Question

Anticodons are found in
A. mRNA
B. tRNA
C. rRNA
D. All of the above

Answer 1

The trinucleotide sequence of DNA or RNA, which corresponds to specific amino acid is called a codon, and where an anticodon is also a unit of three nucleotides that are corresponding to the bases of an mRNA codon.

Complete answer:
Anticodons are generally present on the tRNA, as triple or 3 nucleotide sequences where they form the complementary base pairs to the codons for own or more amino acids.
Some anticodons are generally paired with more than one codon, and this is mainly due to wobble base pairing.
Wobble base pairing is nothing but pairing between the 2 nucleotides in RNA molecules where they do not follow any rules that are formed by the Watson and crick.
Mainly there are 4 wobble pairs that are Guanine that pairs with uracil, and hypoxanthine that pairs with uracil, and hypoxanthine with adenine, also the hypoxanthine with cytosine, and this type of pairing, such as wobble base pairing occurs mainly to maintain the consistency of Nucleic acids.
The first nucleotide of anticodon which is not found on mRNA is inosine and it is the one that can form the hydrogen bond to more than one base in the corresponding codon position.
In the genetic code, it is common that for single amino acids, it is specified by all 3/4th positions or at least by both pyrimidines and purines.
For example for the amino acid glycine which is coded by codon sequences such as GGU, GGC, GGA, and GGG, whereas the other modified.
And the nucleotide that appears at 1st anticodon position, sometimes known as wobble position.

The correct option is B.

Note: In a cell, there are 61 types of tRNA required to provide one to one correspondence between tRNA molecules and codons that specify amino acids as there are 61 sense codons based on standard genetic code.