Which of the following is a change in the sequence that leads to formation of a stop codon?
A) missense mutation
B) nonsense mutation
C) silent mutation
D) deletion mutation
Ans: B) nonsense mutation
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The epsilon (?) subunit of DNA polymerase III of E. coli has exonuclease activity. How does it function in the proofreading process? The epsilon subunit _____
A) removes a mismatched nucleotide B) excises a segment of DNA around the mismatched base C) can recognize which strand is the template or parent strand and which is the new strand of DNA. D) adds nucleotide triphosphates to the end of the growing DNA strand
When you feel threatened, the neurotransmitter norepinephrine is released from the adrenal gland in response to
stimuli by ____ neurons.
a. somatic b. sensory c. sympathetic d. motor e. parasympathetic
What type of test would you use to determine whether observed data constitute evidence of genetic linkage or are simply a case of chance variation from expected values?
A) test cross B) two-point test cross C) three-point test cross D) chi-square analysis E) recombination frequency (r) calculation
Reproductive systems with external fertilization are most common in
A) terrestrial animals. B) populations with many more males than females. C) animals that are widely dispersed. D) aquatic animals.