In an inherited form of high cholesterol, rr individuals have a blood cholesterol level greater than 500 mg/dL, Rr individuals are near 300 mg/dL, while normal (RR) cholesterol levels should be less than 200 mg/dL. The R allele is ___ to the r allele. Select one:
a. dominant
b. homozygous
c. incompletely dominant
d. codominant
e. recessive
c. incompletely dominant
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In frog embryos, the blastopore becomes the _____
A) anus B) ears C) eyes D) nose E) mouth
The ubiquitin-proteasome pathway
_____ is used to regulate expression of a number of cell surface receptors. _____ requires only one molecule of ATP to target a protein. _____ targets proteins in a stepwise fashion via ubiquitin ligase adding ubiquitin residues to the protein. _____ is used to digest macromolecules. _____ does not destroy the ubiquitin moiety, but rather cleaves it off for reuse.
Which animal has eggs with waterproofing keratin, well-developed kidneys, internal fertilization, and is an ectotherm?
a. a snake b. a dog c. a toad d. an owl e. more than one of these
The level of depolarization at which an action potential will be triggered is referred to as the
A. refractory potential. B. threshold potential. C. resting potential. D. membrane potential. E. cationic potential.