Carbon fixation {Ans: Occurs when carbon atoms from CO2 are incorporated into an organic molecule}Which level in the hierarchy shown is a community? a. level C, All organisms in the dessert b. level B, Dessert c. level A, All environments on earth supporting life d. LEVEL E, All of the choices are correct. e. level D, Group of lizards {Ans: level C, All organisms in the dessert}Photophosphorylation during photosynthesis differs from oxidative phosphorylation during cellular respiration in that a. it involves an electron transport chain. b. energy is stored in the form of a proton concentration difference. c. regeneration of ATP is driven by a flow of protons through an ATP synthase. d. the final electron acceptor is NADP+ and not oxygen. {Ans: the final electron acceptor is NADP+ and not oxygen.}A major function of glycoproteins and glycolipids in the cell membrane is to {Ans: Allow the cells of an embryo to sort themselves into tissues and organs}Photoautotrophs {Ans: Produces organic molecules from inorganic molecule}Autotrophs that utilize light as their energy source are a. chemosynthetic autotrophs. b. photoautotrophs. c. fungi. d. heterotrophs. {Ans: photoautotrophs.}