A cell uses centrioles in the process of
A. RNA replication.
B. protein synthesis.
C. nuclear centering.
D. cell division.
E. energy generation.
Answer: D
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Oil spilled into the ocean does not easily disperse, but rather clumps into an oil slick. Which of the following explains why this occurs?
A. Oil is composed mainly of hydrophilic molecules. B. Oil is composed mainly of nonpolar molecules. C. Oil has no hydrogen in its molecular structure, so it can't form hydrogen bonds with water. D. Water is hydrophobic. E. Electrons are shared unequally between carbon and hydrogen atoms.
Explain the differences between channel proteins and carrier proteins and why cells need both.
What will be an ideal response?
Which of the following promotes elastic recoil of the lungs?
a. elastic fibers in the lung. b. surface tension of the fluid lining the alveoli. c. pulmonary surfactant. d. both (a) and (b) above. e. all of these answers.
Which of the following is NOT a secondary lymphatic duct?
a) spleen b) lymphatic nodule c) lymph node d) red bone marrow