What kind of noncovalent interaction is typified by interactions between two molecules that are so close together that they can experience weak attractive forces bonding them together?
A) H bonds
B) hydrophobic interactions
C) ionic bonds
D) polar covalent bonds
E) van der Waals forces
Ans: E) van der Waals forces
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The letter "A" in the above figure represents
a. keratin-filled, dead epithelial cells. b. replicating epithelium. c. mucus produced by underlying ciliated cells. d. white blood cells attacking a bacterial cell. e. all of these
Microtubules have an outer diameter of
A) 7 nm. B) 8—12 nm. C) 25 nm. D) 7 mm. E) 25 mm.
RNA viruses replicate in the:
a. Cytoplasm b. Mitochondrion c. Endoplasmic reticulum d. Ribosomes e. Nucleus
Which of the following statements about the graph is true?
A. Oysters have high mortality rates late in life. B. Oysters live longer than Hydra. C. Humans and oysters have similar life spans. D. Humans have low mortality rates early in life. E. Hydra and humans have parallel life spans.