Cytoskeleton

Question 1

Function of cytoskeleton

Answer 1

• Maintains the shape of the cell
• Provides mechanical support
• Involved in cell motility:
- attach itself to proteins in the plasma membrane, and together allows the cell to move along the fibres found outside the cell
- vesicles bordering ER travel along Golgi apparatus
- cytoskeleton controls cell membrane to form food vacuoles for phagocytosis

Question 2

Centrosomes and centrioles

Answer 2

• centrosome forms microtubules
• centrioles found inside the centrosome
• centrioles found at 90° with each other
• made up of 9 triplet microtubules

Question 3

Desmones, Gap Junction, Tight junction

Answer 3

Functions:

• Keep both cells close together (connected)
• Allows direct transport of small molecules between cells
• Closes off the environment of either cells to each other

Structure:

• membranes held together by complex proteins that come from disk in cytoplasm of both cells
• protein channels (connexion proteins) organised with regulated channel between cells
• Integral proteins which hold plasma membranes of both cells together

Question 4

Water is the basis for life

Answer 4

• Is used to form the membrane - hydrophilic and hydrophobic tendencies lead to the formation of bilayer
• Is the basis of the cytoplasm formation, which forms the overall shape of cells
• Involved on many chemical reactions in the cell (acts as solvent so that more polar solutes are able to diffuse into the cell)

Question 5

Microfilaments, microtubules, intermediate filaments

Answer 5

• Protein which composes it:
Actin; Tubulin; Various protein
• Thinnest, Thickest, Intermediate size
•