Chapter 13 Characterizing and Classifying Viruses, Viroids,
and Prions || Solved Accurately 100%.
Which of the following is an accurate description of a virion?
A) the nucleic acid of a viral pathogen
B) an infectious particle of protein and nucleic acid outside a host cell
C) a population of infectious particles
D) the protein portion of a viral particle
E) the nucleic acid of a viral pathogen inside a host cell correct answers Answer: B
The outermost layer of a virion fulfills which of the following functions of the virus?
A) protection
B) recognition
C) replication
D) both protection and recognition
E) both recognition and replication correct answers Answer: D
A ________ is a virus that infects bacterial cells.
A) virion
B) prion
C) bacteriophage
D) nucleocapsid
E) viroid correct answers Answer: C
Which of the following is present in cells only during virus infection?
A) dsDNA
B) ssRNA
C) ssDNA
D) DNA-RNA heteroduplex
E) triplet RNA correct answers Answer: C
Host specificity of a virus is due to
A) particular genes that it shares with the infected cell.
B) the presence of an envelope.
C) differences in size between the virus and the host cell.
D) the presence or absence of a cell wall on the host cell.
E) interactions between viral and cellular surface molecules. correct answers Answer: E
The shape of a virion is a function of the ________ of the virus.
A) size of the genome material
B) cell type of the host cell
C) type of genome material
D) capsid
E) envelope correct answers Answer: D
How are fungal viruses different from viruses that infect other organisms?
A) They have no extracellular state.
B) They have only DNA for genetic material.
C) They have no capsid.
, D) They have no intracellular state.
E) They cannot pass through a filter. correct answers Answer: A
The envelope portion of an enveloped virus is composed of
A) glycolipids of the host cell.
B) virus-encoded glycoproteins.
C) phospholipids from host cell membranes.
D) host cell membranes containing virus-encoded glycoproteins.
E) host glycolipids and virus-encoded glycoproteins. correct answers Answer: D
Which of the following may occur in a lysogenic infection, but NOT a latent one?
A) The inserted viral DNA may leave the host DNA.
B) The viral DNA integrates (inserts) into the host cell DNA.
C) The provirus/prophage directs the synthesis of viral proteins.
D) The prophage/provirus alters gene expression in the host cell.
E) The prophage/provirus is replicated with the host DNA. correct answers Answer: A
Which of the following statements regarding virus taxonomy is TRUE?
A) Viruses are classified on the basis of the taxonomy of their host organisms.
B) Virus classes are well established.
C) Some virus family names are derived from the name of an important member of the
family.
D) The species epithet is a Latin descriptor of the virion structure.
E) Virus classes are based on the domain of the host organism. correct answers Answer: C
Classification of viruses includes
A) classes.
B) orders.
C) families.
D) orders and families.
E) classes, orders, and families. correct answers Answer: D
What is the correct order for the stages of a lytic replication cycle, from earliest to latest
stages?
I. Synthesis
II. Assembly
III. Attachment
IV. Release
V. Entry
A) III, V, I, II, IV
B) III, II, V, I, IV
C) V, III, II, IV, I
D) I, III, V, II, IV
E) I, II, III, V, IV correct answers Answer: A
Which of the following is involved in the attachment of a bacteriophage to a bacterial cell?
A) random collisions
B) chemical attractions
C) receptor specificity
D) both chemical attractions and receptor specificity
and Prions || Solved Accurately 100%.
Which of the following is an accurate description of a virion?
A) the nucleic acid of a viral pathogen
B) an infectious particle of protein and nucleic acid outside a host cell
C) a population of infectious particles
D) the protein portion of a viral particle
E) the nucleic acid of a viral pathogen inside a host cell correct answers Answer: B
The outermost layer of a virion fulfills which of the following functions of the virus?
A) protection
B) recognition
C) replication
D) both protection and recognition
E) both recognition and replication correct answers Answer: D
A ________ is a virus that infects bacterial cells.
A) virion
B) prion
C) bacteriophage
D) nucleocapsid
E) viroid correct answers Answer: C
Which of the following is present in cells only during virus infection?
A) dsDNA
B) ssRNA
C) ssDNA
D) DNA-RNA heteroduplex
E) triplet RNA correct answers Answer: C
Host specificity of a virus is due to
A) particular genes that it shares with the infected cell.
B) the presence of an envelope.
C) differences in size between the virus and the host cell.
D) the presence or absence of a cell wall on the host cell.
E) interactions between viral and cellular surface molecules. correct answers Answer: E
The shape of a virion is a function of the ________ of the virus.
A) size of the genome material
B) cell type of the host cell
C) type of genome material
D) capsid
E) envelope correct answers Answer: D
How are fungal viruses different from viruses that infect other organisms?
A) They have no extracellular state.
B) They have only DNA for genetic material.
C) They have no capsid.
, D) They have no intracellular state.
E) They cannot pass through a filter. correct answers Answer: A
The envelope portion of an enveloped virus is composed of
A) glycolipids of the host cell.
B) virus-encoded glycoproteins.
C) phospholipids from host cell membranes.
D) host cell membranes containing virus-encoded glycoproteins.
E) host glycolipids and virus-encoded glycoproteins. correct answers Answer: D
Which of the following may occur in a lysogenic infection, but NOT a latent one?
A) The inserted viral DNA may leave the host DNA.
B) The viral DNA integrates (inserts) into the host cell DNA.
C) The provirus/prophage directs the synthesis of viral proteins.
D) The prophage/provirus alters gene expression in the host cell.
E) The prophage/provirus is replicated with the host DNA. correct answers Answer: A
Which of the following statements regarding virus taxonomy is TRUE?
A) Viruses are classified on the basis of the taxonomy of their host organisms.
B) Virus classes are well established.
C) Some virus family names are derived from the name of an important member of the
family.
D) The species epithet is a Latin descriptor of the virion structure.
E) Virus classes are based on the domain of the host organism. correct answers Answer: C
Classification of viruses includes
A) classes.
B) orders.
C) families.
D) orders and families.
E) classes, orders, and families. correct answers Answer: D
What is the correct order for the stages of a lytic replication cycle, from earliest to latest
stages?
I. Synthesis
II. Assembly
III. Attachment
IV. Release
V. Entry
A) III, V, I, II, IV
B) III, II, V, I, IV
C) V, III, II, IV, I
D) I, III, V, II, IV
E) I, II, III, V, IV correct answers Answer: A
Which of the following is involved in the attachment of a bacteriophage to a bacterial cell?
A) random collisions
B) chemical attractions
C) receptor specificity
D) both chemical attractions and receptor specificity
