Which element of the lac operon can act in cis or trans ? the operator sequence
ID: 178280 • Letter: W
Question
Which element of the lac operon can act in cis or trans?
the operator sequence
the IacI gene product
the structural genes Y, Z, and A
the promoter region
the CAP-binding site sequence
both the operator and promoter sequences can act in either cis or trans
both CAP binding site sequence and the lacI gene product can act in either cis or trans
a.the operator sequence
b.the IacI gene product
c.the structural genes Y, Z, and A
d.the promoter region
e.the CAP-binding site sequence
f.both the operator and promoter sequences can act in either cis or trans
g.both CAP binding site sequence and the lacI gene product can act in either cis or trans
Explanation / Answer
The following elements of the lac operon can act in cis or trans:
b. the IacI gene product
e. the CAP-binding site sequence
g. both CAP binding site sequence and the lacI gene product can act in either cis or trans
Most opf the DNA sequences act only in cis whersas the proteins or the products which are diffusible act in trans. The cis acting elements cannot be complemented. The trans acting elements can be complemented. In the above options, The operator sequence, structural gene Y,Z,A, The promoter sequence act in cis. The lacI gene prouct, CAP-binding site sequence can act in either cis or trans.
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