BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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RNA nucleotides have the base uracil whereas DNA nucleotides have the base thymine
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RNA is a single stranded molecule whereas DNA is a double stranded over its entire length
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RNA nucleotides’ pentose sugar contains one less sugar that DNA nucleotide’s pentose sugar
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RNA is only ever found in the cytoplasm whereas DNA is only ever found in the nucleus
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RNA is synthesised in the nucleolus, whereas DNA is synthesised in the nucleus
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Detailed explanation-1: -Unlike DNA, RNA in biological cells is predominantly a single-stranded molecule. While DNA contains deoxyribose, RNA contains ribose, characterised by the presence of the 2′-hydroxyl group on the pentose ring (Figure 5). This hydroxyl group make RNA less stable than DNA because it is more susceptible to hydrolysis.
Detailed explanation-2: -There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine.
Detailed explanation-3: -DNA is a long polymer with deoxyriboses and a phosphate backbone. Having four different nitrogenous bases: adenine, guanine, cytosine and thymine. RNA is a polymer with a ribose and phosphate backbone. Four different nitrogenous bases: adenine, guanine, cytosine, and uracil.