Which of the following is not generally a way to control the activity of a positive activator?
a. binding of an inhibitor that affects its ability to bind to DNA
b. synthesis of protein in a specific tissue type
c. covalent modification of a protein
d. transport of the protein out of the cell
e. binding of a ligand
Ans: d
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The nephron is composed of all of the following structures except:
A. the ureter. B. the collecting ducts. C. the glomerulus. D. the renal tubules. E. the capsule.
A control group
a. receives the same treatment as the experimental group. b. is an untreated group of individuals or subjects. c. is sometimes exposed to harsh conditions. d. is often an unnecessary waste of material. e. is not subjected to experimental error
Insects use ____ as a respiratory system
a. integument exchange b. lungs c. tracheal exchange d. gills e. none of these
Gel electrophoresis separates DNA molecules based on variability in their
A) nucleotide sequence. B) affinity for agarose. C) charge. D) size. E) charge and size.