It is believed that phototrophy arose approximately 3.3 billion years ago in

A) Bacteria.
B) Archaea.
C) Eukarya.
D) LUCA.


Answer: A

Biology & Microbiology

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Which type of vessel offers the most resistance to blood flow?

a. artery b. arteriole c. capillary d. venule e. vein

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An excitatory postsynaptic potential (EPSP) is

A. initiated by a depolarization of postsynaptic membrane. B. characterized by an accumulation of negative charges within the cell. C. triggered by opening Cl- channels. D. classified as a graded potential.

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The information storage molecules of cells are called:

A. enzymes. B. hormones. C. nucleic acids. D. proteins. E. phospholipids.

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A pesticide was found to cause cancer in laboratory mice. Which of the following would be the most reasonable hypothesis to pursue?

a. The pesticide mutates one oncogene to a proto-oncogene and one tumor suppressor gene to an inactive form. b. The pesticide mutates an oncogene to a proto-oncogene. c. The pesticide mutates both tumor suppressor genes to inactive forms. d. The pesticide mutates both oncogenes to proto-oncogenes.

Biology & Microbiology