Question

Analyze the following statements. Which of them is correct with respect to the RNA transcript formed by means of transcription?

a.The RNA transcript is an exact replica of the DNA from which it is transcribed. It has the same sequence as that of its parent DNA strand.
b. The RNA transcript is complimentary to the DNA from which it is transcribed. Instead of thymine, it has uracil, which complements the adenine of DNA.
c. The RNA transcript is an exact replica of the DNA from which it is transcribed. Instead of adenine, it has uracil, which complements the thymine of DNA.

Answer 1

Answer: The correct answer is -

b. The RNA transcript is complimentary to the DNA from which it is transcribed. Instead of thymine, it has uracil, which complements the adenine of DNA.

Step-by-step explanation:

Transcription is a process of formation of mRNA (messenger RNA) from DNA. During this process, RNA polymerase enzyme uses the template DNA strand and adds the nucleotides (in mRNA in the 5' to 3' direction) complimentary to this. It adds uracil in the mRNA transcript for adenine in rhe DNA template. Similarly, for guanine in the DNA, cytosine is added.

Thus, option b) is the right answer.

Answer 2

The correct answer is B. During transcritption, RNA polymerase synthesizes a complementary RNA transcript, from the DNA. RNA lacks thymine, and possess uracil instead of it. The RNA polymerase makes this antiarallel primary transcript, complementary to the DNA