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26 Cards in this Set
- Front
- Back
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Viruses have all of the following except?
a. definite shape b. metabolism c. genes d ability to infect host cells e. ultramicroscopic size |
b. metabolism
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Virus capsids are made from subunits called ?
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capsomeres
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Which of the following is not a typical capsid shape?
a. Tetrahedral b. complex c. helical d. Icosahedron e. all of the above |
a. Tetrahedral
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All of the following pertain to virus envelopes except?
a. Gained as a virus leaves the host cell membrane b. Gained as a virus leaves the nuclear membrane c. contain special virus proteins. d. help the virus particle attache to host cells e. located between the capsid and nucleic acid |
e. located between the capsid and nucleic acid
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Viral spikes ?
a. are always present on enveloped viruses b. bind viral capsid and envelope together c.allow bacteria to evade host defenses d. are derived from host protein e. all of the choices are correct |
b. bind viral capsid and envelope together
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List the different types of viral nucleic acids:
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dsDNA, ssDNA, dsRNA, ssRNA, +sense RNA, - sense RNA, bits and pieces
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Reverse transcriptase synthesizes viral ? from viral ?
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DNA
RNA |
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Viruses with ? sense RNA contain the correct message for translation, while viruses with ? sense RNA must first be converted into a correct message.
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positive
negative |
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Classification of viruses into families involves determining all of the following characteristics except?
a. type of nucleic acid b. type of capsid c. presence of an envelope d. biochemical reactions e. number of strands in the nucleic acid |
d. biochemical reactions
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The correct sequence of events in viral multiplication is ?
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Absorption
Penetration Uncoating Synthesis Assembly Release |
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The envelope of enveloped viruses is obtained by viral ? or exocytosis
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budding
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Visible, clear, well defined patches in a monolayer of virus infected cells in a culture are called ?
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plaques
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Which of the following is not true of an organisms genotype?
a. Is inherited b. are structural genes coding for proteins c. are genes coding for RNA d. are regulatory genes controlling gene expression e. are the expressed traits governed by the genes |
e. are the expressed traits governed by the genes
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The ? is the sum of all the genetic material of a cell
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genome
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The anti-parallel arrangement within DNA molecules refers to ?
a. each base bonding at the 1' position of the sugar b. a purine always bonding to a pyrimidine c. one helix strand that runs from 5' to the 3' direction and the other strand runs from the 3' to the 5' driection d. an original parent DAN strand and one newly synthesized DNA strand comprising a new DNA molecule e. none of the choices are correct |
c. one helix strand that runs from the 5' to the 3' direction and the other strand runs from the 3' to the 5' direction
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Give both names of the enzyme responsible for creating the primers in semi-conservative replication?
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RNA polymerase and primase
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Structural genes code for ?
a. ribosomal RNA molecules b. transfer RNA molecules c. cellular proteins d. gene expression elements e. all of the above |
c. cellular proteins
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DNA polymerase III ?
a. is needed for adding nucleotides during mRNA synthesis b. synthesizes new DNA only in the 5' to 3' direction c. cannot add nucleotides to the lagging strand d. synthesizes and RNA primer e. all of the above |
b. synthesizes new DNA only in the 5' to 3' direction
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? fragments are attached to the growing end of the lagging strand by DNA ligases.
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Okazaki
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In eukaryotic organisms the DNA molecule is tightly wound around ? proteins.
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histone
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The non-transcribed region of DNA to which RNA polymerase binds to initiate transcription is called the ?
a. Promoter b. operator c. operon d. exon e. intron |
a. promoter
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In general, most DNA viruses multiply in the host cell's ? while most RNA viruses multiply in the host cell's ?
a. Nucleus, cytoplasm b. cytoplasm, cell membrane c. cell membrane, cytoplasm d. cytoplasm, nucleus e. nucleus, endoplasmic reticulum |
a. nucleus, cytoplasm
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animal viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called?
a. lysogenic b. latent c. oncogenic d. prions e. viroids |
b. latent
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in transduction, the viral genome ?
a. initiates lysis of the host b. includes DNA from the previous host c. is replicated in the cytoplasm d. is replicated in the nucleus e. none of the above |
b. includes DNA from the previous host
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On DNA if a triplet for alanine is CGT, the the codon is ? and the anticodon is ?
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GCA
CGU |
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The enzyme that unzips DNA so that DNA replicase can start doing its job is ?
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helicase
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