1. The number 1,2 and 3 are the nucleotides of the anticodon for the mRNA codon 5' AUG 3'. Thus in order of 1, 2 and 3 the sequence of this anitocodon is......
a. UTG
b. ATG
c. GUA
d. CAU
I believe the answer is "d", Please check
To determine the sequence of the anticodon for the given mRNA codon (5' AUG 3'), we need to follow the pairing rules of nucleotides.
The pairing rules are:
- Adenine (A) pairs with Thymine (T) in DNA or Uracil (U) in RNA.
- Thymine (T) pairs with Adenine (A) in DNA.
- Guanine (G) pairs with Cytosine (C).
Given that the mRNA codon is 5' AUG 3', we can write its complementary sequence as 3' TAC 5'.
Now, let's determine the sequence of the anticodon using the pairing rules:
1. The first nucleotide of the codon (A) will pair with the third nucleotide of the anticodon. So the third nucleotide of the anticodon is T.
2. The second nucleotide of the codon (U) will pair with the second nucleotide of the anticodon. So the second nucleotide of the anticodon is A.
3. The third nucleotide of the codon (G) will pair with the first nucleotide of the anticodon. So the first nucleotide of the anticodon is C.
Putting it all together, the sequence of the anticodon is C-A-U.
Comparing the answer choices:
a. UTG - This doesn't match the anticodon sequence C-A-U.
b. ATG - This doesn't match the anticodon sequence C-A-U.
c. GUA - This doesn't match the anticodon sequence C-A-U.
d. CAU - This matches the anticodon sequence C-A-U.
Therefore, the correct answer is (d) CAU.