Question

question 6
please match the correct term to the item

• lac y a. permease
• controls the transcription of the lac operon b. helicase

c. operator

• prevents rna polymerase from binding if glucose is present d. repressor

e. translation

• this binds to the operator when no lactose is present f. promoter

g. rna polymerase

• this transcribes the polycistronic genes when the operon is induced h. transacetylase

i. cap/camp
j. allolactase

Explanation:

• Lac Y encodes permease, a protein that transports lactose into cells.
• The operator is the DNA sequence that controls Lac operon transcription by binding repressor.
• CAP/cAMP is inactive when glucose is present, preventing RNA polymerase binding (catabolite repression).
• Repressor binds the operator in the absence of lactose, blocking transcription.
• RNA polymerase transcribes polycistronic lacZ, lacY, lacA genes when the operon is induced.

Answer:

Lac Y: A. Permease
controls the transcription of the Lac operon: C. operator
prevents RNA polymerase from binding if glucose is present: I. CAP/cAMP
This binds to the operator when no lactose is present: D. repressor
This transcribes the polycistronic genes when the operon is induced: G. RNA polymerase