A cell in G1 phase has the option of entering which two phases?
What will be an ideal response?
S phase or G0
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As blood leaves the heart, which of the
following is the correct order of vessels traveled?
a. vein, arteries, capillaries, venules, arterioles b. arteries, veins, capillaries, arterioles, venules c. arteries, capillaries, arterioles, venules, veins d. arteries, arterioles, capillaries, venules, veins e. veins, venules, capillaries, arterioles, arteries
The methylation and demethylation of regions
of DNA triggered by changes in the environment and resulting in phenotypic changes are an example of
a. pleiotropy. b. environmental effects. c. epistasis d. epigenesis. e. more than one of these
The fact that in bacterial genomes it is difficult to generate inversions of segments with highly-transcribed genes suggests that
a. bacterial cells actively inhibit chromosomal rearrangements. b. the consequences of DNA polymerase encountering RNA polymerase moving the opposite direction may be lethal. c. DNA replication and transcription cannot occur simultaneously. d. bacterial genes are generally transcribed in the opposite direction of replication. e. inversion somehow affects transcription rates.
The membrane attack stage of the complement cascade involves
A. C1q binds to surface receptors on a membrane. B. cleaving of C3 to yield C3a and C3b. C. initiation of the cascade. D. production of inflammatory cytokines. E. the assembly of a ring-shaped protein that forms holes in bacterial cell membranes and virus envelopes.