All of the genes located on a given chromosome
constitute
a. a karyotype.
b. a bridging cross.
c. a wild-type allele.
d. a linkage group.
e. none of these.
Answer: d
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The greatest concentration of nitrogen on earth
is found in
a. living organisms, including bacteria. b. the atmosphere. c. soil minerals. d. fossil fuels. e. oceans.
Which of the following are NOT considered to belong to the Archaea?
A) Thermophiles B) Eubacteria C) Acidophiles D) Halophiles E) Methanogens
A 25-year-old woman is seen on an emergency basis while in shock, with generalized flushing of the skin and mucous membranes. A tampon is present in her vagina. Toxic shock syndrome is suspected. Which of the following mechanisms is responsible for the toxic shock syndrome?
A. Inhibition of acetylcholine release B. ADP ribosylation of ribosomal protein C. Stimulation of G protein D. Cross-linking of MHC II and TCR proteins E. Activation of adenylate cyclase
How do coronaviruses differ from togaviruses?
A) Coronaviruses have an envelope. B) Coronaviruses are RNA viruses. C) Coronaviruses have helical capsids. D) Coronaviruses contain positive RNA. E) Coronaviruses individual capsids can be visualized.