TLS Online TPP Program

#Id: 7074

#Unit 3. Fundamental Processes

 Valyl-tRNA synthetase can sterically exclude isoleucine from its catalytic pocket because isoleucine is larger than valine. In contrast, valine should slip easily into the catalytic pocket of the isoleucyl-tRNA synthetase. Although both amino acids will fit into the isoleucyl-tRNA synthetase amino acid–binding site, interactions with the extra bonding with tyrosine’s OH group. Since no other amino acid resembles tyrosine, the enzyme can do without an editing function

TLS Online TPP Program

#Id: 3247

#Unit 3. Fundamental Processes

Mutations are also caused by compounds that substitute for normal bases (base analogs) or slip between the bases (intercalating agents) to cause errors in replication. 

TLS Online TPP Program

#Id: 9017

#Unit 6. System Physiology – Plant

When dark‐treated chloroplasts are exposed to light

These light actuated ion fluxes decrease the stromal concentration of protons (the pH increases from 7 to 8) and increase that of Mg2+ by 2 to 5 mM. 

TLS Online TPP Program

#Id: 2817

#Unit 13. Methods in Biology

In the salt fractionation most polar will be fractionated with large amount of salt.

TLS Online TPP Program

#Id: 629

#Unit 3. Fundamental Processes

Replacement of Purine to Purine is called Transition