A protein region with a specific function and structure is called a
A) conserved site.
B) domain.
C) locale.
D) motif.
Answer: B
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The acetylcholine receptor is
A. a ligand-gated ion channel that produces depolarization by allowing Na+ ions to enter the muscle fiber. B. a ligand-gated ion channel that produces hyperpolarization by allowing Na+ ions to enter the muscle fiber. C. a ligand-gated ion channel that produces depolarization by allowing Cl- ions to enter the muscle fiber. D. a ligand-gated ion channel that produces depolarization by allowing K+ ions to leave the muscle fiber. E. a metabotropic receptor that stimulates muscle activity by activating second messenger systems within the muscle fiber.
Incorporation of urea into media is used to enhance the detection of which organism?
a. U. urealyticum b. M. pneumoniae c. M. hominis d. M. genitalium
A male with an extra X chromosome (XXY) has Turner syndrome.
a. true b. false
What exactly does transfer RNA (tRNA) transfer?
A) amino acids to the RNA polymerase during transcription B) carbohydrates throughout the cytoplasm during transcription C) nucleotides that are to be added to a growing polypeptide chain D) the two ribosomal subunits to the start sequence and initiates the start of translation E) amino acids to the ribosome during translation