Lactase is enzyme composed of a polypeptide hydrolyzes the disaccharide lactose to produce monarchies. the optimal ph for lactase activity is 6. transfer of lactase to ph 5 results in a substantial decrease in enzyme activity, likely due to the disruption of 1) only the primary structure of the enzyme. 2) the secondary and tertiary structure of the enzyme. 3) the primary and secondary structure of the enzyme. 4) the secondary, tertiary, and quaternary structure of the enzyme.

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition. b) one-fourth of the daughters of an affected man would have this condition. c) one-half of the daughters of an affected father and a carrier mother could have this condition. d) only if a woman is xxx could she have this condition.