________ is used to control transcription of some anabolic pathways involved in amino acid biosynthesis.

A. Induction
B. Attenuation
C. Catabolite repression
D. All of the choices are correct.


Answer: B

Biology & Microbiology

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Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours. Polio has been virtually eliminated world-wide by which of the following?

a. Antibiotics b. Vaccination c. Mosquito control d. Quarantine e. Improve water quality

Biology & Microbiology

How many species normally go extinct each year, as estimated by scientists?

A) 1 species per thousand per year B) 1 species per million per year C) 1 species per billion per year D) 1 species per year

Biology & Microbiology

Some flowering plants cannot self-pollinate. This increases their tendency to mate with phenotypically different mates, a process called disassortative mating. What effect would this have on a population in Hardy-Weinberg equilibrium?

A. An increase in heterozygotes would be observed. B. An increase in homozygotes would be observed. C. No change homozygotes or heterozygotes would be observed. D. A decrease in heterozygotes would be observed. E. The population would remain in Hardy-Weinberg equilibrium.

Biology & Microbiology

Crossing over in prophase I and ________ in metaphase I increase the genetic variation from one generation to another

Fill in the blank(s) with correct word

Biology & Microbiology