The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of different
A) amino groups.
B) side chains (R groups).
C) tertiary structure.
D) carboxyl groups.
E) Both A and B are correct.
Ans: B) side chains (R groups).
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Which of the following statements about invasive species is false?
A. The effect of invasive species on natural communities is always a reduction in diversity. B. Humans are responsible for dramatic increases in the number of invasive species. C. Invasive species often thrive in new areas because they have few natural predators. D. Introduction of invasive species has more devastating effects on islands because of the smaller number of predators and competitors in these systems. E. Invasive species reduce community diversity through displacement, competition, and predation.
Broad term for any DNA segment that moves about in the genome
Match the description with the appropriate term.
New variations of genes may be produced by all of the following EXCEPT
a. immigration. b. mutation. c. crossing over. d. sexual reproduction. e. fission.
In some organisms, a normal stop codon, UGA, encodes for the amino acid
A) leucine. B) arginine. C) isoleucine. D) selenocysteine. E) cysteine.