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23 Cards in this Set

  • Front
  • Back
2) During multiplication of influenza A virus, the nucleocapsid protein must bind to newly synthesized viral genomes before new virions are assembled. Where in the host cell does this occur?
a) Cytoplasm
b) Nucleus
c) Endoplasmic reticulum
d) Endosome
e) At the plasma membrane
B
1) For which type of single-stranded RNA viruses is the sequence of the viral RNA found in virions complementary to the sequence of the viral mRNAs?
a) (+) strand RNA viruses
b) (-) strand RNA viruses
B
3) Which of the following statements best describes how new influenza A virions EXIT from host cells?
a) Budding from the nuclear membrane
b) Budding from the plasma membrane
c) Viral lipases degrade the plasma membrane
d) Hydrolysis of the cell wall causes osmotic lysis of the host cell
e) Membrane vesicles containing progeny virions fuse with the plasma membrane
B
4) Which, if any, of the following influenza A proteins is NOT found in virions?
a) NS2 (NEP)
b) NS1
c) M1
d) RNA-dependent RNA polymerase (PB1+PB2+PA)
e) M2
B
5) Tissue culture cells are infected with a mutant influenza A virus that lacks the RNA-dependent RNA polymerase. Which of the following best describes what happens during infection by the mutant virus?
a) The viral genome will be replicated, but viral mRNAs will not be synthesized
b) Viral mRNAs will be translated, but the viral genome will not be replicated
c) Viral proteins will not be synthesized and the viral genome will not be replicated
d) The mutant virus will be unable to enter host cells
e) Newly synthesized viral genomes will be unable to exit the nucleus
C
6) One or more of the mechanisms listed below are likely to be used by an enveloped virus to enter eukaryotic host cells. Which, if any, are NOT?
a) A host uptake pathway is triggered when the virion binds to specific receptor molecules on the host cell
b) Fusion with the plasma membrane
c) The capsid binds to a specific receptor on the host cell and the viral genome is injected into the cytoplasm of the host
d) All of the above mechanisms might be used by enveloped viruses to enter eukaryotic host cells
e) None of the above mechanisms are used by enveloped viruses to enter eukaryotic host cells
C
7) Capsids are protein coats or shells that surround the nucleic acid in a virion. From the choices listed below, what is the total number of protein molecules that might form an icosahedral capsid?
a) 1
b) 5
c) 20
d) 100
C
8) Which of the molecules listed below would you expect to inhibit binding of a human-adapted influenza virus to human tissue culture cells?
a) alpha-2,3 linked sialic acid and galactose
b) alpha-2,6 linked sialic acid and galactose
c) alpha-2,6 linked sialic acid and sialic acid
d) alpha-2,3 linked galactose and galactose
e) N-acetylglucosamine
B
9) Chemicals that inhibit the M2 ion channel of influenza A virus will block the viral life cycle at which step?
a) Entry into host cells
b) Transport of genome segments into the nucleus
c) Synthesis of viral proteins
d) Assembly of new virions
e) Exit from the endosome
E
10) The spike proteins of influenza A virus are:
a) HA and M2
b) NA and M2
c) HA and M1
d) NA and M1
e) HA and NA
E
11) The sequence of the 16S ribosomal RNA present in chloroplast ribosomes is most similar to that of bacteria belonging to which of the following bacterial phyla?
a) Phylum Cyanobacteria
b) Phylum Chloroflexi
c) Phylum Proteobacteria
d) Phylum Chlorobi
A
12) Which of the following statements best defines a dimorphic fungus?
a) A fungal species that has both a hyphal form and a single-celled form
b) A fungal species where organisms of different mating types have different morphologies
c) A fungal species that has only two mating types
d) A fungal species that produces both septate and nonseptate hyphae
e) A fungal species where both haploid and diploid forms can reproduce asexually
A
13) Which of the following molecules is a major component of fungal cell walls?
a) Chitin
b) -Glucans
c) Glycoproteins
d) All of the above molecules are commonly found in fungal cell walls
e) None of the above molecules are commonly found in fungal cell walls
D
14) Which of the following is NOT a characteristic of fungi?
a) Both sexual and asexual reproduction
b) Secretion of degradative enzymes
c) Transport proteins in the plasma membrane for the uptake of small molecules
d) Spore production
e) Photosynthesis
E
15) Arbuscular mycorrhizal fungi live in association with plant roots and penetrate the cell wall of the host root cells. What nutrient(s) do the fungi obtain from the plant?
a) Carbohydrates that serve as a carbon and energy source
b) Carbohydrates that serve as the source of carbon, but not energy
c) Polyphosphate
d) Amino acids
e) ATP
A
16) Where in the mosquito host does Plasmodium vivax reproduce?
a) Salivary glands
b) Hemolymph (the insect analog of blood)
c) Oviduct
d) Malpighian tubules
e) Gut
E
17) The stage of the Plasmodium vivax parasite that is transferred to a person by a mosquito is the:
a) Merozoite
b) Sporozoite
c) Oocyst
d) Schizont
e) Gametocyte
B
18) The stage of the Plasmodium vivax parasite that infects red blood cells is the:
a) Merozoite
b) Sporozoite
c) Oocyst
d) Schizont
e) Gametocyte
A
19) Undergoes normal mitotic division during asexual reproduction
a) Ciliates (Ciliaphora)
b) Dinoflagellates (Dinoflagellata)
c) Macronucleus
d) Micronucleus
e) Trichocysts
D
20) Paramecium belongs to this group of protists
a) Ciliates (Ciliaphora)
b) Dinoflagellates (Dinoflagellata)
c) Macronucleus
d) Micronucleus
e) Trichocysts
A
21) Where synthesis of mRNA occurs during growth and asexual reproduction
a) Ciliates (Ciliaphora)
b) Dinoflagellates (Dinoflagellata)
c) Macronucleus
d) Micronucleus
e) Trichocysts
C
22) Organelle that helps protect Paramecium from some predators
a) Ciliates (Ciliaphora)
b) Dinoflagellates (Dinoflagellata)
c) Macronucleus
d) Micronucleus
e) Trichocysts
E
23) Undergoes meiosis during conjugation
a) Ciliates (Ciliaphora)
b) Dinoflagellates (Dinoflagellata)
c) Macronucleus
d) Micronucleus
e) Trichocysts
D