In normal vertebrate cells, ATP-powered phospholipid flippases  (members of the ABC transporter) called 

ATP11A and ATP11C

TLS Online TPP Program

#Id: 6010

#Unit 3. Fundamental Processes

In mammalian cells, Cdc6 is controlled differently; it is phosphorylated during S phase, and as a result it is degraded by the ubiquitination pathway.  Cdt1 is initially stabilized by the protein Geminin, which prevents its degradation, and subsequent Geminin binding prevents its reuse

TLS Online TPP Program

#Id: 8522

#Unit 2. Cellular Organization

Lysine acetylation 

ε-amino group of a specific lysine of α-tubulin

Microtubules are stabilized against breakage (centrioles, basal bodies, & primary cilia)

TLS Online TPP Program

#Id: 10452

#Unit 4. Cell Communication and Cell Signaling

Philadelphia chromosome generated by a translocation

between chromosomes 22 and 9

TLS Online TPP Program

#Id: 1197

#Unit 7. System Physiology – Animal

Granulosa cells have FSH receptors Theca cells have LH receptors

TLS Online TPP Program

#Id: 10527

#Unit 4. Cell Communication and Cell Signaling

By scramblase, appearance of phosphatidylserine on the outer surface, act as “eat me” signal