_ Which of the following statements about DNA is/are correct ? 1. DNA is the hereditary material of all living organisms. . 2. All segments of DNA code for synthesis of proteins. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-p

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Q: 32 (NDA-I/2016)
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Which of the following statements about DNA is/are correct ?
1. DNA is the hereditary material of all living organisms. .
2. All segments of DNA code for synthesis of proteins.
3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.
4. DNA is also found in mitochondria.
Select the correct answer using the code given below:

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,6,90,34,6,50,6

keywords: 

{'dna code': [0, 0, 0, 1], 'nuclear dna': [0, 0, 0, 1], 'dna': [3, 1, 1, 2], 'nucleotide chains': [0, 0, 0, 1], 'mitochondria': [2, 0, 1, 2], 'hereditary material': [0, 0, 0, 1], 'synthesis': [4, 0, 0, 9], 'proteins': [1, 1, 0, 0]}

The correct answer is option 2: 3 and 4 only

Let`s dissect each option to better understand why this is the correct answer:

Option 1: 1, 2, and 3 only: This option states that DNA is the hereditary material of all living organisms (which is correct), all segments of DNA code for synthesis of proteins (which is incorrect, as not all segments of DNA code for proteins. Some segments are non-coding or have regulatory functions), and nuclear DNA is double helical with two nucleotide chains that run anti-parallel (which is correct).

Option 2: 3 and 4 only: This option states that nuclear DNA is double helical with two nucleotide chains that run anti-parallel (which is correct) and DNA is also found in mitochondria (which is correct, as mitochondria have their own DNA).

Option 3: 1, 3, and 4 only: This option states that DNA is the hereditary material of all living organisms (which is correct), nuclear DNA is double helical with two nucleotide chains that run anti-parallel (which is correct), and DNA is also found in mitochondria (which is correct). This option includes all the correct statements.

Option