Which choice is an example of "recombinant DNA"?
A) a bacterial plasmid combined with a human gene
B) DNA that has been cut with a restriction enzyme
C) DNA that has been amplified by PCR
D) any DNA that has been removed from a cell
Answer: A
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Molecular barcodes are
A. barcodes stamped on vegetables in the supermarket to indicate freshness. B. DNA sequences used to identify and catalog biodiversity. C. radioactively labeled genes used to detect horizontal transfer of genes. D. genetic inversions used to detect crossovers.
The markers that identify "self" are actually
A) genes. B) proteins. C) lipids. D) small surface bumps. E) triplet codons
The monarch butterfly is poisonous to birds; therefore, birds avoid eating them. Viceroy butterflies look very similar
to monarch butterflies, but are not poisonous. Because they look like monarch butterflies, birds also do not eat viceroy butterflies. This is an example of ____.
a. resource partitioning b. competitive exclusion c. mimicry d. camouflage e. commensalism
A rise in sodium levels and extracellular
volume leads to a rise in blood pressure. As a result, a. renin levels rise, but aldosterone levels fall. b. renin levels fall, but angiotensin levels rise. c. renin and aldosterone levels all rise. d. renin and aldosterone levels all drop. e. none of these occur