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Version 001 – Bacterial/Viral Genetics – mahon – (26) 1
This print-out should have 64 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
Holt Bio 20 07
001 10.0 points
The nucleic acid of a virus consists of
1. only RNA.
2. only phosphate.
3. both DNA and RNA.
4. only DNA.
5. either DNA or RNA.
Raven26 10
002 10.0 points
Most viruses form a capsid around their nu- cleic acid core.
This capsid is composed of
1. monosaccharide(s).
2. lipoprotein(s).
3. protein(s).
4. antigen(s).
5. glycoprotein(s).
Raven26 11
003 10.0 points
Virulent viruses multiply infected cells and
eventually cause the cell release new viruses
by a process called
1. lysis of the host cell.
2. the reduction of the host cell.
3. a transfer of material from the host cell.
4. an alternation of generation in the host
cell.
5. the transformation of the host cell.
Raven26 38
004 10.0 points
If the virus enters the lytic phase in a host’s
cell, it will cause the host cell to
1. replicate itself at a higher than normal
frequency.
2. reject the virus.
3. initiate an attack on the virus.
4. burst in the presence of abundant viral
particles.
5. shrink because of the loss of cytoplasm
used in the synthesis of viral DNA.
Raven26 39
005 10.0 points
Scientists have demonstrated that the
cholera-causing bacterium Vibrie cholerae ex- ists in at least two forms. It usually exists in a
rather harmless form; however, a phage con- version can occur which produces a disease- causing, virulent form.
When does the harmless form of the cholera
causing bacterium Vibrie cholerae undergo
conversion in virulent form?
1. The phage alters the host cell, which per- mits direct entry of the cholera bacterium into
the host cell (leading to death in humans).
2. The phage introduces a gene into the
bacterium’s chromosome that codes for the
cholera toxin (which can cause death in hu- mans).
3. The phage enters the cholera bacterium
genome and causing the bacterium’s cell to
lyse.
4. The phage alters the cell wall of the
cholera bacterium, which produces a toxin
that can cause death in humans.
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Version 001 – Bacterial/Viral Genetics – mahon – (26) 2
5. A cellular enzyme causes a mutation in
the virus genome.
Starr 21 13
006 10.0 points
HIV, the pathogen that causes AIDS, is a
1. a gram negative bacterium.
2. retrovirus.
3. DNA virus.
4. prion.
5. viroid.
StarrC 20 04
007 10.0 points
What are the two components of all viruses
that constitute the genetic material within
their protein coat?
1. protein and lipids
2. nucleic acids and polysaccharides
3. protein and amino acids
4. protein and monosaccharides
5. nucleic acids and protein
Viral Genetics 01
008 10.0 points
RNA retroviruses evolve more rapidly than
those having a DNA genome because
1. reverse transcriptases do not have proof- reading mechanisms that correct mutations
2. they have smaller genomes
3. they lack a permeable capsid
4. they are more prone to attack by host
defense mechanisms
5. they lack a glycoprotein envelope
Viruses and Prokaryotes02
009 10.0 points
Which of the following statements about
viruses is true?
1. They are large and therefore easy to
study.
2. They can regulate the movements of sub- stances into and out of the cell.
3. They are acellular.
4. They are readily destroyed by antibi- otics.
5. They can reproduce outside of living
cells.
Viruses and Prokaryotes12
010 10.0 points
Antibiotics are ineffective as treatments
against viruses because
1. viruses may reproduce immediately and
destroy the antibiotic
2. viruses have RNA instead of DNA.
3. viruses can remain inactive until the an- tibiotic disintegrates.
4. the nucleic acid of viruses is single- stranded rather than double-stranded.
5. viruses do not have either a cell wall or
the ribosomal biochemistry of bacteria.
Holt Bio 20 09
011 10.0 points
Bacterial chromosomes consist of which of the
following?
1. DNA in paired chromosomes
2. DNA or RNA in various forms
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Version 001 – Bacterial/Viral Genetics – mahon – (26) 3
3. linear pieces of DNA
4. only introns
5. a single circular piece of DNA
Raven20 41
012 10.0 points
In bacteria, genes may be transferred through
a pilus which acts like a bridge in which pro- cess?
1. recombination
2. transfection
3. inversion
4. transformation
5. conjugation
Starr 14 21
013 10.0 points
DNA segments that move spontaneously from
one region of the genome to another are
1. introns.
2. codons.
3. enhancer.
4. exons.
5. transposons.
Starr 15 01
014 10.0 points
In the lactose operon of E.coli , the operators
1. are binding sites for RNA polymerase.
2. bind the repressor protein.
3. encode the repressor protein.
4. encode enzymes that break down lac- tose.
5. releases the repressor protein.
Starr 16 03
015 10.0 points
A plasmid is
1. a linear fragmentory DNA.
2. a bacterial chromosome.
3. a small circular molecule of DNA with
only a few genes besides the chromosomal
DNA.
4. found only in eukaryotes.
5. a collection of DNA fragments produced
by restriction enzymes.
Starr 21 10
016 10.0 points
A small, self-replication circle of DNA that
has a few genes is a
1. lysozyme.
2. prion.
3. transposable element.
4. plasmid.
5. viroid.
Starr 21 11
017 10.0 points
In bacterial conjugation,
1. each cell inherits a single bacterial chro- mosome.
2. an RNA template is used to synthesize
DNA.
3. plasmid DNA is transferred from one bac- terium to another.
4. one parent cell gives rise to two daughter
