Question 1

Viruses are characterized by all of the following except

Accepted Answer

A) being found in every organism investigated so far. 
B) being specific to the hosts they infect. 
C) being capable of independent reproduction. 
D) having either a helical or isometric structure. 
E) being acellular. 
A) being found in every organism investigated so far. 
B) being specific to the hosts they infect. 
C) being capable of independent reproduction. 
D) having either a helical or isometric structure. 
E) being acellular.

Question 2

Which matching of HIV drug therapy and proposed mode of action is incorrect?

Accepted Answer

A) AZT-blocks viral replication 
B) protease inhibitor-inhibitor of reverse transcriptase 
C) defective nef gene-incorporation into a vaccine 
D) chemokines-block HIV binding to CD4+ cells 
E) CAF-block viral replication 
A) AZT-blocks viral replication 
B) protease inhibitor-inhibitor of reverse transcriptase 
C) defective nef gene-incorporation into a vaccine 
D) chemokines-block HIV binding to CD4+ cells 
E) CAF-block viral replication

Question 3

If a virus enters the lytic phase in a host's cell,it will cause

Accepted Answer

A) the host cell to reject the virus. 
B) the host cell to shrink because of the loss of cytoplasm that has been used in the synthesis of viral DNA. 
C) the host cell to burst because there will be so many viral particles present. 
D) the host cell to replicate itself at a higher than normal frequency. 
E) the host cell to initiate an attack on the virus. 
A) the host cell to reject the virus. 
B) the host cell to shrink because of the loss of cytoplasm that has been used in the synthesis of viral DNA. 
C) the host cell to burst because there will be so many viral particles present. 
D) the host cell to replicate itself at a higher than normal frequency. 
E) the host cell to initiate an attack on the virus.

Question 4

Which of the following statements about emerging viruses is false?

Accepted Answer

A) Emerging viruses are able to "jump" from one species to another. 
B) Hantavirus,which causes a hemorrhagic-type fever,originates in deer mice. 
C) Ebola is an emerging virus of unknown origins that can have a mortality rate in excess of 50%. 
D) The emerging virus SARS is a completely new form of corona virus. 
E) The stable genome of the SARS virus makes it an unlikely candidate for vaccine development. 
A) Emerging viruses are able to "jump" from one species to another. 
B) Hantavirus,which causes a hemorrhagic-type fever,originates in deer mice. 
C) Ebola is an emerging virus of unknown origins that can have a mortality rate in excess of 50%. 
D) The emerging virus SARS is a completely new form of corona virus. 
E) The stable genome of the SARS virus makes it an unlikely candidate for vaccine development.

Question 5

Mad cow disease is caused by a

Accepted Answer

A) bacterium. 
B) virus. 
C) viroid. 
D) virion. 
E) prion. 
A) bacterium. 
B) virus. 
C) viroid. 
D) virion. 
E) prion.

Question 6

Isometric viruses are _________ in basic structure,which contains 20 equilateral triangular surfaces.

Accepted Answer

The answer of Isometric viruses are _________ in basic structure,which...

Question 7

HIV studies revealed that it is closely related to

Accepted Answer

A) smallpox virus. 
B) ebola virus. 
C) herpes virus. 
D) a chimpanzee virus. 
E) mad cow diseasE. 
A) smallpox virus. 
B) ebola virus. 
C) herpes virus. 
D) a chimpanzee virus. 
E) mad cow diseasE.

Question 8

All of the following are diseases caused by viruses except

Accepted Answer

A) strep throat. 
B) AIDS. 
C) polio. 
D) small pox. 
E) measles. 
A) strep throat. 
B) AIDS. 
C) polio. 
D) small pox. 
E) measles.

Question 9

HIV infects cells by recognizing the cell-surface markers with its own

Accepted Answer

A) DNA. 
B) glycoproteins. 
C) reverse transcriptase. 
D) capsid protein. 
E) enzymes. 
A) DNA. 
B) glycoproteins. 
C) reverse transcriptase. 
D) capsid protein. 
E) enzymes.

Question 10

The HIV virus is considered a(n)______ virus,because after getting integrated into the host cell chromosomes,it does not begin replicating immediately.

Accepted Answer

A) phage 
B) latent 
C) transforming 
D) benign 
E) inducible 
A) phage 
B) latent 
C) transforming 
D) benign 
E) inducible

Question 11

Choose the letter of the best match from the following:
-Infectious protein.

Accepted Answer

A) virion 
B) viroid 
C) virus 
D) prion 
E) phage 
A) virion 
B) viroid 
C) virus 
D) prion 
E) phage

Question 12

While they are simple relative to cells,viruses often have a very diverse collection of components.Which one of the following choices is least likely to be found as part of a virus?

Accepted Answer

A) proteins with functional binding sites 
B) membrane components 
C) single-stranded DNA 
D) ribosomes 
E) glycoproteins 
A) proteins with functional binding sites 
B) membrane components 
C) single-stranded DNA 
D) ribosomes 
E) glycoproteins

Question 13

A scientist is investigating the lytic cycle of the T4 phage virus.This means she is examining the

Accepted Answer

A) method used by the T4 phage to kill a bacterial cell. 
B) method used by the T4 phage to replicate proteins. 
C) method used by the T4 phage to replicate its DNA. 
D) method used by the T4 phage to enter a eukaryotic cell. 
E) method used by the T4 phage to begin protein synthesis on the bacterium's ribosomE. 
A) method used by the T4 phage to kill a bacterial cell. 
B) method used by the T4 phage to replicate proteins. 
C) method used by the T4 phage to replicate its DNA. 
D) method used by the T4 phage to enter a eukaryotic cell. 
E) method used by the T4 phage to begin protein synthesis on the bacterium's ribosomE.

Question 14

Which of the following is a unique feature of viruses that separates them from bacteria?

Accepted Answer

A) They are generally smaller. 
B) They are often highly toxic. 
C) They lack proteins. 
D) They have different nucleotides in their hereditary material. 
E) They cannot exist outside of a host cell. 
A) They are generally smaller. 
B) They are often highly toxic. 
C) They lack proteins. 
D) They have different nucleotides in their hereditary material. 
E) They cannot exist outside of a host cell.

Question 15

Viruses that become established as stable parts of the host cell genome are called

Accepted Answer

A) lethal. 
B) potent. 
C) temperate. 
D) virulent. 
E) latent. 
A) lethal. 
B) potent. 
C) temperate. 
D) virulent. 
E) latent.

Question 16

Which of the following would not be a component of a newly produced HIV virus?

Accepted Answer

A) protein capsid 
B) RNA 
C) reverse transcriptase 
D) viral envelope 
E) complementary DNA 
A) protein capsid 
B) RNA 
C) reverse transcriptase 
D) viral envelope 
E) complementary DNA

Question 17

Virulent viruses multiply within infected cells and eventually

Accepted Answer

A) cause an alternation of generations in the host cell,releasing new viruses. 
B) cause the transformation of the host cell,releasing new viruses. 
C) cause lysis of the host cell,releasing new viruses. 
D) cause the transduction of the host cell,releasing new viruses. 
E) cause a transfer of material from the host cell,releasing new viruses. 
A) cause an alternation of generations in the host cell,releasing new viruses. 
B) cause the transformation of the host cell,releasing new viruses. 
C) cause lysis of the host cell,releasing new viruses. 
D) cause the transduction of the host cell,releasing new viruses. 
E) cause a transfer of material from the host cell,releasing new viruses.

Question 18

Which of the following statements about the types and subtypes of the influenza (flu)virus is false?

Accepted Answer

A) Of the three major types of flu virus (A,B,and 
C) ,only Type A can occur in humans,other mammals,and birds. 
B) Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus. 
C) The A(H2N2)and the A(H3N2)strains of the virus require different vaccines. 
D) High mutation rates create more diversity in strains of flu than does genetic recombination. 
E) Genetic recombination between flu strains from different species is common. 
A) Of the three major types of flu virus (A,B,and 
C) ,only Type A can occur in humans,other mammals,and birds. 
B) Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus. 
C) The A(H2N2)and the A(H3N2)strains of the virus require different vaccines. 
D) High mutation rates create more diversity in strains of flu than does genetic recombination. 
E) Genetic recombination between flu strains from different species is common.

Question 19

The viruses that infect bacteria are called ____________.

Accepted Answer

The answer of The viruses that infect bacteria are called...

Question 20

Viruses can ________ only after they have entered a host cell,and only by using the host's cellular machinery.

Accepted Answer

The answer of Viruses can ________ only after they have...

Exam 27: Viruses

Viruses are characterized by all of the following except

Which matching of HIV drug therapy and proposed mode of action is incorrect?

If a virus enters the lytic phase in a host's cell,it will cause

Which of the following statements about emerging viruses is false?

Mad cow disease is caused by a

Isometric viruses are _________ in basic structure,which contains 20 equilateral triangular surfaces.

HIV studies revealed that it is closely related to

All of the following are diseases caused by viruses except

HIV infects cells by recognizing the cell-surface markers with its own

The HIV virus is considered a(n)______ virus,because after getting integrated into the host cell chromosomes,it does not begin replicating immediately.

Choose the letter of the best match from the following: -Infectious protein.

While they are simple relative to cells,viruses often have a very diverse collection of components.Which one of the following choices is least likely to be found as part of a virus?

A scientist is investigating the lytic cycle of the T4 phage virus.This means she is examining the

Which of the following is a unique feature of viruses that separates them from bacteria?

Viruses that become established as stable parts of the host cell genome are called

Which of the following would not be a component of a newly produced HIV virus?

Virulent viruses multiply within infected cells and eventually

Which of the following statements about the types and subtypes of the influenza (flu)virus is false?

The viruses that infect bacteria are called ____________.

Viruses can ________ only after they have entered a host cell,and only by using the host's cellular machinery.

The Science of Biology

The Nature of Molecules

The Chemical Building Blocks of Life

Cell Structure

Membranes

Energy and Metabolism

How Cells Harvest Energy

Photosynthesis

Cell Communication

How Cells Divide

Sexual Reproduction and Meiosis

Patterns of Inheritance

Chromosomes Mapping and the Meiosis - Inheritance Connection

Dna: the Genetic Material

Genes and How They Work

Control of Gene Expression

Biotechnology

Genomics

Cellular Mechanisms of Development

Genes Within Populations

The Evidence for Evolution

The Origin of Species

Systematics and the Phylogenetic Revolution

Genome Evolution

Evolution of Development

The Tree of Life

Prokaryotes

Protists

Overview of Green Plants

Fungi

Overview of Animal Diversity

Noncoelomate Invertebrates

Coelomate Invertebrates

Vertebrates

Plant Form

Vegetative Plant Development

Transport in Plants

Plant Nutrition and Soils

Plant Defense Responses

Sensory Systems in Plants

Plant Reproduction

The Animal Body and Principles of Regulation

The Nervous System

Sensory Systems

The Endocrine System

The Musculoskeletal System

The Digestive System

The Respiratory System

The Circulatory System

Osmotic Regulation and the Urinary System

The Immune System

The Reproductive System

Animal Development

Behavioral Biology

Population Ecology

Community of Ecology

Dynamics of Ecosystems

The Biosphere

Conservation Biology