Assertion (A) >: Scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules. Reason (R) >: DNA fragments can be manipulated using restriction endonucleases and DNA ligases.

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Q: 124 (IAS/2001)

Assertion (A): Scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules.
Reason (R): DNA fragments can be manipulated using restriction endonucleases and DNA ligases.

question_subject: 

Science

question_exam: 

IAS

stats: 

0,55,29,55,13,7,9

keywords: 

{'dna fragments': [0, 0, 1, 0], 'dna molecules': [0, 0, 1, 0], 'dna ligases': [0, 0, 1, 0], 'restriction endonucleases': [0, 0, 1, 0], 'molecules': [0, 0, 1, 1], 'scientists': [2, 2, 8, 11]}

The correct answer is:

Both A and R are individually true and R is the correct explanation of A.

Assertion (A) states that scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules, which is true. Through various techniques and tools, scientists can manipulate DNA molecules, including cutting them into fragments and joining them together.

Reason (R) provides an explanation for Assertion (A). It states that DNA fragments can be manipulated using restriction endonucleases and DNA ligases, which is also true. Restriction endonucleases are enzymes that can recognize specific DNA sequences and cut the DNA at those locations. DNA ligases, on the other hand, are enzymes that can join DNA fragments by catalyzing the formation of phosphodiester bonds between them.

Together, Assertion (A) and Reason (R) are both true, and Reason (R) correctly explains Assertion (A). Therefore, the correct option is:

Both A and R are individually true, and R is the correct explanation of A.

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