Which hair-like cellular projections line the respiratory tract and sweep inhaled particles away from the lungs?
a. flagella
b. cilia
c. intermediate filaments
d. pseudopods
e. microvilli
ANSWER: b
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An allosteric enzyme most clearly displays positive cooperativity when:
A. Km= K0.5. B. an increase in substrate increases the rate of reaction. C. a decrease in substrate concentration is observed soon after initiating the reaction. D. a minimal increase in modulator is associated with a large increase in V0. E. a minimal decrease in modulator is associated with a large increase in V0.
Darwin’s exposure to Lyell gave him insight on the ____
a. existing evidence from fossils b. record of catastrophic changes that encouraged evolution c. soundness of Lamarck's theories d. enormous lengths of time required for geologic events e. arguments for creationism
Microbial infection damages hosts by
A) toxins, exoenzymes, induction of immune response. B) attachment, invasion, endotoxin production. C) erythrocytes, phagocytes, disintegration. D) toxigenicity, autoimmunity, overactivity of immune system.
Which hormone causes a decrease in fat storage and an increase in synthesis of muscle proteins?
A. Growth hormone B. Oxytocin C. Prolactin D. Adrenaline E. Epinephrine