Plasma Membrane - structure of plasma membrane&protein1

Question 1

plasma membrane

Answer 1

Insoluble semipermeable boundary of a cell that maintains the contents of the cell and regulates the movement of substances into and out of the cell.

Question 2

Phospholipid bilayer

Answer 2

Plasma membrane is composed of a double layer of phospholipid molecules

Question 3

Phospholipid

Answer 3

Has phosphate head which is polar and hydrophilic and two fatty acid tails which are non-polar and hydrophobic
- Hydrophilic head is attracted to water vs hydrophobic tails are repelled from the intercellular and extracellular water, forcing them to face towards each other and form a bilayer. 


Question 4

Fluid mosaic model

Answer 4

• Phospholipids and unanchored proteins are free moving giving the membrane fluidity, and flexibility.
• Anchored proteins, carbohydrates and cholesterol are scattered and embedded throughout giving the membrane a matrix mosaic pattern

Question 5

Receptor Proteins

Answer 5

Protein which binds specifically to a substance (ligand) to detect or receive a stimulus. Important for cellular communication.

Question 6

Recognition Protein

Answer 6

Acts as a marker on the membrane that can identify a cell as self or non self.

Question 7

Transport Proteins

Answer 7

Transports substances across membranes

Question 8

Carbohydrates

Answer 8

Usually linked to proteins, glycoproteins or lipids, glycolipids. They help with recognition and adhesion between cells, as well as recognition of antibodies hormones and viruses.

Question 9

Adhesion Proteins

Answer 9

Involved in binding with other cells or an extracellular matrix (called adhesion)