Which plants are often the dominant land plants in cool temperate zones, especially in areas with poor soils?
a. gymnosperms
b. ferns
c. angiosperms
d. bryophytes
Answer: a. gymnosperms
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What is another name for the polymers of carbohydrates?
A. Triglycerides B. Nucleotides C. Polypeptides D. Polysaccharides
Antigens specifically associate with an antibody's
A. hinge region. B. heavy chain constant regions only. C. variable regions of the heavy chains and light chains combined. D. light chain variable regions only. E. tail.
Which statement is NOT correct about the trp operon?
A. Tryptophan acts as the corepressor. B. The structural genes make products that are part of an anabolic pathway for the synthesis of tryptophan. C. Tryptophan binds to the repressor protein and inactivates it. D. It is normally turned off if tryptophan is present.
Proteins made on ribosomes may be further modified within which organelle?
a. nucleus. b. lysosomes. c. mitochondria. d. Golgi complex. e. peroxisomes