Draw a hypothetical metabolic pathway composed of five substrates, five enzymes,

Draw a hypothetical metabolic pathway composed of five substrates, five enzymes, and a product called biological sciazine. number the substrates 1-5, and label the enzymes a-e, in order. (for instance, enzyme a catalyzes the reaction between substrates 1 and 2)

a. suppose a mutation made the gene for enzyme c nonfunctional. what molecule would accumulate in the affected cells?
b. suppose some individuals can survive if given substrate 5 in the diet, but they die if given substrates 1, 2, 3, and 4. which enzyme pathway is affected by this mutation?