cell membrane

Question 1

function

Answer 1

1. seperates the intracellcular enviroment from the extracellular enviroment
2. controls the entry and exit of substances by being semi-permeable/selectively permeavle
3. enables cell recognition, by differentiating between self and non self cells
4. plays important roles in cell communication, cell adhesion and the binding of hormones

Question 2

structure

Answer 2

comprised of a phospholipid bilayer embedded with proteins

Question 3

phospholipids

Answer 3

hydrophilic head (water loving)
hydrophobic tail (water hating)

Question 4

types of proteins

Answer 4

integral proteins
peripheral proteins

Question 5

peripheral proteins

Answer 5

tend to move and are not permanent (enzymes)

Question 6

integral proteins

Answer 6

are permanently in the bilayer (recpetor proteins, channel proteins and glycoproteins)

Question 6

cholestrol

Answer 6

enables the cell membrane to be fluid and dynamic by preventing the cell membrane from becoming too solid (only in ANIMAL CELLS)

Question 7

glycolipids

Answer 7

structure: is a phospholipid with carbohydrate chain attached
role: cell recognition, cell communication, responsing to stimuli, helps with immunity against pathogens

Question 8

glycoproteins

Answer 8

structure: membrane protein with carbohydrate chains attached
role: is responsible for cell recognition to recognise self cells and non self cells also acts as a receptor for hormones

Question 9

fluid mosaic model

Answer 9

fluid: refers to the dynamic nature of the cell membrane and the ability of both lipids and proteins to move sideways in the membrane
mosaic: refers to the embedded proteins within cell membrane, refers to the pattern formed by the integral and peripheral proteins within the cell membrane