Question

question 3 (4 points)
(03.03 lc)
a triplet of bases in a template strand of dna is gat. what would be the corresponding codon for mrna?
a cta
b cua
c ctu
d cuu
question 4 (4 points)
(03.03 mc)
if a trna molecule has an anticodon which reads augaca, what was the codon of the mrna molecule?
a cgucac
b tactgt
c tagtgt
d uacugu

Explanation:

Step1: Recall base - pairing rules for DNA to mRNA

In transcription, DNA bases pair with mRNA bases. Adenine (A) in DNA pairs with uracil (U) in mRNA, thymine (T) in DNA pairs with adenine (A) in mRNA, and cytosine (C) in DNA pairs with guanine (G) in mRNA, and guanine (G) in DNA pairs with cytosine (C) in mRNA.

Step2: Find the mRNA codon for DNA triplet GAT

For the DNA triplet GAT, G pairs with C, A pairs with U, and T pairs with A. So the mRNA codon is CUA.

Step3: Recall base - pairing rules for tRNA anticodon to mRNA codon

The base - pairing rules for tRNA anticodon and mRNA codon are: adenine (A) pairs with uracil (U), uracil (U) pairs with adenine (A), cytosine (C) pairs with guanine (G), and guanine (G) pairs with cytosine (C).

Step4: Find the mRNA codon for tRNA anticodon AUGACA

For the tRNA anticodon AUGACA, the corresponding mRNA codon: A pairs with U, U pairs with A, G pairs with C, A pairs with U, C pairs with G, A pairs with U. So the mRNA codon is UACUGU.

Answer:

Question 3: b. CUA
Question 4: d. UACUGU