In DNA replication, the newly added nucleotide is joined to the growing DNA strand by
A. DNA polymerase.
B. RNA polymerase.
C. DNA ligase.
D. DNA gyrase.
Ans: A. DNA polymerase.
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Which one of the following is not considered part of the cytoplasm?
A. the endoplasmic reticulum B. the nucleus C. the Golgi apparatus D. the cytoskeleton E. None of these choices is considered part of the cytoplasm.
Small RNA molecules that specifically down-regulate expression by binding to the appropriate mRNA molecule and inhibit translation are
A) mRNAs. B) siRNAs. C) tRNAs. D) rRNAs. E) miRNAs.
Organic molecules with only hydrogens and five carbon atoms cannot _____
A) have a branching carbon skeleton B) have different combinations of double bonds between carbon atoms C) have different positions of double bonds between carbon atoms D) form enantiomers
Match the correct case study in conservation biology with its animal.
A. fruit bats-introduction of new species B. whales-pollution C. prairie chickens-loss of genetic diversity D. Lake Victoria cichlids-loss of habitat E. songbirds-introduction of new species