A helicase usually initiates unwinding at a single-stranded region adjacent to a duplex. Note that it cannot unwind a segment of duplex DNA; it can only continue to unwind a sequence that has been started.

TLS Online TPP Program

#Id: 10105

#Unit 4. Cell Communication and Cell Signaling

Hemidesmosomes

Function- Shape, rigidity, signaling

TLS Online TPP Program

#Id: 10106

#Unit 4. Cell Communication and Cell Signaling

Focal adhesions 

Adhesion type- Cell-matrix

Adhesion receptors- Integrins

Cytoskeletal attachment- Actin filaments

TLS Online TPP Program

#Id: 10107

#Unit 4. Cell Communication and Cell Signaling

Focal adhesion

Function- Shape, signaling, force transmission, cell movement

TLS Online TPP Program

#Id: 10108

#Unit 4. Cell Communication and Cell Signaling

Tight junctions seal off body cavities and restrict diffusion of membrane components

TLS Online TPP Program

#Id: 10109

#Unit 4. Cell Communication and Cell Signaling

Tight junctions prevent the diffusion of: 

Macromolecules

Small water-soluble molecules

Ions

Membrane proteins 

Glycolipids

TLS Online TPP Program

#Id: 10110

#Unit 4. Cell Communication and Cell Signaling

Ca2+-dependent cadherin- mediated adhesion also plays an important role in tight-junction formation, stability, and function