Proteins to be exported are typically recognized by either
a. SecA or SRP.
b. Tus or Ter.
c. FtsZ or Rho.
d. RpoD or FliA.
Answer: A
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Unlike all other amine derived hormones, thyroid hormones
A. bind to membrane receptors to elicit a response. B. activate second messengers via binding to a membrane receptor. C. are derived from cholesterol. D. are produced by the gonads. E. bind to intracellular receptors rather than to membrane-bound receptors to elicit a response.
Treponema pallidum
A. can cross the placenta. B. has a hooked tip to attach to epithelium. C. is transmitted by direct sexual contact. D. has humans as the sole reservoir. E. All of the choices are correct.
The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is the
A. troponin. B. endoplasmic reticulum. C. transverse tubules. D. sarcoplasmic reticulum. E. Golgi bodies.
According to this figure, heterozygotes for this form of hypercholesterolemia suffer from the disease because they
A) produce an abnormally shaped LDL receptor.
B) don't produce any LDL receptors.
C) produce too many LDL receptors.
D) don't produce enough LDL receptors.