For the separation of membrane vesicles derived from tissue homogenates, ultra-pure
DNase-, RNase and protease-free sucrose represents a suitable and widely employed
medium for the preparation of stable gradients.

TLS Online TPP Program

#Id: 3203

#Unit 3. Fundamental Processes

Excision systems remove one strand of DNA at the site of damage and then replace it.

TLS Online TPP Program

#Id: 7856

#Unit 1. Molecules and their Interaction Relevant to Biology

When equal amounts of extrorotatory and levorotatory isomers are present, the resulting mixture becomes optically inactive because the optical activities of each isomer cancel each other.

Such a mixture is called a racemic or dl-mixture or (±)-conglomerate and this process of converting an optically active compound into the racemic modification is known of racemization. 

TLS Online TPP Program

#Id: 5442

#Unit 7. System Physiology – Animal

voltage-gated K + channels bring the action potential to an end and cause closure of their gates through a negative feedback process

TLS Online TPP Program

#Id: 9018

#Unit 6. System Physiology – Plant

When dark‐treated chloroplasts are exposed to light

activate enzymes of the Calvin–Benson cycle that require Mg2+ for catalysis and are more active at pH 8 than at pH 7 for STROMA

TLS Online TPP Program

#Id: 2024

#Unit 8. Inheritance Biology

Auxotrophs- Nutritional mutant that disrupts the ability to synthesize an essential biological molecule = mutant type