Insulin is a product of the
A. liver.
B. stomach.
C. kidney.
D. pancreas.
E. brain.
Answer: D
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What term is used to describe the phenomenon in which a bacteriophage genome incorporates its genome into the chromosome of the host?
What will be an ideal response?
The sickle-cell allele produces a serious blood disease in homozygotes. Why doesn't natural selection eliminate this allele from all human populations?
A) Natural selection is a positive force, so it does not eliminate alleles. B) In populations where endemic malaria is present, heterozygotes have an important advantage: They are resistant to malaria and therefore are more likely to survive and produce offspring that carry the allele. C) Mutations keep bringing the allele back into circulation. D) Natural selection occurs very slowly, but elimination of the sickle-cell allele is expected to occur soon.
The ________ is a complex network of interconnected filaments and tubules that extends throughout the cytosol, from the nucleus to the inner surface of the plasma membrane.
A) cytoskeleton B) microtubule apparatus C) cell scaffold D) desmin sheath E) microfilament array
Motility is best observed with a
A. negative stain B. flagellar stain C. streak plate D. hanging drop preparation