Pelagic organisms live:
a. in the water column.
b. on the sediment.
c. in the sediment.
d. in hydrothermal vents.
e. close to shore.
A
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The primary transcripts in eukaryotes are most accurately described as
A. composed of RNA polymerase and associated histones. B. having the exons removed and the introns retained for translation. C. a faithful copy of the entire gene including exons and introns. D. an exact copy of the gene, but the introns have been removed. E. an RNA copy, but the non-coding exons and introns have been removed.
How do modified and unmodified histone subunits become distributed among nucleosomes after replication?
A. The newly synthesized DNA strand contains unmodified histone subunits, while the old strand retains the modified histones. B. Both strands of DNA are repopulated first with a mixture of modified and unmodified H2A histones, followed by mixtures of H2B, H3, and, finally, H4. C. Both strands of DNA are repopulated first with a mixture of modified and unmodified H2A and H2B histones, followed by mixtures of H3 and finally mixtures of H4. D. Both strands of DNA retain H3-H4 modified pairs, and then are repopulated with unmodified H3-H4 pairs, followed by modified and unmodified H2A-H2B. E. Both strands of DNA retain H2A-H2B modified pairs, and are then repopulated with unmodified H2A-H2B pairs and then mixtures of modified and unmodified H3-H4 pairs.
A woman with severe acne wishes to go on Accutane even though she is pregnant. Based on this drug's critical period, when would be a reasonably safe time for her to do so?
A) When she first becomes pregnant B) After her first month of pregnancy C) After her second month of pregnancy D) After her fourth month of pregnancy
Blood pressure is the force that drives molecules out of the glomerulus into the Bowman's capsule.
a. true b. false