Heterochromatin and RNAi are required to establish the human CenH3 homolog, CENP-A, at centromeres.

TLS Online TPP Program

#Id: 4492

#Unit 13. Methods in Biology

ST segment - plateau portion of the ventricular action potential.

TLS Online TPP Program

#Id: 10064

#Unit 4. Cell Communication and Cell Signaling

The adhesiveness of cadherins depends on the presence of extracellular Ca2+

TLS Online TPP Program

#Id: 108

#Unit 5. Developmental Biology

Determination

The process by which portions of the genome are selected for expression in different embryonic cells. 

TLS Online TPP Program

#Id: 1564

#Unit 4. Cell Communication and Cell Signaling

Upon secretion, Wnt proteins associate with glypicans (heparan sulfate proteoglycan) in the ECM, which restricts diffusion and leads to a greater accumulation of Wnt closer to the source of production.

TLS Online TPP Program

#Id: 3504

#Unit 2. Cellular Organization

In multicellular eukaryotes most genes are interrupted, and the introns are usually much longer than exons, so genes are considerably larger than their coding regions.