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D) He has at least one E allele

Explanation: The allele for detached earlobes E is dominant over the allele for attached earlobes e. Because E is a dominant gene, a boy who has detached earlobes must have at least one E allele. He can either have a genotype EE or Ee, the two genotypes will manifest outwardly as detached earlobes. Because E is dominant and is capable of expressing itself in the presence of a recessive gene e, the genotype Ee will also manifest outwardly as detached earlobes.

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.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.