Enzymes directly act to ________.
A. speed up chemical reactions
B. supply energy
C. maintain cell structure
D. slow down chemical reactions
Answer: A
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Peripheral receptors stimulate the respiratory areas, resulting in
A) passive exhalation. B) decreased respiratory rate. C) respiratory collapse. D) increased respiratory rate.
Which of the following events occurs when erythrocytes are destroyed?
A. Urine output increases. B. Bile is manufactured by the gallbladder. C. Heme is transported by transferrin to the liver. D. The globin portion of the molecule is broken down into amino acids. E. Iron is secreted into the bile.
Emily is in labor with her first child. The amplitude-modulated system would show her oxytocin levels
A. to have a weak signal. B. to have a moderate signal. C. to have a strong signal. D. too weak to measure.
Which of the following processes could occur only through the plasma membrane of a living cell?
A) Simple diffusion B) Active transport C) Osmosis D) Facilitated diffusion E) Filtration