Stereocilia are important for the function of:
A. statocysts.
B. lateral line systems.
C. vestibular systems.
D. All of the answer options are correct.
D
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Which of the following organisms is the most common cause of urethritis?
A) Candida albicans B) Chlamydia trachomatis C) Neisseria gonorrhoeae D) Trichomonas vaginalis
Four of the five structures listed below are
adaptations to aid in dispersal of fruit. Select the exception. a. hooks b. spines c. smooth surfaces d. hairs e. sticky substances
Which of the following statements regarding the development of AIDS following infection with HIV is incorrect?
A. Antibodies to HIV antigens formed in response to HIV infection appear within a few weeks of infection and remain high through latency and AIDS. B. CD4 T cells are present in low numbers in an uninfected individual, but become elevated upon HIV infection, and ultimately fall to very low numbers (<200 cells/ml) as the infection progresses to AIDS. C. An HIV-positive individual in the latency phase can be distinguished from an uninfected individual by the presence of antibodies to HIV antigens in their blood. D. Viral antigens can be detected at high levels in the blood within days following infection, then their numbers fall dramatically during a latent period and rise again when AIDS symptoms occur.
Which of the following statements is NOT true concerning enzymatic activity?
a. Each enzyme has a preferred pH at which the enzyme reaction rate is highest. b. Above a certain temperature, an enzyme will become denatured. c. As the temperature increases, most enzymatic reactions will still proceed at the same rate. d. Enzymatic reactions proceed quite rapidly. e. Enzyme activity increases as substrate concentration increases until the maximum rate is achieved.