The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________.

In photosynthesis, plants use carbon from __________ to make sugar and other organic molecules.

In photosynthesis, _________ is oxidized and _________ is reduced.a. water . . . oxygenb. carbon dioxide . . . waterc. water . . . carbon dioxided. glucose . . . carbon dioxide

What are the reactants and products of cellular respiration?

Which of the following statements is a correct distinction between autotrophs and heterotrophs?a. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.b. Only heterotrophs require chemical compounds from the environment.c. Cellular respiration is unique to heterotrophs.d. Only heterotrophs have mitochondria.

Select the true statement regarding metabolism in plant and animal cells.a. Plant and animal cells both perform photosynthesis and aerobic respiration;b. Animal cells perform aerobic respiration only, and plant cells perform photosynthesis only;c. Plant cells perform aerobic respiration only, and animal cells perform photosynthesis only;d. Plant cells perform cellular respiration and photosynthesis, and animal cells perform aerobic respiration only.