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Question 20 4 pts MMC: For the lac operons below, choose the operons in which the genes (ZYA) would likely be expressed. TermOSPOZY A without lactose O IPOZY A with low levels of glucose OrPOCZY A with lactose O IPOZY A with lactose OPOZY A with lact

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Answer #1

The genes will not be expressed in the 1st case because supersuppressor would mask their expression even in the presence of lactose.

In the 2nd case, the genes will not be expressed as there is no mention of presence of lactose. The suppressor is wildtype, and hence will mask the genes' expression.

In the 3rd case, the genes will be expressed as the operator has constitutive mutation.

In the 4th case, the genes will be expressed as lactose is present. Lactose inhibits the function of suppressor protein by binding to it.

In the 5th case, expression will occur because the constitutive mutation in operator is dominant to supersuppressor mutation.

Hence, expression of the genes will be seen in (3), (4), and (5).

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