Species of both Shigella and Streptococcus
A. invade host cells.
B. produce a toxin.
C. cause ergot poisoning.
D. are delivered via flea bites.
E. invade host cells AND produce a toxin.
E
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In the figure above, step "a" represents
a. the two parental DNA strands. b. the two F1 generation DNA strands. c. the two F2 generation DNA strands. d. the DNA molecule to be transcribed. e. the DNA molecule to be translated
When Calvin injected 14C labeled CO2 into cultures of green algae, what result was obtained because the molecule accepting the CO2 was unstable?
A. Radioactivity first appeared in 3-phosphoglycerate. B. Radioactivity first appeared in glucose. C. Radioactivity appeared last in ribulose bisphosphate. D. Radioactivity appeared last in glucose. E. Radioactivity appeared last in 3-phosphoglycerate. F. Radioactivity first appeared in ribulose bisphosphate.
Semiconservative DNA replication means that
A) each daughter DNA molecule is composed of one original strand and one new strand. B) nucleotides are constantly being recycled as cells make DNA. C) the cell can proofread its newly synthesized DNA only part of the time. D) the sequence of a DNA molecule is preserved as it is being replicated. E) each strand of a double-stranded DNA molecule is replicated differently.
Homo erectus was the only hominin species to disperse from Africa.
a. true b. false