Question

question 3
the sequence of nucleotides in an mrna molecule
○ matches the sequence of the ribosome that will translate the mrna.
○ is identical to that of the promoter.
○ exactly matches the template strand (except where u is substituted for t).
○ is complementary to the dna template strand.

Explanation:

• Analyze each option:
• Ribosomes don't have a nucleotide sequence matching mRNA; they are ribosomal RNA - protein complexes for translation, so first option is wrong.
• Promoter is a DNA region for transcription initiation, not related to mRNA sequence identity, so second option is wrong.
• mRNA is complementary to the DNA template strand (with U instead of T in mRNA, and A - U, T - A, G - C, C - G base - pairing), so it is complementary, not exactly matching (the third option says "exactly matches" which is incorrect as it should be complementary).
• During transcription, mRNA is synthesized using the DNA template strand as a guide, with complementary base - pairing (A in DNA pairs with U in mRNA, T in DNA pairs with A in mRNA, G and C pair with each other). So the mRNA sequence is complementary to the DNA template strand.

Answer:

D. is complementary to the DNA template strand.