A water molecule is polar because of ___.
A. transfer of electrons
B. unequal sharing of electrons
C. its ability to freeze
D. its hydrogen bonds
E. its change in density when frozen
Answer: B. unequal sharing of electrons
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The most common agent(s) causing subacute bacterial endocarditis is/are
A. Streptococcus pyogenes. B. Pseudomonas aeruginosa. C. normal skin or mouth microbiota. D. Escherichia coli.
Adaptations of the kangaroo rat to living in the dry,
hot environment of the southwestern United States include a. behavioral modifications that result in nocturnal activity patterns and daytime staying in burrows. b. a kidney that conserves body water better than that of humans. c. the ability to utilize water produced in the metabolism of carbohydrates. d. mechanisms that reduce evaporative water loss from the respiratory system. e. all of these.
Substances such as alcohol that promote the formation of urine are known as ________
A) renal stimulators B) diuretics C) hormones D) antidiuretics
In gel electrophoresis, DNA molecules move toward the ________ electrode because they have an overall ________ charge
A) negative; negative B) positive; positive C) negative; positive D) positive; negative E) negative and positive; neutral