Which statement describes how enzymes and substrates are related?

a) the enzyme influences the speed of change from substrate to product.

b) enzymes are released as substrates in a chemical reaction.

c) an enzyme is a special kind of substrate in a chemical reaction.

d) substrates combine with enzymes to form reactants.

Yes the answer is A. got it correct.

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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.