biological membranes 2.1.5

Question 1

what are examples of membranes ?

Answer 1

cell surface membrane, tonoplast, outer mitochondrial membrane, inner mitochondrial membrane , outer chloroplast membrane, nuclear envelope

Question 2

what are the roles of membranes?

Answer 2

1 partially permeable barriers between the cell and its environment or organelles in the cytoplasm
2 site of chemical reactions
3 site of cell communication

Question 3

explain in more detail how membranes are barriers

Answer 3

the cells surface membrane creates an enclosed space separating the internal environment from the external.
there are also intercellular membranes and they control the exchange of materials through them.

Question 4

why are membranes the site for chemical reactions?

Answer 4

membranes are folded to increase their surface area making chemical reactions more efficient

Question 5

why are membranes the site for communication?