T Cells Undergo Positive and Negative Selection

TLS Online TPP Program

#Id: 8318

#Section 3: Genetics, Cellular and Molecular Biology

Nucleation phase 

Two G-actin molecules bind relatively weakly to each other, but addition of a third actin monomer to form a trimer makes the entire group more stable, acts as a nucleus for polymerization.

TLS Online TPP Program

#Id: 8877

#Section 3: Genetics, Cellular and Molecular Biology

The pool of active Cdc25C is created, that activates the large pool of cytosolic cyclin B-CDK1, which activates more cytosolic Cdc25C as part of positive feedback loop 1

TLS Online TPP Program

#Id: 8398

#Section 3: Genetics, Cellular and Molecular Biology

In the presence of ATP and Ca+2 , the myosin heads extending from the thick

filaments walk toward the (+) ends of the thin filaments.

TLS Online TPP Program

#Id: 8973

#Section 3: Genetics, Cellular and Molecular Biology

The current record holder is the gene Dscam in Drosophila. Alternative splicing of its 95 exons could potentially produce more than 38,000 kinds of proteins from this single gene.

TLS Online TPP Program

#Id: 8088

#Section 2: General Biology

The presence of one or more fatty acids with cis double bonds interferes with this tight packing and results in less stable aggregates.