Question

What is DNA’s structure described as?

a) Single-stranded helix
b) Double-stranded helix
c) Branched chain
d) Ring structure

Answer 1

The correct answer is b) Double-stranded helix. DNA has a structure called a double helix, which means that it consists of two strands that twist around each other like a spiral staircase. The two strands are held together by hydrogen bonds between complementary bases: adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).

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Answer 2

DNA is known for its characteristic double-stranded helix structure, with two polymers made up of nucleotides that are connected by hydrogen bonds between adenine-thymine and cytosine-guanine base pairs.

Thus option b) Double-stranded helix. is correct answer.

Step-by-step explanation:

DNA's structure is described as a double-stranded helix, which resembles a twisted staircase. In this intricately structured molecule, two polymers of nucleotides are intertwined.

Phosphate and sugar groups form the backbone of each strand and are connected through phosphodiester bonds, while nitrogenous bases adenine, thymine, cytosine, and guanine pair up between these strands, held together by hydrogen bonds.

DNA's three-dimensional shape is stabilized through these interactions, distinctly forming a helix that is double-stranded. This structure is important for DNA's role in genetics, as it allows DNA to replicate and to be read to produce RNA during transcription, a crucial step in protein synthesis.

Thus option b) Double-stranded helix. is correct answer.