A system to unambiguously describe the configurations of molecules with more than one asymmetric center was devised in 1956 by Robert Cahn, Christopher Ingold, and Vladimir Prelog. In the Cahn–Ingold– Prelog or RS system

TLS Online TPP Program

#Id: 3635

#Unit 3. Fundamental Processes

A minimum of 32 tRNAs are required to translate all 61 codons (31 to encode the amino acids and 1 for initiation).

TLS Online TPP Program

#Id: 3636

#Unit 3. Fundamental Processes

Rate of protein synthesis slows down when all three bases of a codon engaged in strong Watson-Crick pairing with the three bases of the anticodon.

TLS Online TPP Program

#Id: 3637

#Unit 3. Fundamental Processes

Normally there are 20 AATS exclusively specific for specific amino acid.

TLS Online TPP Program

#Id: 3638

#Unit 3. Fundamental Processes

There are two class of AATS.
1.Class I – that transfer amino acid at 2’ OH and then 3’ OH &
2. Class II – that directly transfer the amino acid to 3’ OH

TLS Online TPP Program

#Id: 3639

#Unit 3. Fundamental Processes

Class I AATS are generally monomer and rarely dimer.

TLS Online TPP Program

#Id: 3640

#Unit 3. Fundamental Processes

Class II AATS are generally dimer and rarely tetramer.