Membrane proteins may function in
A) receiving extracellular signals.
B) amphipathic modification.
C) temperature control.
D) protein manufacture.
E) information storage.
A) receiving extracellular signals.
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Which of the following nucleotide triplets best represents a codon?
A) a triplet separated spatially from other triplets B) a triplet that has no corresponding amino acid C) a triplet at the opposite end of tRNA from the attachment site of the amino acid D) a triplet in the same reading frame as an upstream AUG E) a sequence in tRNA at the end
Which of the following is the correct sequence of hierarchical taxonomic categories?
A. species - family - genus - domain - order - phylum - class - kingdom B. domain - kingdom - phylum - class - order - family - genus - species C. species - genus - family - order - class - order - phylum - kingdom - domain D. kingdom - class - phylum - order - family - genus - species E. kingdom - class - domain - order - phylum - genus - family - species
Being overweight, sluggish, intolerant of cold, confused, and depressed are symptoms of
a. hyperthyroidism. b. Grave's disease. c. acromegaly. d. hypothyroidism. e. Wilson's disease.
A patient had a severe hemorrhage, which has been stopped. The initial hematocrit test is normal. What would you predict for the hematocrit test taken the next day?
A. It will likely be higher, since homeostatic mechanisms will increase levels of erythrocytes. B. It will continue to be normal, since the hemorrhage wasn't severe enough to affect the initial test. C. It will gradually increase as the blood volume is restored. D. It will likely be lower, since blood volume should increase, but erythrocytes take longer to be produced.