THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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glutamine, proline, tyrosine, phenylalanine
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adenine, guanine, cytosine, thymine
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leucine, proline, tyrosine, phenylalanine
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adenine, guanine, cytosine, uracil
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Detailed explanation-1: -Adenine, guanine, cytosine and thymine are the nitrogenous bases of DNA whereas, in an RNA molecule, thymine is replaced by uracil.
Detailed explanation-2: -There are four nucleotides, or bases, in DNA: adenine (A), cytosine (C), guanine (G), and thymine (T).
Detailed explanation-3: -Adenine is a nitrogenous base represented by the symbol A in DNA and RNA. It is a purine base and contains two nitrogenous rings fused together. The chemical formula for adenine is C5H5N5. Adenine attaches to the sugar molecule in nucleotides through the 1’ carbon on either ribose or deoxyribose.
Detailed explanation-4: -Nucleotide A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T). In RNA, the base uracil (U) takes the place of thymine.
Detailed explanation-5: -The Phosphate Group These phosphate groups are important, as they form phosphodiester bonds with the pentose sugars to create the sides of the DNA “ladder”. This is critical, as the hydrogen bonds which join the nitrogenous bases are not very strong.