Question 1

Which of the following statements in relation to viral replication is INCORRECT?

Accepted Answer

A)  Viruses may mix their genetic material to produce new combinations. 
B)  Viral genes can incorporate into a host's genome and remain dormant for extended periods. 
C)  In mixed infections, viral genomes may recombine. 
D)  Viruses reproduce asexually. 
E)  Viral replication is uniform in nature. 
A)  Viruses may mix their genetic material to produce new combinations. 
B)  Viral genes can incorporate into a host's genome and remain dormant for extended periods. 
C)  In mixed infections, viral genomes may recombine. 
D)  Viruses reproduce asexually. 
E)  Viral replication is uniform in nature.

Question 2

Why is there no universal phylogenetic tree joining all viruses, like those that exist for other organisms?

Accepted Answer

A)  Because viruses are not organisms 
B)  Many viruses remain uncharacterised, meaning not enough data has been collated to produce such a tree 
C)  Because the diseases they cause are so varied, they are difficult to classify 
D)  There is no single gene shared by all viruses 
E)  Many viruses do not have dsDNA genomes, therefore very few have true genes from which to build a phylogenetic tree 
A)  Because viruses are not organisms 
B)  Many viruses remain uncharacterised, meaning not enough data has been collated to produce such a tree 
C)  Because the diseases they cause are so varied, they are difficult to classify 
D)  There is no single gene shared by all viruses 
E)  Many viruses do not have dsDNA genomes, therefore very few have true genes from which to build a phylogenetic tree

Question 3

In a retrovirus, what is the role of the reverse transcriptase enzyme?

Accepted Answer

A)  Transcribes ssRNA into dsDNA 
B)  Transcribes ssDNA into dsDNA 
C)  Transcribes dsDNA into ssRNA 
D)  The direct translation of viral genomic material into protein 
E)  It converts host transcripts into viral genome virions 
A)  Transcribes ssRNA into dsDNA 
B)  Transcribes ssDNA into dsDNA 
C)  Transcribes dsDNA into ssRNA 
D)  The direct translation of viral genomic material into protein 
E)  It converts host transcripts into viral genome virions

Question 4

When a retrovirus infects a suitable host cell, what is transcribed to produce progeny ssRNA genomes?

Accepted Answer

A)  ssDNA 
B)  dsDNA 
C)  ssRNA 
D)  dsRNA 
E)  ssRNA and/or ssDNA 
A)  ssDNA 
B)  dsDNA 
C)  ssRNA 
D)  dsRNA 
E)  ssRNA and/or ssDNA

Question 5

How are satellite nucleic acids transmitted?

Accepted Answer

A)  Via a living vector 
B)  By droplet transmission 
C)  Satellite nucleic acids are not contagious and therefore not transmitted 
D)  Within the genome of a helper virus 
E)  Within the virions of a helper virus 
A)  Via a living vector 
B)  By droplet transmission 
C)  Satellite nucleic acids are not contagious and therefore not transmitted 
D)  Within the genome of a helper virus 
E)  Within the virions of a helper virus

Exam 14: Viruses

Which of the following statements in relation to viral replication is INCORRECT?

Why is there no universal phylogenetic tree joining all viruses, like those that exist for other organisms?

In a retrovirus, what is the role of the reverse transcriptase enzyme?

When a retrovirus infects a suitable host cell, what is transcribed to produce progeny ssRNA genomes?

How are satellite nucleic acids transmitted?

Nature of Molecules

Biomolecules

The Chemistry of Life

Functioning Cells

Movement Across Membranes

Harvesting Energy

Cells, Tissues and Signals

Cell Division

Inheritance

Genes, Chromosomes and Dna

The Genetic Code

Gene Expression

Genomes, Mutation and Cancer

Genetic Engineering and Biotechnology

Reproduction, Growth and Development of Flowering Plants

Structure of Plants

Plant Nutrition, Transport and Adaptation to Stress

Plant Hormones and Growth Responses

Animal Reproduction

Animal Development

Homeostasis: Water, Solutes and Excretion

Gas Exchange in Animals

Circulation

Metabolism, Temperature Regulation and Environmental Stress

Animal and Human Nutrition

Innate Defences and the Immune System

Hormonal Control in Animals

Nervous Systems

Animal Movement

Animal Behaviour

Evolving Life

Evolving Earth

Mechanisms of Evolution

Bacteria

The Protists

Plants

Fungi

Simple Animals: Sponges to Flatworms

Annelids, Molluscs, Nematodes and Arthropods

Echinoderms and Chordates

Australian Biota

Population Ecology

Living in Communities

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