Depolarized state of a resting rod cell is due to the presence of a large number of open nonselective ion channels that admit both Na+ & Ca²+ into the cell

TLS Online TPP Program

#Id: 9997

#Unit 4. Cell Communication and Cell Signaling

Frizzled-G protein signaling activates PLC-beta, which cleaves PIP2 into DAG and IP3.

TLS Online TPP Program

#Id: 4466

#Unit 13. Methods in Biology

This method has been used to generate models of ribosomes, the muscle calcium pump, and 3-D structure of a poliovirus capsid.

TLS Online TPP Program

#Id: 7937

#Unit 2. Cellular Organization

Once the ER signal sequence emerges from the ribosome, it is bound by a signal recognition particle (SRP)

TLS Online TPP Program

#Id: 6012

#Unit 3. Fundamental Processes

Cdc6 has an ATPase activity that is required for it to support initiation.

TLS Online TPP Program

#Id: 7134

#Unit 6. System Physiology – Plant

Brassinosteroids are synthesized from the plant sterol campesterol, which is similar in structure to cholesterol. Members of the cytochrome P450 monooxygenase (CYP) enzyme family that are associated with the ER catalyze most of the reactions in the brassinosteroid biosynthesis pathway.

Mevalonic acid serves as a precursor of the triterpenoid pathway and is condensed and transformed to 2,3-oxidosqualene which further undergoes modification to form major plant sterols like sitosterols and campesterols.