If the base sequence of a codon in mRNA is 5′-AUG-3′, the sequence of tRNA pairing with it must be:
a. 5′ – UAC – 3′
b. 5′ – CAU – 3′
c. 5′ – AUG – 3′
d. 5′ – GUA – 3′
tRNA has an anticodon loop. The bases in this anticodon loop form hydrogen bonds with the codons on mRNA. Anticodons are complementary to the codons on the mRNA.The answer is the option (b) 5'- CAU -3'.