How many codons are in the mRNA sequence GGAAUGAAACAGGAACCC?

A. 0 because mRNA has only anticodons
B. 6
C. 27
D. 9
E. 3


B. 6

Biology & Microbiology

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The Saguaro cactus is a large cactus found in some southwestern desert environments. It plays

a central role in providing habitat for a variety of other species, and if these cacti die or are removed from the ecosystem, biodiversity declines. Thus, the Saguaro cactus is a __________.

a. keystone species b. tertiary consumer c. generalist d. trophic level

Biology & Microbiology

Klinefelter syndrome is a genetic disorder in which males have an extra X chromosome

These individuals have some breast development, small testes, and sparse facial and body hair. This syndrome is likely a result of _______________.

a. nondisjunction b. incomplete crossing over c. problems with DNA replication d. lack of spermatogenesis

Biology & Microbiology

Which of the following is NOT true of enzyme behavior?

a. Enzyme shape may change during catalysis. b. Enzymes cannot make something happen that would not happen on its own. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzymes speed up reactions.

Biology & Microbiology

Which protein blocks the interaction sites that produce skeletal muscle contraction?

a. actin b. myosin c. troponin d. tropomyosin e. sarcoplasmic reticulum

Biology & Microbiology