Which one of the following is true?
A) Enzymes work generally on a broad range of substrates.
B) Enzymes emerge changed from the reactions they catalyze.
C) Enzymes are used up in chemical reactions.
D) An enzyme binds to its substrate at the enzyme's substrate site.
E) An enzyme's function depends on its three-dimensional shape.
balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is true?
A) The solution in the beaker is hypertonic relative to the solution in the balloon.
B) When placed in the beaker, the balloon will lose water by osmosis.
C) The solution in the balloon is hypertonic relative to the solution in the beaker.
D) When placed in the beaker, the balloon will experience neither a net gain nor a net loss of water.
E) The solution in the balloon is isotonic; the solution in the beaker is hypertonic.
Diffusion is an example of ______.
A) exocytosis
B) active transport
C) phagocytosis
D) passive transport
E) endocytosis
Diffusion ______.
A) is driven by an input of cellular energy
B) occurs when particles spread from areas where they are less concentrated to areas where they are more concentrated
C) requires an input of cellular energy
D) proceeds until equilibrium is reached
E) is the result of the potential energy of atoms
If a person eats one hard-boiled egg and digests the egg fully, cellular respiration will convert most of this energy into ______.
A) ATP
B) heat
C) carbon dioxide
D) water
E) sugars
