Gametes may carry different combinations of alleles because of
A. crossing-over and random alignment of chromosomes.
B. random alignment of chromosomes.
C. random fertilization and crossing-over.
D. random fertilization and alignment of chromosomes.
E. random fertilization.
A. crossing-over and random alignment of chromosomes.
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Cats cannot synthesize the amino acid taurine. This means that in cats, taurine
A. is not a required nutrient. B. is an essential amino acid. C. is a nonessential amino acid. D. must be stored in cellular compartments. E. is not present in their normal diet.
The resistance of Archaeans to extremes of temperature, salinity, and pH is thought to be due to what structural feature?
a. covalent crosslinking among membrane phospholipids b. phospholipids that spin, drift, and wiggle without leaving the bilayer c. membrane proteins that are covalently bonded together d. high proportion of unsaturated fatty acids in phospholipids
The sodium–potassium pump is a carrier protein that maintains a(n) ____ gradient across the plasma membrane
a. polar b. nonpolar c. phosphorous d. concentration e. electrochemical
Which of the following is a scientific name?
A. species B. bacteria C. Bacillus subtilis D. bacilli E. Protista