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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GAC TAT
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CAG UAU
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GAC UAU
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GUA ATC
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Detailed explanation-1: -If the base sequence of one strand of DNA is CAT, TAG, CAT, CAT, GAC, the base sequence of its complementary mRNA would be GUA, AUC, GUA, GUA, CUG. During transcription of mRNA, adenine (A) is replaced by uracil (U), thymine (T) by adenine (A), guanine (G) by cytosine (C) and cytosine (C) by guanine (G). Q.
Detailed explanation-2: -To determine the sequence of the complimentary strand, we must look at each base in the template DNA strand and match it with its complimentary base. The strand that is complimentary to ATGCCGTATAGG is TACGGCATATCC.
Detailed explanation-3: -Determining mRNA Sequence RNA also uses four bases. However, instead of using ‘T’ as DNA does, it uses uracil (U). Therefore, if your DNA sequence is 3’ T C G T T C A G T 5’, the mRNA sequence would be 5’ A G C A A G U C A 3’.
Detailed explanation-4: -The complementary mRNA sequence to the DNA strand TGCCAT will contain the bases A, C, G, and U (instead of T). In addition, the mRNA sequence will contain the bases that complement the bases in the DNA strand. Therefore, the complementary mRNA base sequence will be: ACGGUA.