Question

1p Question 62 Which functional structural proteins will be produced by the following operon genotype when substance Z is absent? Select all that apply. testR-testP+ testO+ testA+ testB-testC+ testo testP testc testB nothing testa 1 pts

Answer 1

Answer 62) test A, test C.

test R- gene does not encode repressor. That's why test O+ remains functional. It will allow RNA polymerase to bind to the test p+ ( promoter).The polymerase proceeds further and leads to the expression of wild type structural genes i.e.A and C genes. But B gene will not express due to test B-.

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Answer 63) test A, test C.

test R- gene does not encode repressor. That's why test O+ remains functional. It will allow RNA polymerase to bind to the test p+ ( promoter).The polymerase proceeds further and leads to the expression of wild type structural genes i.e.A and C genes. But B gene will not express due to test B-.

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Answer 64) test B , test C.

O^c encodes constitutive operator. The C+ and B+ gene will express. Whereas A gene will express in inducible manner. In absence of Z, the repressor binds to the testO on lower strand. And there will be not found expression of A gene.

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Answer 65) testA, test B, test C.

O^c encodes constitutive operator. The C+ and B+ gene will express. Whereas A gene will express in inducible manner. In presence of Z, the Z binds to repressor. It becomes inactive in nature. Repressor can not bind to the testO on lower strand. And there will be found expression of A gene.

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