An animal adapted to life in a coastal environment where fresh water enters the ocean:a
would have excretory structures to remove excess salt.
b. would have excretory structures to remove excess water.
c. would drink large amounts of water.
d. would likely be an osmoregulator.
e. More than one of these.
E
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Which level of protein structure do the ?-helix and the ?-pleated sheet represent?
A) primary B) secondary C) tertiary D) quaternary E) primary, secondary, tertiary, and quaternary
Secondary phloem
A. includes live companion cells and dead sieve cells. B. encompasses more stem volume than secondary xylem. C. primarily stores carbohydrates. D. is part of the inner bark. E. is produced by the cork cambium.
When a small amount of hydrochloric acid (HCl) is added to a solution of Na2HPO4, the pH of the solution does not
change markedly. The pH also does not change drastically when a small amount of sodium hydroxide (NaOH) is added to this same solution. Based on these observations, the compound Na2HPO4 is: a. acting as a buffer. b. acting as a solvent. c. able to donate hydrogen atoms to HCl. d. able to remove hydrogen ions from the OH? of NaOH. e. an enzyme facilitating the reaction between HCl and NaOH.
Which is a true statement about the ATP cycle?
A. The ATP cycle does not involve ADP. B. The ATP cycle can operate independently of enzyme help. C. About 100 ATP molecules are regenerated per second per cell. D. A single muscle cell needs only about one minute to recycle all of its ATP.