The mutations found in the CF gene that result in cystic fibrosis are recessive because
A) the protein produced by the normal allele is sufficient for normal cellular function.
B) the CF mutations always result in no protein being produced.
C) CF mutations result in a protein that has normal function only if normal CF protein also exists in the cell.
D) dominant alleles that cause a fatal disorder, such as cystic fibrosis, cannot be inherited.
A) the protein produced by the normal allele is sufficient for normal cellular function.
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Based on what the chapter describes about the melting temperature of fatty acids, which of the following would be likely to increase the stability of a lipid bilayer?
A. an increase in unsaturated fatty acids B. an increase in saturated fatty acids C. a decrease in overall tail length D. an increase in unsaturated fatty acids and an increase in saturated fatty acids E. an increase in saturated fatty acids, and a decrease in overall tail length
Color vision in vertebrates is made possible by:
A. cone cells. B. rod cells. C. amicrine cells. D. ganglion cells.
Which letter in the figure above represents the littoral zone?
a. A b. B c. C d. D e. E
Two chains of DNA must run in __________ direction(s) and must be __________ if they are to bond
with each other. a. the same; uncomplementary b. opposite; uncomplementary c. parallel; uncomplementary d. parallel; complementary e. antiparallel; complementary