Which of these statements is not true about DNA?

It is the genetic material of the cell

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Adenine pairs with thymine and guanine pairs with .cytosine

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It contains the sugar ribose

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Sugar and phosphate groups form the backbone of the molecule

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Solution

The correct option is C It contains the sugar ribose
DNA or deoxyribose nucleic acid is the genetic material of most of the living organism. It contains nucleotides that are composed of three parts, namely sugar molecule, nitrogenous bases and a phosphate molecule. Sugar molecule used in DNA is deoxyribose sugar which lacks an oxygen molecule at the 2' position of the ribose sugar. Nitrogenous bases include adenine, guanine, cytosine, and thymine. Adenine pairs with thymine using two hydrogen bonds while guanine pairs with cytosine using three hydrogen bonds. Sugar and phosphate groups form the backbone of the DNA molecule and bases give the ladder-like structure to the DNA.
Hence, the correct answer is 'It contains the sugar ribose'.

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Similar questions

Q. Assertion ( A): Thymine pairs with adenine
whereas cytosine pairs with Guanine in DNA
molecule .
Reason ( R ):The hydrogen bonding between
bases of two strands is Highly specific .

STATEMENT-1 : Guanine unites with cytosine with three hydrogen bonds but it forms only one hydrogen bond with thymine.
STATEMENT-2 : Guanine and cytosine are purines while that of thymine is a pyrimidine.

Statement 1: The four nitrogen bases in a DNA molecule are guanine, thymine adenine, cytosine.

Statement 2: Where adenine and thymine are purines and guanine and cytosine are pyrimidines.

Q. Two stretches of DNA, A and B are taken for a polymerase chain reaction. If DNA-A has more guanine-cytosine bases than adenine-thymine and DNA-B has more adenine-thymine bases than guanine-cytosine bases, which of the following statements is true regarding PCR of these two stretches of DNA?

A biologist studying the genetic code is interested to know the number of possible arrangements of 12 molecules in a chain. The chain contains 4 different molecules represented by the initial A (for Adenine), C (for Cytosine), C (for Guanine) and T (for Thymine) and 3 molecules of each kind. How many different such arrangements are possible?

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