Which of the following bacteria are associated with enterotoxins?

A. Clostridium botulinum
B. Clostridium tetani
C. Neither Clostridium tetani nor Clostridium botulinum
D. Both Clostridium tetani and Clostridium botulinum


Answer: C. Neither Clostridium tetani nor Clostridium botulinum

Biology & Microbiology

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When considering the initiation of transcription, one often finds consensus sequences located in the region of the DNA where RNA polymerase(s) binds. Which of the following is a common consensus sequence?

A) TTTTAAAA B) satellite DNAs C) TATA D) any trinucleotide repeat E) GGTTC

Biology & Microbiology

Describe an experiment in which transgenic mice were used to identify the male-determining region of the Y chromosome

What will be an ideal response?

Biology & Microbiology

Tropical climates are warmer than temperate climates because

A. temperate climates are closer to the poles and the polar surfaces cause a reduction in heat gain. B. tropical climates have more vegetation and thus can absorb more heat. C. tropical climates receive the sun's rays at an almost perpendicular angle; since Earth is a sphere, the temperate climates receive the sun's rays at a much steeper incidence thus spreading the radiation over a broader area. D. tropical climates receive the sun's rays at a much steeper incidence thus spreading the radiation over a broader area and causing the tropics to be warmer while the temperate climates receive the sun's rays at an almost perpendicular angle, which causes some areas to be warm and other areas to be cold. E. temperate climates have more mountains and thus more snow causing the landmasses to warm slower.

Biology & Microbiology

What is the main component of an animal cell membrane?

A. glycolipids B. phospholipids C. cholesterol D. polynucleotides E. aquaporins

Biology & Microbiology