HIV can be transmitted through ________
a. unprotected sex with an infected partner only
b. infected mothers breast-feeding children only
c. all of the choices
d. the linings of the penis, vagina, mouth, and rectum only
c
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The term specific activity differs from the term activity in that specific activity:
A) is measured only under optimal conditions. B) is the activity (enzyme units) in a milligram of protein. C) is the activity (enzyme units) of a specific protein. D) refers only to a purified protein. E) refers to proteins other than enzymes.
(A)________ is the developmental process of forming three germ layer: ectoderm, mesoderm and endoderm. The ectoderm will differentiate into (B)_________________.
a. (A) gastrulation (B) skin and nervous system b. (A) gestation (B) skin and nervous system c. (A) gastrulation (B) muscle and bones d. (A) gestation (B) muscle and bones
Diatoms have a special problem
A. because they must await a chemical signal from a fish before they can become mobile and search for mating partners B. because their heavy siliceous shells impede conjugation C. because their + and - mating strains are nonmotile and have to be dispersed by currents D. because their two halves fit like the lid and body of a pillbox and on repeated cell divisions the half that is overlapped gets progressively smaller E. because the gametes experience difficulty in exiting the overlapping halves of their siliceous shells
For several years, scientists have warned doctors of the danger of overprescribing antibiotics, such as penicillin. Scientists are concerned because __________.
a. humans will become tolerant to the effects of drugs b. the organisms that produce many of the antibiotics are overexploited and could become extinct c. natural selection can lead to strains of microorganisms resistant to these drugs d. the drugs will be metabolized more quickly by our bodies, decreasing their effectiveness e. None of the listed responses are correct.