Helix-turn-Helix

Two helices are connected by a small loop or turn

These helices are stabilized by non-polar contacts between the helices

Mostly found in DNA binding proteins, directly involved in DNA binding

Generally consists of 20 amino acids

Second helix is involved in DNA binding, enters in major groove of the target site

TLS Online TPP Program

#Id: 2533

#Unit 13. Methods in Biology

The ‘Wallace rule’ (Lay Thein & Wallace 1986) is used to determine the appropriate stringency wash temperature: 

Tm = 4 × (number of GC base pairs) + 2 × (number of AT base pairs

TLS Online TPP Program

#Id: 7404

#Unit 5. Developmental Biology

Dorsal protein enters the nucleus and ventralizes the cell

TLS Online TPP Program

#Id: 4504

#Unit 13. Methods in Biology

When the positive terminal is on the left leg, the lead is known as the aVF lead.

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#Id: 6087

#Unit 10. Ecological Principles

The Himalayas (Largest Hot spot in india) 

This region holds a record of having 163 endangered species which includes the Wild Asian Water Buffalo, One-horned Rhino, and as many as 10,000 plant species, of which 3160 are endemic. This mountain range covers nearly 750,000 km2.

TLS Online TPP Program

#Id: 7734

#Unit 1. Molecules and their Interaction Relevant to Biology

The number of electrons in a neutral atom is equal to the number of protons.