Catabolite repression:
A)cells save energy by not making uneeded enzymes
B)doesn't allow for cells to prioritize consumption of multiple substrates
C)allows cell growth to continue even after the preferred nutrient is used up
D)two of the above

Question

Quizplus · Accepted Answer

Catabolite repression is a regulatory system that ensures the most efficient use of substrates by a cell. It involves the repression of certain catabolic enzymes when preferred carbon sources (such as glucose) are available. This saves energy by not making unnecessary enzymes (A), and allows cell growth to continue even after the preferred nutrient is used up (C). Additionally, it doesn't allow for cells to prioritize consumption of multiple substrates (B), as it represses the expression of enzymes for utilizing alternate substrates until the preferred one is depleted. Therefore, option D, "two of the above," is correct.

Catabolite Repression