Diatoms are characterized by ____, and are the source of economically useful_____

a. calcium carbonate shells; ozone
b. calcium carbonate sheaths; petroleum
c. silica shells; diatomaceous earth
d. silica sheaths; limestone
e. silica carbonate shells; diatomaceous earth


ANSWER: c

Biology & Microbiology

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The leading strand is the daughter strand that has its ____ end pointed toward the replication fork and is therefore synthesized ______

A. 3'; in a series of segments B. 3'; continuously C. 5'; in a series of segments D. 5'; continuously E. None of the answer options are correct.

Biology & Microbiology

The interaction of sympathetic and

parasympathetic systems is best described as a. antagonistic. b. cooperative. c. overriding. d. synergistic. e. ineffective.

Biology & Microbiology

If DNA replication rejoined the 2 parental strands, it would be termed:a

dispersive. b. gradient. c. semiconservative. d. parental. e. conservative.

Biology & Microbiology

Female blue-footed boobies of the Galápagos Islands will mate only after a specific courtship display on the part of the male. The male high-steps to advertise his bright blue feet

What mechanism describes why the females do not mate with other species of boobies? A) Temporal isolation B) Ecological isolation C) Geographic isolation D) Mechanical incompatibility E) Behavioral isolation

Biology & Microbiology