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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. both DNA and RNA.
2. only RNA.
3. only phosphate.
4. either DNA or RNA. correct
5. only DNA.
Explanation:
Recall
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. protein(s). correct
3. glycoprotein(s).
4. antigen(s).
5. lipoprotein(s).
Explanation:
Recall
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. correct
2. a transfer of material from the host cell.
3. the reduction of the host cell.
4. an alternation of generation in the host
cell.
5. the transformation of the host cell.
Explanation:
Recall
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. shrink because of the loss of cytoplasm
used in the synthesis of viral DNA.
2. reject the virus.
3. replicate itself at a higher than normal
frequency.
4. burst in the presence of abundant viral
particles. correct
5. initiate an attack on the virus.
Explanation:
Recall
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 introduces a gene into the
bacterium’s chromosome that codes for the
cholera toxin (which can cause death in hu- mans). correct
2. The phage alters the host cell, which per-
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Version 001 – Bacterial/Viral Genetics – mahon – (26) 2
mits direct entry of the cholera bacterium into
the host cell (leading to death in humans).
3. A cellular enzyme causes a mutation in
the virus genome.
4. The phage enters the cholera bacterium
genome and causing the bacterium’s cell to
lyse.
5. The phage alters the cell wall of the
cholera bacterium, which produces a toxin
that can cause death in humans.
Explanation:
Starr 21 13
006 10.0 points
HIV, the pathogen that causes AIDS, is a
1. prion.
2. retrovirus. correct
3. DNA virus.
4. a gram negative bacterium.
5. viroid.
Explanation:
Recall
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. nucleic acids and protein correct
2. protein and amino acids
3. protein and monosaccharides
4. protein and lipids
5. nucleic acids and polysaccharides
Explanation:
The genetic material of a virus is a nucleic
acid (either RNA or DNA). It is contained
within a protein coat.
Viral Genetics 01
008 10.0 points
RNA retroviruses evolve more rapidly than
those having a DNA genome because
1. they lack a permeable capsid
2. they are more prone to attack by host
defense mechanisms
3. reverse transcriptases do not have proof- reading mechanisms that correct mutations
correct
4. they have smaller genomes
5. they lack a glycoprotein envelope
Explanation:
Greater propensity to mutation means that
there is more genetic variation for natural
selection to act on.
Viruses and Prokaryotes02
009 10.0 points
Which of the following statements about
viruses is true?
1. They can regulate the movements of sub- stances into and out of the cell.
2. They are acellular. correct
3. They are readily destroyed by antibi- otics.
4. They can reproduce outside of living
cells.
5. They are large and therefore easy to
study.
Explanation:
Viruses and Prokaryotes12
010 10.0 points
Antibiotics are ineffective as treatments
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Version 001 – Bacterial/Viral Genetics – mahon – (26) 3
against viruses because
1. viruses may reproduce immediately and
destroy the antibiotic
2. the nucleic acid of viruses is single- stranded rather than double-stranded.
3. viruses do not have either a cell wall or the
ribosomal biochemistry of bacteria. correct
4. viruses can remain inactive until the an- tibiotic disintegrates.
5. viruses have RNA instead of DNA.
Explanation:
Holt Bio 20 09
011 10.0 points
Bacterial chromosomes consist of which of the
following?
1. only introns
2. DNA in paired chromosomes
3. a single circular piece of DNA correct
4. DNA or RNA in various forms
5. linear pieces of DNA
Explanation:
Recall
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. inversion
2. recombination
3. transfection
4. transformation
5. conjugation correct
Explanation:
Recall
Starr 14 21
013 10.0 points
DNA segments that move spontaneously from
one region of the genome to another are
1. transposons. correct
2. introns.
3. enhancer.
4. exons.
5. codons.
Explanation:
Recall
Starr 15 01
014 10.0 points
In the lactose operon of E.coli , the operators
1. encode enzymes that break down lac- tose.
2. bind the repressor protein. correct
3. releases the repressor protein.
4. encode the repressor protein.
5. are binding sites for RNA polymerase.
Explanation:
Recall
Starr 16 03
015 10.0 points
A plasmid is
1. a bacterial chromosome.
2. a small circular molecule of DNA with
only a few genes besides the chromosomal
DNA. correct
