BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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120 adenine and 120 uracil molecules
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120 thymine and 120 adenine molecules
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120 cytosine and 120 thymine molecules
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240 adenine and 240 cytosine molecules
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Detailed explanation-1: -A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines.
Detailed explanation-2: -According to Chargaff’s rules, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine i.e A = T = 120 and G = C = 120, therefore, the total no. of nucleotides would be 120×4=480. Q.
Detailed explanation-3: -Answer and Explanation: A double-stranded DNA molecule with 20% thymine would contain 30% guanine. Erwin Chargaff determined that species have almost equal levels of adenine and thymine, and guanine and cytosine.
Detailed explanation-4: -A short length of double stranded DNA molecule contains 120 adenine and 120 cytosine Bases. The total number of nucleotides in this DNA fragment is. No worries!