It is believed that phototrophy arose approximately 3.3 billion years ago in
A) Bacteria.
B) Archaea.
C) Eukarya.
D) LUCA.
Answer: A
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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
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.
The information storage molecules of cells are called:
A. enzymes. B. hormones. C. nucleic acids. D. proteins. E. phospholipids.
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.