Which PCR step synthesizes complimentary DNA strands?
A. Cool DNA to between 50°C and 65°C.
B. Add DNA polymerase and nucleotides at 72°C.
C. Repeat the cycle of heating and cooling.
D. Add primers.
E. Heat target DNA to 94°C.
Answer: B
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The potential seventh mass extinction refers to ____
a. the loss of 50% of species on Earth, including dinosaurs, at the end of the Cretaceous b. the most extensive loss of species that occurred during the Permian c. what will happen to the human species if a nuclear war occurs d. the rapid loss of biodiversity due to human degradation of the environment e. events that occurred just before insects diversified on land
Methylated histone tail amino acids are associated with chromatin that is
A) either open or closed. B) open only. C) closed only. D) newly replicated. E) about to replicate.
One similarity between DNA transposons and retrotransposons is that
A) during transposition, both go through an RNA form that is copied back into DNA. B) both can encode an enzyme required for mobilization. C) transposition results in movement of the original transposon to a different place in the genome. D) they both have poly-A segments at one end.
The world’s forests are rapidly being lost to
a. fires. b. fungal diseases. c. logging. d. hurricanes. e. decrease in soil fertility.