Question

Analysis of DNA of an organism revealed the following characters. Mark the option that is not likely to be true if the organism is a cat.

• A. The double helix is antiparallel & a linear molecule
• B. 20 bases comprising of a mixture of deoxyribonucleotide phosphates (dNTPs) were found in a single ${360}^o$ turn of helix
• C. 17 % of the nitrogenous bases were shown to be cysteines
• D. Uracil was lacking but guanine was 17 %

Answer 1

Answer: (C)

17 % of the nitrogenous bases were shown to be cysteines

The DNA double helix polymer of nucleic acid held together by nucleotides which base pair together. In B-DNA, the most common double helical structure found in nature, the double helix is right-handed with about 10–10.5 base pairs per turn. The double helix is antiparallel & a linear molecule and uracil are not present in DNA.

So the correct option is '17 % of the nitrogenous bases were shown to be cysteines'.