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Q. No.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 |
73%
From NCERT
NEET - 2023
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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
| I: | The process of copying genetic information from one strand of the DNA into RNA is termed as transcription |
| II: | A transcription unit in DNA is defined primarily by the three regions in the DNA i.e. a promoter, the structural gene and a terminator. |
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: Transcription |
87%
From NCERT
NEET - 2023
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Which scientist conducted an experiment with 32p and 35s labelled phages for demonstrating that DNA is the genetic material?
1. James D. Watson and F.H.C Crick
2. A.D. Hershey and M.J. Chase
3. F. Griffith
4. O.T. Avery, C.M. MacLeod and M. McCarty
1. James D. Watson and F.H.C Crick
2. A.D. Hershey and M.J. Chase
3. F. Griffith
4. O.T. Avery, C.M. MacLeod and M. McCarty
Subtopic: Search for Genetic Material |
82%
From NCERT
NEET - 2023
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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 correct but Statement II is incorrect.
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are correct
4. Both Statement I and Statement II are incorrect
| Statement I: | RNA being unstable, it mutates at a faster rate |
| Statement II: | RNA can directly code for synthesis of proteins hence can easily express the characters. |
1. Statement I is correct but Statement II is incorrect.
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are correct
4. Both Statement I and Statement II are incorrect
Subtopic: DNA vs RNA as Genetic Material |
85%
From NCERT
NEET - 2023
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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 |
89%
From NCERT
NEET - 2023
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With reference to Hershey and Chase experiments, select the correct statements:
Choose the most appropriate answer from the options given below:
| A: | Viruses grown in the presence of radioactive phosphorus contained radioactive DNA. |
| B: | Viruses grown on radioactive sulphur contained radioactive proteins. |
| C: | Viruses grown on radioactive phosphorus contained radioactive protein |
| D: | Viruses grown on radioactive sulphur contained radioactive DNA |
| E: | Viruses grown on radioactive protein contained radioactive DNA |
| 1. | (D) and (E) only | 2. | (A) and (B) only |
| 3. | (A) and (C) only | 4. | (B) and (D) only |
Subtopic: Search for Genetic Material |
83%
From NCERT
NEET - 2023
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The salient features of genetic code are:
(A) The code is palindromic
(B) UGA act as initiator codon
(C) The code is unambiguous and specific
(D) The code is nearly universal
Choose the most appropriate answer from the options given below:
(A) The code is palindromic
(B) UGA act as initiator codon
(C) The code is unambiguous and specific
(D) The code is nearly universal
Choose the most appropriate answer from the options given below:
| 1. | (A) and (D) only | 2. | (B) and (C) only |
| 3. | (A) and (B) only | 4. | (C) and (D) only |
Subtopic: Genetic Code |
75%
From NCERT
NEET - 2023
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Given below are two statements:
| Assertion (A): | Each strand from a DNA acts as a template for synthesis of a new strand. |
| Reason (R): | Two daughter DNA produced by replication are identical to the parental DNA molecule. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: DNA Replication |
From NCERT
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Given below are two statements:
| Assertion (A): | Beta-galactosidase synthesised by E. coli catalyses lactose. |
| Reason (R): | E. coli does not synthesises the enzymes permease if lactose is present in the medium. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Gene Regulation: Lac Operon |
70%
From NCERT
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Given below are two statements:
| Assertion (A): | Lactose is the substrate for the enzyme beta-galactosidase. |
| Reason (R): | Lactose regulates switching on and off of the operon and acts as inducer. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Gene Regulation: Lac Operon |
65%
From NCERT
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