Translation starts at the 5’end of the ORF and proceeds one codon at a time to the 3’end. The first and last codons of an ORF are known as the start and stop codons.

TLS Online TPP Program

#Id: 1401

#Unit 4. Cell Communication and Cell Signaling

Myosin I

single head domain

Function- Membrane association, endocytosis

TLS Online TPP Program

#Id: 1402

#Unit 4. Cell Communication and Cell Signaling

Myosin II

Two heads and assembles into bipolar filaments

Small and non-processive

Function- Contraction 

TLS Online TPP Program

#Id: 1403

#Unit 4. Cell Communication and Cell Signaling

Myosin V

Two heads but does not assemble into filaments

Large and processive

Function- Organelle transport

TLS Online TPP Program

#Id: 1404

#Unit 4. Cell Communication and Cell Signaling

All Myosins move toward the (+) end of an actin filament except myosin VI.

TLS Online TPP Program

#Id: 1405

#Unit 4. Cell Communication and Cell Signaling

Myosin VI move toward the (−) end of an actin filament. 

TLS Online TPP Program

#Id: 1406

#Unit 4. Cell Communication and Cell Signaling

The length of the myosin II neck domain determines the rate of movement.