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Q. No.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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Given below are two statements:
| Assertion (A): | RNA is a reactive molecule and can also work as catalyst. |
| Reason (R): | 2'OH group present at every nucleotide in RNA makes it liable and easily degradable. |
| 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 vs RNA as Genetic Material |
77%
From NCERT
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Given below are two statements:
| Assertion (A): | DNA can directly code for the synthesis of protein. |
| Reason (R): | DNA needs no intermediates to express the characters. |
| 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: Translation |
79%
From NCERT
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Given below are two statements:
| Assertion (A): | If both strands of DNA acts as a template, they would code for RNA molecule with different sequences. |
| Reason (R): | The sequence of amino acid coded by them in the proteins would be different. |
| 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: Transcription |
From NCERT
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Given below are two statements:
| Assertion (A): | If two RNA molecules are produced simultaneously, they would be complementary to each other and form a double stranded RNA. |
| Reason (R): | The double stranded RNA would never prevent it from being translated into protein. |
| 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: Transcription |
61%
From NCERT
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