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Question
What will the RNA code if the DNA code is ATG?
What will the RNA code if the DNA code is ATG?
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Solution
The correct option is C UAC
According to Watson and Crick model, five nitrogenous bases are present in DNA and RNA. The purine bases are adenine and guanine and pyrimidines are namely cytosine, thymine and uracil. A purine always pairs with a pyrimidine and a pyrimidine base pairs with purine base only; thus, adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C). Uracil (U) is a pyrimidine base that is present in RNA in place of T. Transcription of DNA template strand by RNA polymerase produce RNA transcript which have a sequence complementary to the template strand. A template with "ATG" will code a RNA transcript with triplet "UAC". The triplets given in option A and D have "T" which is not present in RNA which makes them wrong. Code in option B does not follow base pairing rule; T is paired with U, which makes it wrong. Correct option is C.
According to Watson and Crick model, five nitrogenous bases are present in DNA and RNA. The purine bases are adenine and guanine and pyrimidines are namely cytosine, thymine and uracil. A purine always pairs with a pyrimidine and a pyrimidine base pairs with purine base only; thus, adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C). Uracil (U) is a pyrimidine base that is present in RNA in place of T. Transcription of DNA template strand by RNA polymerase produce RNA transcript which have a sequence complementary to the template strand. A template with "ATG" will code a RNA transcript with triplet "UAC". The triplets given in option A and D have "T" which is not present in RNA which makes them wrong. Code in option B does not follow base pairing rule; T is paired with U, which makes it wrong. Correct option is C.
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