Suppose that you are studying an inducible operon that contains two genes required for the metabolism of compound xyz. Gene A encodes enzyme A, and gene B encodes enzyme B. When compound xyz is absent, the operon is repressed, but when compound xyz is present, the operon is induced. You have isolated four distinct mutants, numbered 1, 2, 3, and 4, which have the effects shown in the table below, where + indicates that the enzyme is synthesized and - indicates that the enzyme is not synthesized. Required:Identify the component of the operon that is mutated in each mutant. xyz absent xyz present Enzyme A Enzyme B Enzyme A Enzyme BWild Type - - + +Mutant 1 - - - +Mutant 2 + + + + Mutant 3 - - + - Mutant 4 - - - -

the answer is b: 1.4 km/hr

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.

equal distribution i think.