The small circular molecules of DNA commonly found in bacteria are called ________

A) chromatids
B) plastids
C) chromophores
D) plasmids


D

Biology & Microbiology

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The distribution of the genetic disorder called sickle-cell anemia is correlated with the distribution of

malaria in tropical countries. This is an example of

a. heterozygote advantage. b. frequency-dependent selection. c. a genetic bottleneck. d. genetic drift. e. evolutionary convergence.

Biology & Microbiology

All microscopes have objective "lenses."

a. True b. False

Biology & Microbiology

Which one of the following is directly involved in the process of blood clotting?

A) sodium ions B) antigen C) fibrin D) clotting factor XX E) globulins

Biology & Microbiology

What is true about the half-life of 14C?

A. The half-life never changes over time. B. It takes 5,730 years for half of 14C to be converted to 14N. C. It can be employed in the radioisotopic dating of fossils. D. All of these are correct.

Biology & Microbiology