Thymine dimers are caused by

A) X-rays.
B) active oxygen species.
C) a mutagen such as ethylmethane sulfonate (EMS).
D) depurination.
E) UV light.


E) UV light.

Biology & Microbiology

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In the hydrologic cycle, water moves from the land to the air by ____ and returns to the land via ____

a. precipitation; evaporation and transpiration b. precipitation and evaporation; transpiration c. precipitation and transpiration; evaporation d. transpiration; precipitation and evaporation e. transpiration and evaporation; precipitation

Biology & Microbiology

Protective layers outside the bacterial cell membrane include:

a. cell walls only b. capsules only c. envelopes only d. cell walls and plasmids e. cell walls and capsules

Biology & Microbiology

Which latitude will have the most hours of daylight on the summer solstice?

a. 0º (the equator) b. 30º north c. 45º north d. 60º north

Biology & Microbiology

Which of the following is not true of the Chloroplastida (green algae)?

A. They have chlorophylls a and b. B. They store carbohydrates as starch. C. They are found in fresh and salt water. D. Their cell walls contain chitin.

Biology & Microbiology