integrins 
A) transmembrane proteins 
B) integral membrane proteins 
C) peripheral membrane proteins 
D) integrins

Question 2

The cytoplasmic side of a cell membrane is negative in charge relative to the extracellular side.What is the voltage across a cell membrane called?

Accepted Answer

A) water potential 
B) chemical gradient 
C) membrane potential 
D) osmotic potential 
E) electrochemical gradient 
A) water potential 
B) chemical gradient 
C) membrane potential 
D) osmotic potential 
E) electrochemical gradient

Question 3

Thinking about the environments where plant and animal cells typically exist,which of the following statements is correct?

Accepted Answer

A) Animal cells are generally in a hypotonic solution,and plant cells are generally in an isotonic solution. 
B) Animal cells are generally in an isotonic solution,and plant cells are generally in a hypotonic solution. 
C) Animal cells are generally in an isotonic solution,and plant cells are generally in a hypertonic solution. 
D) Animal cell are generally in a hypertonic solution,and plant cells are generally in an isotonic solution. 
E) Animal cells are generally in a hypertonic solution,and plant cells are generally in a hypotonic solution. 
A) Animal cells are generally in a hypotonic solution,and plant cells are generally in an isotonic solution. 
B) Animal cells are generally in an isotonic solution,and plant cells are generally in a hypotonic solution. 
C) Animal cells are generally in an isotonic solution,and plant cells are generally in a hypertonic solution. 
D) Animal cell are generally in a hypertonic solution,and plant cells are generally in an isotonic solution. 
E) Animal cells are generally in a hypertonic solution,and plant cells are generally in a hypotonic solution.

Question 4

Which of the following evolutionary adaptations would you expect to find in the cell membranes of Antarctic icefish?

Accepted Answer

A) a high percentage of very long chain saturated fatty acids 
B) no cholesterol 
C) a high percentage of unsaturated fatty acids 
D) a high percentage of carbohydrates on membrane lipids 
A) a high percentage of very long chain saturated fatty acids 
B) no cholesterol 
C) a high percentage of unsaturated fatty acids 
D) a high percentage of carbohydrates on membrane lipids

Question 5

An accident victim has lost a lot of blood due to a serious injury.Replacement of the lost body fluids with distilled water would have which of the following results?

Accepted Answer

A) It will have no unfavorable effect as long as the water is free of viruses and bacteria. 
B) The patient's red blood cells will shrivel up because the blood fluid has become hypotonic compared to the cells. 
C) The patient's red blood cells will swell and lyse because the blood fluid has become hypotonic compared to the cells. 
D) The patient's red blood cells will shrivel up because the blood fluid has become hypertonic compared to the cells. 
A) It will have no unfavorable effect as long as the water is free of viruses and bacteria. 
B) The patient's red blood cells will shrivel up because the blood fluid has become hypotonic compared to the cells. 
C) The patient's red blood cells will swell and lyse because the blood fluid has become hypotonic compared to the cells. 
D) The patient's red blood cells will shrivel up because the blood fluid has become hypertonic compared to the cells.

Question 6

The rate of diffusion of glucose through artificial phospholipid bilayers is exceptionally low.By contrast,the cells lining the small intestine rapidly transport large quantities of glucose from glucose-rich food into their glucose-poor cytoplasm.Based on this information,which transport mechanism is most likely responsible for glucose transport in the intestinal cells?

Accepted Answer

A) simple diffusion 
B) phagocytosis 
C) active transport pumps 
D) facilitated diffusion 
A) simple diffusion 
B) phagocytosis 
C) active transport pumps 
D) facilitated diffusion

Exam 5: Membrane Transport and Cell Signaling

Which of the following membrane proteins tend to lack hydrophobic regions on their surfaces?

The cytoplasmic side of a cell membrane is negative in charge relative to the extracellular side.What is the voltage across a cell membrane called?

Thinking about the environments where plant and animal cells typically exist,which of the following statements is correct?

Which of the following evolutionary adaptations would you expect to find in the cell membranes of Antarctic icefish?

An accident victim has lost a lot of blood due to a serious injury.Replacement of the lost body fluids with distilled water would have which of the following results?

Introduction: Evolution and the Foundations of Biology

The Chemical Context of Life

Carbon and the Molecular Diversity of Life

A Tour of the Cell

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

Development,stem Cells,and Cancer

Viruses

Genomes and Their Evolution

Descent With Modification

Phylogeny

The Evolution of Populations

The Origin of Species

Broad Patterns of Evolution

Early Life and the Diversification of Prokaryotes

The Origin and Diversification of Eukaryotes

The Colonization of Land by Plants and Fungi

The Rise of Animal Diversity

Plant Structure and Growth

Resource Acquisition,nutrition,and Transport in Vascular Plants

Reproduction and Domestication of Flowering Plants

Plant Responses to Internal and External Signals

Homeostasis and Endocrine Signaling

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Reproduction and Development

Neurons,synapses,and Signaling

Nervous and Sensory Systems

Motor Mechanisms and Behavior

Population Ecology and the Distribution of Organisms

Ecological Communities

Ecosystems and Energy

Conservation Biology and Global Change

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