The part of the axon closest to the cell body is the
A. hillock.
B. soma.
C. nucleus.
D. myelin sheath.
E. dendrite.
Answer: A
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A common structure for proteins that bind DNA is helix-turn-helix
Indicate whether the statement is true or false.
For a pure culture of Saccharomyces cerevisiae cells that were all derived from a single cell to mate,
A) a mating-type switch in one or more cells in the culture must occur. B) both the ? and the a gene must be fully expressed in the population. C) the ? gene must be fully repressed in the population. D) some cells must exist as diploids.
A population of grasshoppers in the Kansas prairie has two color types: green and brown. Typically, the prairie receives enough rainfall to maintain healthy, green grass. Assume a bird species that eats grasshoppers moves into the prairie
How will this affect the natural selection of the grasshoppers? How might this change in a drought year, when the grass turns brown?
Gene regulation in eukaryotes is more complicated than bacterial gene regulation. Which of the following describes a gene regulation event that occurs in eukaryotes but not in bacteria?
A) In eukaryotes, mRNA does not need to be modified. B) In eukaryotes, transcription and translation occur in the same cellular compartment. C) In eukaryotes, histones must be added or removed to regulate gene expression. D) In eukaryotes, mRNA degrades quickly compared to bacterial mRNA that is more stable. E) In eukaryotes, proteins are post-translationally modified, whereas bacterial proteins are never post-translationally modified.