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Can you help me with the question in the attached image?

The arrow on the DNA molecule in the image shows the hydrogen bond between complementary nucleotides. DNA stands for deoxyribonucleic acid. This definition is important because it gives away the structure. The three main components of DNA are a base, phosphate, and sugar. A single unit of DNA is called a nucleotide. Every nucleotide has the same kind phosphate and sugar type. The base is what distinguishes one nucleotide from another.


The backbone of the double helix structure is composed of both the phosphate and the sugar. The sugar is called deoxyribose, and the phosphate is `PO_4^-3` . On the image attachment, this is represented by the pentagons and circles at the top and bottom. The pentagons represent deoxyribose molecules and the circles represent phosphates.


The two strands of DNA are connected by the bases in the middle. There are four bases: adenine, cytosine, guanine, and thymine. Adenine only bonds with thymine and cytosine only bonds with thymine. In the image attachment, this is represented by the interlocking rectangles in the center.

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