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University of Houston MICRO 3332 Quiz 5 1)Which of the following is generally not part of the life cycle of a lytic phage? a

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University of Houston

MICRO 3332

Quiz 5

1)Which of the following is generally not part of the life cycle of a lytic phage?

a.            The progeny phage formed inside the cell lyse the host cell

b.            The entire phage enters the host bacterial cell

c.             Many copies of phage DNA are made

d.            The phage DNA is transcribed, and the resulting mRNA is translated to make capsid proteins

e.            All of the above steps are part of the life cycle of a lytic phage

2.            In a filamentous virus, the pattern of capsid monomers forms a(n)          tube around the genome

a.            Icosahedral

b.            Filamentous

c.             Asymmetrical

d.            Complex

e.            Helical

3.            Genes for the capsid proteins are found in the

a.            Plasmid

b.            Bacterial chromosome

c.             Viral envelope

d.            Ribosome

e.            Viral genome

4.            A(n)       phage may integrate its genome into that of the host cell

a.            Lytic

b.            Temperate

c.             Viroid

d.            Asymmetrical

e.            Filamentous

5.            Within a host, receptor molecules can also determine the            , or tendency to infect a particular tissue type

a.            Tropism

b.            Lysogeny

c.             Virulence

d.            Burst size

e.            Plaque

6.            Slow release of bacteriophage progeny from a bacterial host cell

a.            Does not kill the host cell

b.            Is a feature particular to filamentous phage

c.             Causes cell lysis

d.            B and C are correct

e.            A and B are correct

7.            Which statement among A-D is false regarding animal viral infections?

a.            Uncoating refers to the process of viral exit from the host cell

b.            Depending on the virus type, assembly of viruses may occur in the nucleus or cytoplasm

 

c.             Budding is a mechanism of virus exit that leads to acquisition of the envelope around the viral particles

d.            Endosome formation is a mechanism that allows for the viral genome to be freed from the capsid

e.            None of A-D are false

8.            Which statement is false concerning retroviruses:

a.            The information flow of such viruses is: RNA to DNA to RNA to protein

b.            They can form a provirus

c.             They can remain in the provirus state while simultaneously initiating production of new viral particles

d.            None of A-C are false; they are all true statements

9.            Viroids lack

a.            Proteins

b.            Infectivity

c.             Nucleic acids

d.            Catalytic activity

10.          In the CRISPR system of bacteria, the spacer is a(n)

a.            Bacterial gene

b.            Bacterial enzyme

c.             Piece of phage DNA

d.            Inactive viral RNA

e.            Cascade protein

11.          The period of time when virions are virtually undetectable inside the infected cell is the

a.            Eclipse period

b.            Latent period

c.             Rise period

d.            Burst period

e.            Lag period

12.          Which of the following is an example of vertical gene transfer or transmission?

a.            Conjugation

b.            Formation of daughter cells

c.             Transformation

d.            Integration of a plasmid into the host chromosome

e.            All the above are examples of vertical gene transfer

13.          Most structural genes of bacteria are grouped together and transcribed from a single    ; immediately following this sequence is the    that interacts with a regulatory protein to affect transcription of the genes

a.            Gene; promoter

b.            Ribosome; promoter

c.             Promoter; operator

d.            Promoter; structural gene

e.            Ribosome; operator

14.          A structural gene is

a.            An organism’s entire genetic complement of DNA

 

b.            A string of nucleotides that can be used as a template to produce a RNA that codes for a protein

c.             A string of nucleotides that can be decoded by an enzyme to produce a protein

d.            An enzyme involved in the conversion of DNA into RNA