While our personal genomes can identify genetic risk factors, disease risk is often greatly increased by (select all that apply)
A. diet.
B. exercise.
C. exposure to drugs and other chemicals in
our environment.
D. exposure to ultraviolet radiation.
E. none of these
E
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Which of the following comparisons between the moss life cycle and fern life cycle is NOT valid?
A. Both kinds of plants have flagellated sperm that need water to reach the female gamete. B. The sporophyte generation is much larger than the gametophyte generation in ferns but is smaller than the gametophyte generation in mosses. C. The spores are produced in capsules on stalks in mosses but in small structure called sori on the underside of leaves in ferns. D. Both kinds of plants depend on wind for dispersal of spores. E. The gametes are produced in gametangia in mosses but on the underside of leaves in ferns.
A description of sharks that does not apply to other fish groups is that
A. they are bony, with ray-finned appendages. B. they are cartilaginous craniates without jaws. C. they are bony with lobe-finned appendages. D. they have scaleless skin with lateral lines for sensing vibrations. E. they are cartilaginous craniates with jaws.
Another term for a triplet code is ________
A) an enhancer B) a promoter C) tRNA D) a factor E) a codon
Briefly describe the mechanism by which an internal stop-transfer sequence in a protein causes the protein to become embedded in the lipid bilayer as a transmembrane protein with a single membrane-spanning region
Assume that the protein has an N-terminal signal sequence and just one internal hydrophobic stop-transfer sequence.