Any agent that can change the base sequence of DNA is known as a:
A) mutagen.
B) spontaneous event.
C) trinucleotide repeat.
D) free radical.
E) cancer.
Answer: A
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The tRNA nucleotide sequence that pairs with bases on the mRNA is called a(n)
A. intron. B. exon. C. codon. D. initiation factor. E. anticodon.
The terms "run" and "tumble" are generally associated with
A) eukaryotic cells. B) nutrient transport. C) chemotaxis. D) clustering of certain rod-shaped bacteria.
Many snake venoms contain an acetylcholinesterase inhibitor. Predict what effect the presence of this toxin would have on muscles
A. There would be no effect. Acetylcholine is the ligand. B. Muscles would be prevented from contracting. C. Muscles would lose their ability to contract due to the loss of membrane potential. D. Muscles would contract uncontrollably.
Consider a diploid population in which a single locus supports two alleles, A1 and A2, whose respective allele frequencies equal p and q. The summation of p+q would equal:
a. 0.25 b. 0.5 c. 1 d. 1.5 e. 2