The cytoplasmic (plasma) membrane of bacteria:
a) retains the cytoplasm and its contents
b) acts as a selectively permeable barrier, allowing some molecules to pass while preventing the movement of others
c) is the major site of ATP synthesis (respiration) in aerobes
d) all of the above
Ans: d) all of the above
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In allosteric control, activity of the enzyme is regulated by an ________ binding to the ________
a. enzyme / allosteric site b. activator / active site c. activator or inhibitor / allosteric site d. inhibitor / active site
Epithelial cells are specialized for four of the five following functions. Select the exception
a. secretion b. protection c. diffusion d. contraction e. absorption
An operon:
A: is transcribed when RNA polymerase binds the operator. B: has several promoters, but all of the structural genes are related biochemically. C: is a cluster of functionally related genes that are transcribed all of the time at a constant rate. D: is regulated by a repressor protein binding to the promoter. E: is a cluster of structural genes that are all transcribed from the same promoter.
After DNA synthesis (i.e., S-phase) an identical copy of the DNA has been made and this is present in the two chromatids when viewed as the chromosome.
a. true b. false