Q. No.In the lac operon, the z gene codes for:
| 1. | transacetylase | 2. | the repressor of lac operon |
| 3. | permease | 4. | beta-galactosidase |
Subtopic: Gene Regulation: Lac Operon |
84%
Level 1: 80%+
NEET - 2026
Please attempt this question first.
Hints
Please attempt this question first.
The lactose present in the growth medium of bacteria is transported to the cell by the action of:
| 1. | Acetylase | 2. | Permease |
| 3. | Polymerase | 4. | Beta-galactosidase |
Subtopic: Gene Regulation: Lac Operon |
61%
Level 2: 60%+
NEET - 2024
Hints
Match List-I with List-II:
Choose the correct answer from the options given below:
1. A-III, B-IV, C-I, D-II
2. A-II, B-III, C-IV, D-I
3. A-IV, B-I, C-II, D-III
4. A-III, B-II, C-I, D-IV
| List-I | List-II | ||
| A. | Frederick Griffith | I. | Genetic code |
| B. | Francois Jacob & Jacque Monod | II. | Semi-conservative mode of DNA replication |
| C. | Har Gobind Khorana | III. | Transformation |
| D. | Meselson Stahl | IV. | Lac operon |
Choose the correct answer from the options given below:
1. A-III, B-IV, C-I, D-II
2. A-II, B-III, C-IV, D-I
3. A-IV, B-I, C-II, D-III
4. A-III, B-II, C-I, D-IV
Subtopic: Search for Genetic Material:I | Genetic Code: I | Gene Regulation: Lac Operon | Search for Genetic Material |
81%
Level 1: 80%+
NEET - 2024
Hints
In the lac operon, the i gene codes for:
1. Inducer
2. Repressor
3. \(\beta\)-galactosidase
4. Permease
1. Inducer
2. Repressor
3. \(\beta\)-galactosidase
4. Permease
Subtopic: Gene Regulation: Lac Operon |
64%
Level 2: 60%+
NEET - 2024
Hints
Given below are two statements :
In the light of the above statements choose the correct answer from the options given below:
1. Statement I is True but Statement II is False
2. Statement I is False but Statement II is True
3. Both Statement I and Statement II are True
4. Both Statement I and Statement II are False
| Statement I: | In the lac operon, the z gene codes beta-galactosidase which is primary responsible for the hydrolysis of lactose into galactose and glucose. |
| Statement II: | In addition of lactose, glucose or galactose can also induce lac operon. |
1. Statement I is True but Statement II is False
2. Statement I is False but Statement II is True
3. Both Statement I and Statement II are True
4. Both Statement I and Statement II are False
Subtopic: Gene Regulation: Lac Operon |
66%
Level 2: 60%+
NEET - 2024
Hints
Match List I with List II
Choose the correct answer from the options given below:
| List I | List II | ||
| A. | Gene 'a' | I. | \(\beta\)-galactosidase |
| B. | Gene 'y' | II. | Transacetylase |
| C. | Gene 'i' | III. | Permease |
| D. | Gene 'z' | IV. | Repressor protein |
Choose the correct answer from the options given below:
| Options: | A | B | C | D |
| 1. | III | I | IV | II |
| 2. | II | I | IV | III |
| 3. | II | III | IV | I |
| 4. | III | IV | I | II |
Subtopic: Gene Regulation: Lac Operon |
86%
Level 1: 80%+
NEET - 2023
Hints
Name the component that binds to the operator region of an operon and prevents RNA polymerase from transcribing the operon.
| 1. | Promotor | 2. | Regulator protein |
| 3. | Repressor protein | 4. | Inducer |
Subtopic: Gene Regulation: Lac Operon |
75%
Level 2: 60%+
NEET - 2023
Hints
Which one of the following acts as an inducer for lac operon?
| 1. | Sucrose | 2. | Lactose |
| 3. | Glucose | 4. | Galactose |
Subtopic: Gene Regulation: Lac Operon |
91%
Level 1: 80%+
NEET - 2023
Hints
In an E.coli strain i gene gets mutated and its product cannot bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome ?
1. RNA polymerase will bind the promoter region
2. Only z gene will get transcribed
3. z, y, a genes will be transcribed
4. z, y, a genes will not be translated
1. RNA polymerase will bind the promoter region
2. Only z gene will get transcribed
3. z, y, a genes will be transcribed
4. z, y, a genes will not be translated
Subtopic: Gene Regulation: Lac Operon |
Level 3: 35%-60%
NEET - 2022
Hints
In lac operon, z gene codes for :
1. \(\beta -\)galactosidase
2. Permease
3. Repressor
4. Transacetylase
1. \(\beta -\)galactosidase
2. Permease
3. Repressor
4. Transacetylase
Subtopic: Gene Regulation: Lac Operon |
92%
Level 1: 80%+
NEET - 2022
Hints
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