⇦ | ⇨ |
Select the two correct statements out of the four(a-d) give below about lac operon.
(i) Glucose or galactose may bind with the repressor and inactive it
(ii) In the absence of lactose the represor binds with the operator region
(iii) The z-gene codes for permease
(iv) This was elucidated by Francois Jacob and Jacque Monod.
The correct statements are:
Options
(a) (ii) and (iii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (ii)
Correct Answer:
(ii) and (iv)
Explanation:
Jacob and Monod proposed the lac operon of E. coli. The lac operon contains a promoter, an operator, and three strctural genes called z, y and a, coding for the enzyme, galactosidase, permease and transacetylase respectively. The lack regulator agene, designated as i gene, codes for repressor. In the absence of the inducer, the repressor binds to the lac operator, preventing RNA, polymerase from binding to the promoter and thus transcribing the structural gene.
Related Questions: - Hydrolic enzyme is secreted by
- The part of earth and atomosphere supporting life is
- The total gain of ATP from the break down of one molecule of glucose
- Which of the following protozoa is a flagellate?
- Which of the following is not the nitrogenous waste?
Topics: Genetics
(204)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Hydrolic enzyme is secreted by
- The part of earth and atomosphere supporting life is
- The total gain of ATP from the break down of one molecule of glucose
- Which of the following protozoa is a flagellate?
- Which of the following is not the nitrogenous waste?
Topics: Genetics (204)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply