Ch. 13 MASTERING MICROBIOLOGY

24 July 2022
4.7 (114 reviews)
13 test answers

Unlock all answers in this set

Unlock answers (9)
question
Which of the following is an essential component of all viruses? a. envelope b. DNA c. capsid d. ribosomes
answer
c.
question
Put the following viral structures in order, from simplest to most complex: I. virion II. capsomere III. capside IV. nucleocapsid
answer
II, III, IV, I
question
Most viral genomes are much smaller than the genomes of the cells they infect. Which of the following CANNOT be inferred from this statement? a. Viral genomes usually contain fewer genes than cellular genomes. b. Viral genomes usually do not encode all of the enzymes or structures necessary for their replication. c. Viral genomes can be enclosed in very small capsids. d. Most viruses can infect only certain types of cells.
answer
d.
question
Which of the following statements describes a generalist virus? a. It does not cause disease in the organisms it infects. b. It can have several different types of genomes. c. It infects many kinds of cells in many different hosts. d. It does not have a particular sequence of events in its life cycle.
answer
c.
question
The envelope found in some virus particles differs from the cytoplasmic membrane of cells in that ____. a. it is not as dense as a cytoplasmic membrane b. it is not as flexible as a cytoplasmic membrane c. it contains different types of phospholipids than does a cytoplasmic membrane d. it does not perform the physiological functions carried out by the cytoplasmic membrane
answer
d.
question
Which of the following is NOT represented in viral classification schemes? a. specific epithet b. family c. class d. genus
answer
c.
question
Lysogeny is associated with all of the following EXCEPT _____. a. animal viruses b. increasing virulence of host bacterium c. a prophage d. bacteriophages
answer
a.
question
The infectious cycles of enveloped animal viruses and temperate bacteriophages are more similar because ____. a. there is no viral activity, signs, or symptoms of infection in the host cell b. virions are released rapidly and in high numbers from lysing cells c. the infected cell may live for a long time d. the viral genome of each always becomes incorporated into the host cell's genome
answer
c.
question
Lysozyme is important for which of the following stages of lytic replication in bacteriophage T4? a. attachment b. entry and release c. synthesis d. assembly
answer
b.
question
Both viruses and carcinogenic chemicals can cause tumors by _______. a. slowing cellular growth b. disruption of cell division c. killing cells d. creating new cellular genes
answer
b.
question
Viruses can be grown in all of the following EXCEPT _______. a. embryonated eggs b. sterile nutrient agar c. live animals d. tissue culture
answer
b.
question
Which of the following is NOT a way in which viruses differ from all other living things? a. they do not grow b. they cannot respond to environment stimuli through metabolic changes c. they cannot self-replicate d. they live inside host cells
answer
d.
question
Process of bacteriophage replication cycle.
answer
1. attachment 2. entry 3. bacterial chromosome degraded 4. synthesis 5. assembly 6. release