Plasma membrane function

Question 1

Basic functions

Answer 1

-defines internal vs external environment

-Role in exchange of matter and information between internal and external environment
-Important for communication with environment (transmembrane signal transduction receptors)

Question 2

Permeability barrier role

Answer 2

-Prevents entry of toxic compounds
-Prevents leakage of essential components
-Barrier for most solutes:
-Differences in rate of passive flux, eg: polar solutes, charged molecules and non-polar compounds

Question 3

solute transfer

Answer 3

-Transport systems for nutrient uptake
-Transport systems for waste excretion

Question 4

Involved in protein translocation

Answer 4

-Toxins
-Enzymes
-BActeriocins

Question 5

Roles of membrane

Answer 5

-Permeability barrier
-Mediate solute transfer
-Involved in protein translocation
-Plays a role in DNA synthesis and cell division
-NB role in chemotaxis and motility
-Plays a role in synthesis of macromolecules
-Location of several metabolic processes

Question 6

Synthesis of macromolecules

Answer 6

-Plasma membrane constituents
-Cell Wall constituents
-Lipopolysaccharides
-Appendage constituents
-Extracellular polymeric substances

Question 7

Location of several metabolic processes

Answer 7

-Respiration and photosynthesis
-Energy production and processing
-Enzymes associated with these processes are associated with plasma membrane