Together, the two H2A.H2B dimers form the bottom part of the histone octamer located across the disc from the DNA ends

TLS Online TPP Program

#Id: 2534

#Unit 13. Methods in Biology

Probe length for PCR – the longer the oligonucleotide, the less chance there is of it binding to sequences other than the desired target sequence under conditions of high stringency.

TLS Online TPP Program

#Id: 181

#Unit 5. Developmental Biology

Genetic specificity of induction:

mesenchyme may instruct the epithelium as to what sets of genes to activate, the responding epithelium can comply with these instructions only so far as its genome permits.

TLS Online TPP Program

#Id: 6331

#Unit 8. Inheritance Biology

ZZ-ZW SEX DETERMINATION

The female is heterogametic, and the male is homogametic. The ZZ-ZW system is found in birds, some reptiles, butterflies, some amphibians, and some fishes. 

TLS Online TPP Program

#Id: 4450

#Unit 13. Methods in Biology

Electromagnetic lenses are used to focus a high-velocity electron beam instead of the visible light.

TLS Online TPP Program

#Id: 3775

#Unit 1. Molecules and their Interaction Relevant to Biology

The electrons revolve in orbits around the nucleus.