An enzyme known as amylase is found in the saliva of humans. this enzyme to begin the process of digesting starch molecules in the foods we eat. which of these best describes how enzymes like amylase in the process of digestion? a) amylase acts as a buffer to keep the ph of foods at a consistent level. b) amylase breaks down the food molecules directly by forming powerful acids. c) amylase is a catalyst that speeds up the chemical process of breaking down food molecules. d) amylase contains the dna molecules necessary to assemble the proteins needed for digestion. eliminate

C,the answer is C because enzymes are catalysts,they help speed up reactions.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.