Breaking a bond always require energy to be added to the molecule. Correspondingly, making a bond always releases energy.

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: 8071

#Section 2: General Biology

Phosphorylation is the most common type of regulatory modification.

TLS Online TPP Program

#Id: 8608

#Section 3: Genetics, Cellular and Molecular Biology

There are three D cyclins in mammals:

cyclins D1, D2, and D3

TLS Online TPP Program

#Id: 8862

#Section 3: Genetics, Cellular and Molecular Biology

In vertebrates, stabilization of cohesins requires the cohesin-associated factor sororin.

TLS Online TPP Program

#Id: 8850

#Section 3: Genetics, Cellular and Molecular Biology

Geminin 

a small protein,, that contributes to the inhibition of re-initiation at origins until cells complete a full cell cycle.