________ 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
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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
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
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.
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