When was the Carboniferous period?

a. about 17 million years ago
b. about 125 million years ago
c. about 250 million years ago
d. about 1.5 billion years ago


Answer: c. about 250 million years ago

Biology & Microbiology

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The primary elements making up living organisms are

A. carbon, hydrogen, iron, sulfur, sodium, and calcium. B. carbon, hydrogen, oxygen, sulfur, nitrogen, and phosphorus. C. carbon, hydrogen, oxygen, calcium, iron, and iodine. D. carbon, oxygen, iron, chlorine, sulfur, and phosphorus. E. carbon, oxygen, sulfur, calcium, iron, and phosphorus.

Biology & Microbiology

Baroreceptors are located in the

a. coronary arteries. b. cardiac veins. c. pulmonary arteries. d. carotid arteries. e. pulmonary veins.

Biology & Microbiology

Which of the following statements concerning enzymes is FALSE?

a. Each enzyme has an optimal temperature. b. Each enzyme has an optimal pH. c. Most enzymes are highly specific. d. Some enzymes require cofactors. e. Most enzymes are RNA molecules.

Biology & Microbiology

Which of the following is a transfer of genes between non-homologous chromosomes?

A) Translocation B) Inversion C) Duplication D) Deletion

Biology & Microbiology