| A sample of DNA and mRNA is purified to analyse the base composition of each DNA strand and of the mRNA. The data is shown in the table below. Which strand of DNA serves as a template for mRNA synthesis? | ||||||||||||||||||||||||
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A) Strand 1
B) Strand 2
C) Both strand 1 and 2
D) Neither strand 1 and 2
Correct Answer: B
Solution :
During transcription, one DNA strand acts as a template, and is also referred to as template strand. The other DNA strand has the sequence same as RNA (except thymine at the place of uracil) and is called coding strand. From the data given in question, mRNA has same base composition as DNA strand 1 except it has uracil instead of thymine. So, this mRNA is transcribed from DNA strand 2.
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