________ 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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology