diisopropylphosphofluoridate, reacts with a serine OH group in the active site of esterases such as acetylcholinesterase/chymotrypsin, whilst the organomercury compound p-hydroxymercuribenzoate reacts with a cysteine group, in both cases resulting in covalent bond formation and enzyme inhibition.

TLS Online TPP Program

#Id: 176

#Unit 5. Developmental Biology

Instructive interaction

It occur where the responding cell has a choice of fates and will follow one developmental pathway following induction and an alternative pathway in absence of the inductive signal. 

TLS Online TPP Program

#Id: 7277

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7687

#Unit 1. Molecules and their Interaction Relevant to Biology

                                                               Helix-turn-Helix

 

TLS Online TPP Program

#Id: 2009

#Unit 8. Inheritance Biology

Reciprocal crosses pair of crosses in which the phenotypes of the male and female parents are reversed.

TLS Online TPP Program

#Id: 5035

#Unit 3. Fundamental Processes

The replicon model proposed two components that controlled the initiation of replication: the replicator and the initiator. The replicator is defined as the cis-acting DNA sequences that are sufficient to direct the initiation of DNA replication.