________ are organic compounds that the body needs for metabolic purposes but is unable to produce for itself.
a) carbohydrates
b) lipids
c) vitamins
d) proteins
Ans: c) vitamins
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Predict which of the following would happen if a plant was exposed to a toxin that made the thylakoid membranes permeable to hydrogen ions
A. The hydrogen ion gradient across thylakoid membrane would be eliminated. B. The hydrogen ions necessary to generate NADPH from NADP+ would no longer be present. C. The oxidation and reduction of the protein complexes in the electron transport would be prevented. D. A reversal of the hydrogen ion gradient across the thylakoid membrane would result in a higher pH in the thylakoid lumen than in the surrounding stoma.
Exergonic reactions
A. occur when there is more free energy in the products than the reactants. B. occur when there is more free energy in the reactants than the products. C. are defined as a decrease in entropy. D. are chemoorganotrophic.
Plants and animals that rely on diffusion to move molecules through their bodies tend to ________
a. be large b. have respiratory and vascular systems c. be small and flat d. evolve few adaptations because diffusion is a passive process
Which statement best describes a cell membrane?
a. it is found only found in animal cells b. it is a non living structure c. it controls reproduction in a cell d. it controls the passage of materials into the cell