Which of the following respiratory tract defenses is mismatched?
A. Ciliary escalator - first line of defense
B. IgA antibody - third line of defense
C. Mucous membranes - third line of defense
D. Nasal hairs - first line of defense
E. Complement - second line of defense
Answer: C
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One of the limiting factors in engineering plants for nitrogen fixation is to prevent the binding of ________ to the enzyme nitrogenase and the subsequent inhibition of the enzyme.
A. calcium B. bacteria C. oxygen D. phosphorus E. cell membranes
As muscles contract, ________
a. actin heads bind to myosin filaments and slide them toward the middle of the sarcomere b. myosin heads bind to actin filaments and slide them toward the middle of the sarcomere c. myosin filaments change position d. filaments change length
What affect does ADH secretion have on the kidneys?
A) Water stays trapped in the kidney tubules. B) Urine output increases. C) The filtration rate increases. D) Blood pressure to the kidneys decreases. E) Water moves out of the kidney tubules.