Question

Which site of the RNA pairs through hydrogen bonding with the triplet codes on the mRNA?
A. Codon
B. 5’ end of tRNA
C. 3’ end of tRNA
D. Anticodon
E. Amino acid acceptor end

Answer 1

DNA is the hereditary material found in the mitochondria and nucleus of eukaryotic cells. In sexually reproducing organisms, DNA contains information from the parents.

**Complete answer :**
The DNA is present in the nucleus and it is the hereditary material carrying important genetic information as well as protein coding information. The DNA is organized into pairs of chromosomes, in turn the chromosomes are made up of thousands of genes. Genes are the carrier of specific characters in the organisms.
Each gene has a particular location in a specific chromosome and it contains the code for producing specific types of mRNA out of the three forms of RNA. The three types of RNA are ribosomal RNA, messenger RNA, transfer RNA. Since the DNA is present in the nucleus, it remains protected from the enzymatic action of the cell. Various different types of proteins are needed for different biological processes and are produced by a process known as transcription.
Transcription is defined as the process in which the genetic information from the DNA is transferred to the cytoplasm where proteins are manufactured by the ribosomes. In other words, the process of transcription is a process where a particular segment of DNA is copied onto the RNA. The process is carried out by using enzyme RNA polymerase.
During the process of transcription, the sequence of nucleotides in a DNA that codes for a protein is transferred to a messenger RNA (mRNA) through complementary base pairing of the nucleotide sequence in the gene. After this process, mRNA moves out of the nucleus into the cytoplasm by passing through the nuclear pore and it binds to specific sites on the surface of the ribosomes. The cytoplasm also contains transfer RNA or tRNA. Each of the tRNA contains a triplet of bases or codes which is known as the anticodon.
An anticodon is a three nucleotide sequence complementary to a corresponding codon in an mRNA through formation of hydrogen bonding and is usually found at one end of a tRNA molecule. Thus, the particular triplet codon on the mRNA is read by the anticodon present on the tRNA. At its 3’end each of the tRNA or transferRNA is charged with a particular amino acid.

Thus, option (D) Anticodon is the correct option.

Note: During the process of transcription, the information for protein coding is contained in DNA and is transferred into the cytoplasm through mRNA. The information of protein coding is complementary to the anticodon part of another RNA molecule, tRNA. Anticodon binds with the triplet codons of the mRNA by hydrogen bond.