8 Proteins, Glycolipids, Sterols

Question 1

The plasma membrane contains a number of components which are integrated…

Answer 1

within it associate with the phospholipid bilayer

Question 2

Proteins function in the phospholipid bilayer

Answer 2

Enable transport of molecules through channels created by the protein

Catalyse reactiosn on the cell surface

Act as anchors for carbohydrates (glycoproteins) which allow identification by other cells via receptor

Question 3

Where are these proteins present

Answer 3

These proteins can be incoperated into the cell membrane spanning the entire membrane (transmembrane) or be associated with either surface of the phospholipid bilayer (peripheral)

Question 4

Glycolipids function in the phospholipid bilayer

Answer 4

Receptors - which viruses and other pathogens may take advantage of

Markers for cell recognitions

Facilitates cell to cell communication by acting as receptors or anchors for proteins and other regulators of signal transduction

Question 5

Where are glycolipids present

Answer 5

outer layer of the membrane

Question 6

Sterols function in the phospholipid bilayer

Answer 6

Not present in most prokaryotes

Regulate membrane permability, fluidity and protein function

Helps plasma membranes adapt to different temperatures

Question 7

Sterols - animal cells

Answer 7

Cholesterol

Question 8

Sterols - plant cells

Answer 8

Sitosterol

Question 9

Sterols - fungi

Answer 9

Ergosterol