Which of the following statements about DNA is/are correct?
1. DNA is the hereditary material of all living organisms.
2. All segment 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:

Options

A. 1,2 and 3 only
B. 3 and 4 only
C. 1,3 and 4 only
D. 4 only

Answer

B

Explanation

Not all viruses have DNA e.g. HIV virus. It is double helical structure with two nucleotide chain which runs anti-parallel. DNA is also present in mitochondria. Only some segments of DNA code for proteins.