The central dogma of molecular biology is an explanation of the flow of genetic information within a biological system. 
Statement I: A is ‘replication’ where DNA is replicated in a semi-conservative manner.
Statement II: B is ‘transcription’ and is so called because the language of RNA is only a slight variant of the language of the DNA.
Statement III: C is ‘translation’ and is so called because the language of Protein is entirely different from the language of RNA.
 
1.  Statement I is correct, Statement II is incorrect, Statement III is incorrect
2. Statement I is correct, Statement II is correct, Statement III is incorrect
3. Statement I is correct, Statement II is correct, Statement III is correct
4. Statement I is incorrect, Statement II is incorrect, Statement III is incorrect

Subtopic:  DNA Double Helix |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A set of positively charged and basic proteins are used in the packaging of Eukaryotic DNA.
Reason (R): DNA molecule is acid and carries a negative charge.
In the light of the above statements, choose the most appropriate answer from the options given below :
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 Packaging |
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The structure of nucleosome is shown below:
 
I: A is H1 histone.
II: B is a tetramer made of histone proteins.

1. Statement I is correct, Statement II is incorrect.
2. Statement I is incorrect, Statement II is correct.
3. Statement I is incorrect, Statement II is incorrect.
4. Statement I is correct, Statement II is correct.
Subtopic:  DNA Packaging |
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The given figure shows the Electron Microscope ‘beads-on-string’ structure of:

 
1. Nucleosome 2. Solenoid
3.  Filament 4. Metaphase chromosome
Subtopic:  DNA Packaging |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Euchromatin is said to transcriptionally active protein.
Reason (R): Heterochromatin is said to be transcriptionally inactive.
In the light of the above statements, choose the most appropriate answer from the options given below :
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. (A) is true but (R) is false.
3. Both (A) and (R) are true but (R) is not the correct explanation of (A).
4. Both (A) and (R) are false.
Subtopic:  DNA Packaging |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): S-strain of Streptococcus pneumoniae is virulent.
Reason (R): Heat-killed S-strain Streptococcus pneumoniae injected into mice did not cause pneumonia and did not kill them.
In the light of the above statements, choose the most appropriate answer from the options given below :
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. (A) is true but (R) is false.
3. Both (A) and (R) are true but (R) is not the correct explanation of (A).
4. Both (A) and (R) are false.
Subtopic:  Search for Genetic Material |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In Avery, Macleod, and McCarty's experiment, digestion of heat-killed lysate with proteases and RNases did not affect transformation but digestion with DNase did.
Reason (R): DNase will hydrolyse all biomolecules in the lysate except DNA.
In the light of the above statements, choose the most appropriate answer from the options given below :
1. (A) is True but (R) is False.
2. Both (A) and (R) are True and (R) is the correct explanation of (A).
3. Both (A) and (R) are True but (R) is not the correct explanation of (A).
4. Both (A) and (R) are False.
Subtopic:  Search for Genetic Material |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Even after the results of Avery, Macleod, and McCarty's experiment, not all biologists were convinced that DNA is hereditary material.
Reason (R): Proteins were conclusively proved to be the genetic material for almost all living organisms.
In the light of the above statements, choose the most appropriate answer from the options given below :
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are false.
3. Both (A) and (R) are true but (R) is not the correct explanation of (A).
4. (A) is true but (R) is false.
Subtopic:  Search for Genetic Material |
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Study the illustration of the basic steps of the Hershey-Chase experiment and select the correct statements from the given experiments:
 
I. ‘A’ shows that viruses grown on radioactive sulfur contained radioactive protein but not radioactive DNA because DNA does not contain sulfur.
II. ‘B’ shows that viruses are grown in the presence of radioactive phosphorus contained radioactive DNA but not radioactive protein because DNA contains phosphorus but protein does not. 
III. The result ‘X’ shows bacteria that were infected with viruses that had radioactive DNA were radioactive, indicating that DNA was the material.
IV. The result ‘Y’ shows bacteria that were infected with viruses that had radioactive proteins were not radioactive indicating that proteins did not enter the bacteria from the viruses.
    
1. Only Statement I and Statement II.
2. Only Statement I and Statement III.
3. Only Statement I and Statement IV.
4. Only Statement III and Statement IV.
Subtopic:  Search for Genetic Material |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A molecule that can act as a genetic material should be able to express itself in the form of ‘Mendelian Characters’.
Reason (R): A molecule that can act as a genetic material should provide the scope for slow changes.
In the light of the above statements, choose the most appropriate answer from the options given below :
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. Both (A) and (R) are false.
4. (A) is true but (R) is false.
Subtopic:  DNA vs RNA as Genetic Material |
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