Which of the following is true about the structure of DNA? - ProProfs Discuss
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Which of the following is true about the structure of DNA?



A. Short strands of DNA are contained in chromosomes inside the nucleus of a cell.
B. Every DNA nucleotide contains a sugar, a phosphate group, and a nitrogen base.
C. DNA consists of one strand of nucleotides joined by hydrogen bonds.
D. The long strands of nucleotides are twisted into a double helix.

This question is part of GENETICS AND DNA QUIZ YR 10 SCIENCE
Asked by Aponator, Last updated: May 21, 2019

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2 Answers

A. Lucius

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A. LuciusSenior Content writer, Diploma in Literature, Dover, Delaware
Senior Content writer, Diploma in Literature, Dover, Delaware

Answered on Nov 01, 2019

The correct answer to this question is option B – Every DNA nucleotide contains a sugar, a phosphate group, and a nitrogen base. DNA is the acronym for Deoxyribonucleic acid. It is the material that carries genetic information in living organisms. DNA is a double-helical structure. It is made of two strands that are tightly joined by hydrogen bonds. DNA nucleotides are made from deoxyribose sugar, a phosphate group, and one of the following nitrogenous bases - adenine, guanine, cytosine, and thymine.

DNA is held together by proteins called histones, and they are contained in chromosomes present inside the nucleus of a cell. Option A is incorrect because both short and long DNA is contained in chromosomes inside the nucleus. Option C is incorrect because DNA consists of two strands, not one strand, and they are joined by hydrogen bonds. Option D is incorrect because irrespective of the length of DNA, they are always twisted into a double helix.

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aponator

Aponator

Answered on Feb 20, 2018

DNA consists of one strand of nucleotides joined by hydrogen bonds.
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