cell membrane

Question 1

what is the cell membrane?

Answer 1

• Outer boundary of cell the cell that separates it from other cells and from
  external environment
• Made up of a double layer lipid molecules and associated proteins

Question 2

what is the fluid mosaic model?

Answer 2

mosaic = Proteins and substances such as cholesterol become embedded in the bilayer
fluid = the consistency of vegetable oil at body temperature, the proteins and other substances are able to move across it

Question 3

what are the functions of the cell membrane?

Answer 3

• physical barrier

- regulation of the passage of materials

Question 4

define selectively permeable

Answer 4

allowing certain materials into the cell (small materials) and not allowing certain substances in (large materials)

Question 5

what is the cell membrane made up of?

Answer 5

• bi phospholipid structure- Contains two layers (bi)
• Each phospholipid molecule contains a lipid molecule with a phosphate group
• hydrophilic head that is on the outside and a hydrophobic tail that is on the inside.
• Proteins and cholesterol molecules are embedded in the phospholipid

Question 6

what is the difference between the hydrophilic head and the hydrophobic tail?

Answer 6

hydrophilic head

• water-loving
• on the outside

hydrophobic tail

• water-hating
• inside

Question 7

what are channel proteins?

Answer 7

• form channel through the cell membrane to allow ions, water, and other small molecules to pass through

Question 8

what are carrier proteins?

Answer 8

• proteins that carry materials out through the cell membrane

Question 9

what does cholesterol do in the cell membrane?

Answer 9

Allows the cell membrane to stay fluid while at the same time keeping the cell from becoming fluid

Question 10

what do proteins do in the cell membrane?

Answer 10

• Assist in the transport of materials through the membrane
• Channel protein
• Carrier protein
• Assist in cell identity and cell to cell communications

Question 11

what do glycoproteins do in the cell membrane?

Answer 11

• Carbohydrates attached to a protein

- Act as receptors on the cell membrane surface

Question 12

what do glycolipids do in the cell membrane?

Answer 12

• Provide an energy source to the cell acting as a marker for cell recognition