________ marks the end of a gene and causes transcription to stop
A) A stop codon
B) RNA ligase
C) A terminator
D) Methionine
Answer: C
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Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because
A. humans synthesize folic acid by a process that is not sensitive to sulfonamides. B. humans do not use folic acid. C. humans do not synthesize folic acid but obtain it in their diets. D. None of these are correct.
Animals that lack a body cavity to separate the gut from the muscles of the body wall are referred to as ____
a. pseudocoelomates b. mesenteries c. acoelomates d. indeterminates e. coelomates
When two organisms do not mate due to the fact that they mate at different times of the year, it is
known as ____.
a. behavioral isolation b. ecological isolation c. gametic isolation d. mechanical isolation e. temporal isolation
Four of the five answers listed below describe changes at the chromosomal level. Select the exception
a. base substitution b. duplication c. translocation d. deletion e. inversion