Dryland microbial habitats include ALL of the following EXCEPT
a. endolithic communities.
b. biological soil crusts.
c. epilithic communities.
d. chemolithotrophic mats.
Answer: D
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In skeletal muscle contraction, which of the following must be moved to the grooves in the actin
double helix to uncover the crossbridge binding site?
a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine
The two different forms of fibronectin mRNA produced by two different kinds of cells is an example of
a. transcriptional control. b. post-transcriptional control.. c. transport control. d. translational control. e. post-translational control.
The two hormones involved in seed germination and seed dormancy are
A) auxin and ethylene. B) gibberellin and auxin. C) ethylene and cytokinin. D) abscisic acid and gibberellin. E) cytokinin and auxin.
Which of the following statements about a protein in the lumen of the ER is false?
(a) A protein in the lumen of the ER is synthesized by ribosomes on the ER membrane. (b) Some of the proteins in the lumen of the ER can end up in the extracellular space. (c) Some of the proteins in the lumen of the ER can end up in the lumen of an organelle in the endomembrane system. (d) Some of the proteins in the lumen of the ER can end up in the plasma membrane.