Question

A DNA segment has sequence ATC CAT CTA GTA, the sequence of RNA synthesized by this segment is

• A. TUG GTU GUT CAU
• B. GUT GTU GUT CAU
• C. CAU GTU GUT CTU
• D. UAG GUA GAU CAU

Answer 1

The correct option is D UAG GUA GAU CAU

• RNA is synthesized using the DNA template strand by RNA polymerase enzyme.
• The ribonucleotide sequence of RNA is complementary to that of DNA template strand except for the fact that the adenine base in DNA template strand will code for uracil base in the corresponding RNA strand.
• This is due to the fact that RNA has uracil in place of thymine.
• Thus, DNA sequence ATC CAT CTA GTA will code for RNA strand with sequence UAG GUA GAU CAU.
• Sequences in options A, B and C have thymine which is not present in RNA; these options are wrong.
  Hence, correct answer is option D.