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Question
Assertion (A): The backbone of DNA and RNA molecules is a chain consisting of heterocyclic base, pentose sugar and phosphate group.
Reason (R): Nucleotides and nucleosides mainly differ from each other in the presence of phosphate group.
Options
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.
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Solution
Assertion (A) is false, but Reason (R) is true.
Explanation:
The DNA molecule is made up of two strands that spiral around each other like a twisted ladder. Each strand has an alternate backbone of sugar (deoxyribose) and phosphate groups.
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RELATED QUESTIONS
Which of the following NOT present in DNA?
(a) adenine
(b) Guanine
(c) Thymine
(d) Uracil
Name the base that is found in nucleotide of RNA only.
Name the purine bases and pyrimidine bases present in RNA and DNA.
The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA?
Which base is present in RNA, but not in DNA?
Which of the following bases is not present in DNA?
Which of the following contributes to the double helical structure of DNA?
Which of the following statements is not true about RNA?
Mention two important functions of nucleic acids.
Give a reason for the following observations:
The two strands in DNA are complementary to each other.
