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TLS Online TPP Program

#Id: 580

Catabolite repression is exerted through a second messenger called cyclic AMP (cAMP) and the positive regulator protein called the catabolite repressor protein (CRP), a dimer.

#Unit 2. Cellular Organization #Lac Operon #Part B Pointers
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TLS Online TPP Program

#Id: 8038

#Unit 1. Structure and Function of Biomolecules

His ionisation series
1------pK1-----pKr--------pKr------14
TLS Online TPP Program

#Id: 8039

#Unit 1. Structure and Function of Biomolecules

Glycine at pH 2.34, where there is an equal mixture of

  the average or net positive charge is 0.5 or +1/2
TLS Online TPP Program

#Id: 8040

#Unit 1. Structure and Function of Biomolecules

TLS Online TPP Program

#Id: 8041

#Unit 1. Structure and Function of Biomolecules

There are two type representation of amino acid structure

1. By Fischer’s convention L and D

2. By absolute configuration RS System
TLS Online TPP Program

#Id: 8042

#Unit 1. Structure and Function of Biomolecules

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: 8043

#Unit 1. Structure and Function of Biomolecules

RS Configuration 
Atoms of higher atomic number rank above those of lower atomic number (e.g., —OH ranks above —CH3). If the first substituent atoms are identical, the priority is established by the next atom outward from the chiral center (e.g., —CH2OH takes precedence over —CH3).