_ 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:

DNA is the hereditary material in humans and almost all other organisms, serving as the blueprint for body design and inheritance [4]. Statement 2 is incorrect because only a small fraction of the human genome (about 1-5%) consists of protein-coding genes, while the remaining 95-99% comprises non-coding sequences [1]. Nuclear DNA is characterized by a double helical structure consisting of two nucleotide chains that run anti-parallel to each other [4]. Furthermore, while most DNA is located in the cell nucleus, a small amount is also found in the mitochondria, known as mitochondrial DNA (mtDNA), which contains its own set of genes [4]. Therefore, statements 1, 3, and 4 are correct, making option 3 the right choice.

Sources

1. [1] https://www.sciencedirect.com/topics/social-sciences/genome
2. [4] https://medlineplus.gov/genetics/understanding/basics/dna/
3. [2] https://www.sciencedirect.com/topics/neuroscience/dna-strand