BI234 EXERCISE 5 EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS GRADED A+
In what ways do viruses differ from other pathogens?
viruses lack cytoplasm & organelles
Double stranded RNA genomes can be found
only in viruses
The outermost layer of a virion fulfills which of the following functions of the
virus?
both protection & recognition
A _________ is a virus that infects bacterial cells
bacteriophage
Which of the following is a characteristic by which viruses are classified?
type of nucleic acid
Host specificity of a virus is due to
interactions between viral & cellular surface molecules
Which of the following is primarily responsible for the shape of a virion?
the capsid
How are fungal viruses different from viruses that infect other organisms?
they have no extracellular state
Some viruses have a dsDNA genome. Others may have a ________ genome.
ssDNA, ssRNA, or dsRNA
, Which of the following is CORRECT regarding the viral envelope?
it is composed of cellular phospholipid membrane, cellular & viral proteins
A lipid membrane is present in which of the following?
enveloped viruses
What is a virion?
a single virus genome inside a cell
Which of the following lists stages of a lytic replication cycle in order, from
earliest to latest stages?
I. Synthesis
II. Assembly
III. Attachment
IV. Release
V. Entry
III, V, I, II, IV
Which of the following is associated with the attachment of a bacteriophage to a
bacterial cell?
random collisions, chemical attractions, & receptor specificity
A________ is a bacterial virus which is integrated into the host cell DNA.
prophage
Which of the following events occurs in the lytic cycle of bacteriophage T4
infection but not in the lysogenic cycle?
digestion of host DNA
Why is lysogen advantageous to a bacteriophage?
WITH COMPLETE SOLUTIONS GRADED A+
In what ways do viruses differ from other pathogens?
viruses lack cytoplasm & organelles
Double stranded RNA genomes can be found
only in viruses
The outermost layer of a virion fulfills which of the following functions of the
virus?
both protection & recognition
A _________ is a virus that infects bacterial cells
bacteriophage
Which of the following is a characteristic by which viruses are classified?
type of nucleic acid
Host specificity of a virus is due to
interactions between viral & cellular surface molecules
Which of the following is primarily responsible for the shape of a virion?
the capsid
How are fungal viruses different from viruses that infect other organisms?
they have no extracellular state
Some viruses have a dsDNA genome. Others may have a ________ genome.
ssDNA, ssRNA, or dsRNA
, Which of the following is CORRECT regarding the viral envelope?
it is composed of cellular phospholipid membrane, cellular & viral proteins
A lipid membrane is present in which of the following?
enveloped viruses
What is a virion?
a single virus genome inside a cell
Which of the following lists stages of a lytic replication cycle in order, from
earliest to latest stages?
I. Synthesis
II. Assembly
III. Attachment
IV. Release
V. Entry
III, V, I, II, IV
Which of the following is associated with the attachment of a bacteriophage to a
bacterial cell?
random collisions, chemical attractions, & receptor specificity
A________ is a bacterial virus which is integrated into the host cell DNA.
prophage
Which of the following events occurs in the lytic cycle of bacteriophage T4
infection but not in the lysogenic cycle?
digestion of host DNA
Why is lysogen advantageous to a bacteriophage?
