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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Thirty percent of a particular DNA strand is made of adenine. During transcription, a new mRNA molecule is made from this DNA strand. Which is most correct about the mRNA molecule produced?
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50% is cytosine
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40% is guanine
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30% is thymine
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30% is uracil
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Explanation:
Detailed explanation-1: -(b) The percentage of adenine is higher in the mRNA strand then in the DNA because during eukaryotic transcription a poly-adenine tail was added to the mRNA strand.
Detailed explanation-2: -The enzyme that converts DNA into mRNA is called RNA polymerase, which attaches to the DNA double helix as shown here. Once attached, RNA polymerase can unwind the helix and begin copying one of the DNA strands to form an mRNA transcript of the gene.
Detailed explanation-3: -Template strand is the DNA strand off which the mRNA is synthesized.
Detailed explanation-4: -Final answer: The sequence of mRNA produced by 3’ ATCGGTTAAC 5’ template strand, 5’ TAGCCAATTG 3’ stretch of DNA in coding strand will be 3’ GUUAACCGAU 5’.
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