Question

If the sequence of bases in DNA is ATTCGATG, then the sequence of bases in its transcript will be
A. GUAGCUUA
B. AUUCGAUG
C. CAUCGAAU
D. UAAGCUAC

Answer 1

Hint: As the DNA is transcribed into a segment of RNA it contains complementary nitrogen bases in accordance with the given sequence, however for an RNA the nitrogenous base thymine is essentially replaced by Uracil.

Complete answer: The RNA produced by the method of transcription is what we know as a transcript. In DNA, Adenine-Thymine and Guanine-Cytosine pair together aided by the formation of hydrogen bonds between the 2 bases.
In RNA the nitrogenous base Thymine isn't present, instead, it gets replaced by Uracil, which possesses a very similar structure to Thymine.
So, according to the given sequence of base pairs in the DNA segment, the transcript formed by this segment would have the sequence as UAAGCUAC.

So, the correct answer is option D. UAAGCUAC.

Note: It is important to note that the complementary base pairing is vital in DNA because it allows the nitrogenous bases to be arranged in an efficient way, in terms of energy expenditure for base pairing; it is essential in forming the helical structure of DNA.
It is also important in replication because it allows the semiconservative replication to take place in DNA strands.