Intrinsic pacemaker cells are located in the ____
a. Purkinje fibers
b. Bundle branches
c. AV node
d. SA node
e. gap junctions
ANSWER: d
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If a plant species exhibits maternal inheritance for leaf pigmentation, what is the phenotype of the parents of a variegated (green and white leaves) plant?
A. The maternal plant must be white and the paternal plant must be green. B. The maternal plant must be green and the paternal plant must be white. C. The maternal plant must be variegated and the paternal plant can be any color. D. Both the maternal and paternal plant must be variegated. E. The maternal plant must be variegated and the paternal plant must be white.
Which is false regarding the GGC gene?
a. It is present in humans, mollusks, and insects. b. It codes for an enzyme that regulates pattern formation in cone shells. c. It is more than 500 million years old. d. Today the enzyme product of the gene has different functions in different lineages. e. None of these are false.
Most prokaryotes are unicellular.
True or false
Which uses synthetic DNA plus DNA cloning techniques to introduce nucleotide changes at specific sites?
a. artificial chromosome synthesis b. ligation c. oligonucleotide replacement d. site-directed mutagenesis