Bacterial Cytoplasmic Membrane

Question 1

Cell envelope

Answer 1

-generic term used to describe the structures sureoundin the cytoplasm
-major structure include cytoplasmic membrane, cell wall, outer membrane, S layers,

Question 2

Roles of cell envelope

Answer 2

-maintain barrier to its environment
-protects cell from stress
-allows transport of nutrients into cell and waste out of cell
-energy conservation and production

Question 3

Cell membrane

Answer 3

-all cells have cell membrane
-in gram negative called the inner membrane
-primary barrier between the inner working of the cell and its environment

Question 4

Functions of cytoplasmic membrane

Answer 4

-permeability
-protein anchor
- energy conservation

Question 5

Cytoplasmic membrane picture

Answer 5

Question 6

Zoomed in phospholipid

Answer 6

-glycerol phosphate backbone is conserved in bacteria and eukaryotic
-different fatty acids can be incorporated into phospholipid that have different properties
-unsaturated FA increase fluidity of membrane

Question 7

Cytoplasmic membrane proteins

Answer 7

-peripheral membrane proteins are loosely attached to
-integral membrane proteins are embedded in the membranes
-transmembrane proteins are integral membrane proteins that pass all the way through the membrane

Question 8

Specific topologies of cytoplasmic membrane proteins

Answer 8

-proteins embedded in membrane have specific topologies
-inserted into the membrane so that specific parts face either cytoplasm or periplasm
-AA within the membrane are hydrophobic
-hydrophilic side chains often surface exposed in cytoplasm

Question 9

Two faces of the cytoplasmic membrane

Answer 9

-facing cytoplasm - cytoplasmic face
- other faces outward - periplasmic face
-two faces are not identical w - many proteins embedded such that certain domains face one compartment or the other