In the RNA sequence CAAUGACCAG, what will be the first amino acid incorporated?

A. methionine
B. glutamine
C. valine
D. alanine
E. glycine


Answer: A

Biology & Microbiology

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Using the geological time scale, scientists can determine the absolute age of rocks and fossils

a. True b. False

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The following are major events in expression of a gene for insulin, which is secreted outside of certain

mammalian cells. Place these events in order, from earliest to latest. 1: binding of a release factor 2: binding of signal recognition particle (SRP) 3: binding of transcription factors 4: removal of introns 5: scanning of mRNA

a. 4?2?3?1?5 b. 1?4?3?2?5 c. 5?2?1?4?3 d. 3?4?5?2?1 e. 3?2?1?5?4

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Compounds of tin, mercury, arsenic, and copper are no longer used to prevent microbial growth in cooling water primarily because

A. antibiotics are cheaper. B. other chemicals were shown to be much more effective. C. microbes developed resistance to these metals. D. their use contributes to serious pollution of natural waters. E. All of the choices are correct.

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Which of the following is a tough polymer that resists chemical and biological degradation?

a. sporopollenin b. gynoecium c. sporangium d. strobili

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