Enzyme 1 Enzyme 2 Enzyme 3 Enzyme 4 Above is a metabolic pathway for the synthes

Question

Enzyme 1 Enzyme 2 Enzyme 3 Enzyme 4 Above is a metabolic pathway for the synthesis of an amino acid (E), without which an organism could not live. Enzymes are represented by numbers, and substrates by letters. According to the figure above, if enzyme 3 was nonfunctional in an organism, which of the following outcomes would you predict? a) Lack of enzyme 3 would result in a cessation (halt) of the entire metabolic pathway. b) The cell would die because of a lack of the essential amino acid c) Substrate C would accumulate, and there would be no substrate D formed. d) Another enzyme would be able to catalyze the reaction and the pathway would proceed.

Explanation / Answer

Ans.1 - (c)

If enzyme 3 was non-functional than there would be accumulation of substrate C and no substrate D would be formed.

however it would not lead to the cessation of entire metabolic pathway as long as the initial substrate A is available because other enzymes are still functional. also,the cell might survive if it is able to obtain the essential amino acid from the its surroundings.

Ans. 2 - (C)

The allele with the dominant phenotype does not inhibit the transcription of the allele for the recessive phenotype but the product of the allele with the dominant phenotype masks the phenotype of the recessive allele.

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