Question

Which statement does NOT describe DNA structure?

The phosphates and sugars of the nucleotides form the “backbone” of the double helix.

The two complementary strands are held together by hydrogen bonds.

The nitrogen bases of the nucleotides project towards the center of the helix.

The 5-carbon sugar in each nucleotide is ribose.

Answer 1

The answer is 4 th option - the 5-carbon sugar in each nucleotide is ribose

DNA (Deoxyribonucleic acid) is a nucleic acid composed of nucleotides. A DNA molecule is consists of two strands that form a twisted structure called the double helix.  A nucleotide contains a phosphate group, a 5-carbon sugar molecule, and nitrogenous bases. The 5- carbon sugar molecule found in DNA is deoxyribose. The phosphate group and sugar (deoxyribose) found at the sides (outside) of the double helix is the backbone. The nitrogenous bases of DNA are Adenine, Thymine, Guanine, and Cytosine are found in the middle of the double helix and they are found in pairs like steps of the twisted ladder. Adenine binds with Thymine and Guanine binds with cytosine. Base pairs are bound by hydrogen bonds. DNA strands are complementary to each other and held together by hydrogen bonds between the base pairs.

The 5 carbon sugar molecule in the nucleotide of DNA is deoxyribose. Ribose is the 5 carbon sugar molecule found in the nucleotide of RNA.

Hence, the answer is 4th option