If the DNA triplet is TAG, the corresponding codon on the mRNA strand will be what?

Question

BlackTom AI · Accepted Answer

Transcription uses complementary base pairing with uracil (U) in RNA replacing thymine (T) in DNA: DNA T → RNA A, DNA A → RNA U, DNA G → RNA C, DNA C → RNA G.

1) Relevant knowledge points and concepts
- During transcription, RNA polymerase builds an mRNA strand complementary to the DNA template strand.
- Complementary pairs: DNA A pairs with RNA U; DNA T pairs with RNA A; DNA C pairs with RNA G; DNA G pairs with RNA C.
- mRNA contains uracil (U) instead of thymine (T).

2) Step-by-step reasoning process
- We interpret the given DNA triplet TAG as the sequence on the DNA template strand (the strand being read to make mRNA). Using base-pairing rules, transcribe each DNA base to its complementary RNA base in the same order.

3) Intermediate steps / calculations
- DNA base 1: T → complementary RNA base = A
- DNA base 2: A → complementary RNA base = U
- DNA base 3: G → complementary RNA base = C
- Combine the RNA bases in order: A + U + C = AUC

4) Why the correct answer is correct
- AUC is exactly the mRNA codon complementary to the DNA template TAG, following standard transcription rules and replacing T with A on the RNA, and A with U on the RNA. This directly follows the base-pairing mapping.

5) Why the other options are incorrect
- a. ACT: contains T (thymine) and no U, so it’s a DNA sequence, not an mRNA codon, and its bases don’t match the complementary mapping for TAG.
- c. AGC: G and C placement do not match the complement of TAG (TAG → AUC, not AGC).
- d. ATC: again contains T (a DNA base) and does not reflect RNA uracil nor the correct complement order.

6) Conclusion / final confirmation
- Therefore the mRNA codon complementary to the DNA triplet TAG is AUC. This matches the provided correct answer: b. AUC.

If the DNA triplet is TAG, the corresponding codon on the mRNA strand will be what?单项选择题

类似问题

What is the mRNA complement to the DNA template 5’-CGCATGTAGCGA-3’?

A section of a template strand of a gene is shown below. 3`–T-A-C-G-C-T-A-A-C–5` Which of the following represents the correct mRNA sequence transcribed from this segment?

If a segment of DNA is 5'-TAC GAT TAG-3', the RNA that results from the transcription of this segment will be

T/F: Whichever DNA strand is transcribed, the RNA polymerase reads the template strand from 3′ to 5′.

You own a bond that pays $64 in interest annually. The face value is $1,000 and the current market price is $1,021.61. The bond matures in 11 years. What is the yield to maturity?

Which of the following statements is CORRECT?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单