Based on the illustration, explain what happens to most of the mass gained by the plant cell through photosynthesis?
A) The mass is returned to the soil.
B) The reactants of photosynthesis are used as the reactants of respiration.
C) The products of photosynthesis are shuttled back into the photosynthesis reaction as reactants.
D) The mass produced by the photosynthesis reaction is used by the plant to fuel respiration and is turned into carbon dioxide, water, and energy.

Which of the following characteristics are true of enzymes? check all that apply. a.)the structure of an enzyme can change if conditions change. b.)a single enzyme can normally catalyze a wide variety of reactions under many conditions. c.)enzymes are found only in nonliving systems. d.)enzymes allow living things to regulate body conditions through feedback mechanisms. e.)enzymes bind to specific substrates in specific ways. f.)enzymes increase the rate of reaction. g.)when shown in energy-reaction diagrams, enzymes represent the higher activation energy.