THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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RNA is usually single-stranded.
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DNA is usually single-stranded.
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DNA contains uracil.
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RNA contains thymine.
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Detailed explanation-1: -Ribonucleic acid (abbreviated RNA) is a nucleic acid present in all living cells that has structural similarities to DNA. Unlike DNA, however, RNA is most often single-stranded. An RNA molecule has a backbone made of alternating phosphate groups and the sugar ribose, rather than the deoxyribose found in DNA.
Detailed explanation-2: -There are two reasons why RNA is generally single-stranded: RNAses are extremely abundant in most cells. Usually, double-stranded RNA is associated with a viral infection and is destroyed rapidly. Double-stranded RNA is not as stable as double-stranded DNA.
Detailed explanation-3: -Unlike double-stranded DNA, RNA is usually a single-stranded molecule (ssRNA) in many of its biological roles and consists of much shorter chains of nucleotides.
Detailed explanation-4: -So, the correct answer is ‘A ≠ U, G ≠ C’.
Detailed explanation-5: -Correct answer: RNA contains uracil, while DNA contains thymine. Explanation: RNA is different than DNA in that it 1) is single stranded (DNA is double stranded), 2) contains uracil (DNA contains thymine instead), and 3) contains a ribose sugar (DNA contains a deoxyribose sugar).