5.1: Cellular membranes are fluid mosaics of lipids and proteins

Question 1

amphipathic

Answer 1

water loving and water fearing moleculue(phopholipids)

Question 2

Cell membrane and its compostition

Answer 2

bounds the cell and is made of phopholipids and proteins(the 2 major structural components)

Question 3

Phospholipids

Answer 3

lipids that very abundant in the plasma membrane, creates a bilayer in an aqeous solution

Question 4

Fluid mosaic model

Answer 4

a mosaic of proteins bobbing in a fluid bilayer of phopholipids(basically they are loose and fluid)

Question 5

Which molecules can get into the bilyaer without aid

Answer 5

“small” hydrophobic molecules can get in easily,hydrophillic molecules can barely get in by themselves

Question 6

Fluid

Answer 6

more unsaturated fatty acids

Question 7

Viscous

Answer 7

has more saturated fatty acids, packed together

Question 8

How do the phospholipids and some proteins move in the lipid bilayer, can they switch layers?

Answer 8

Phospholids and some proteins move latterally, this allows for permeability. They can rarely switch layers

Question 9

How does temperature affect phospholipids and proteins in the bilayer, what does more unsaturated fats do to the cell membrane?

Answer 9

More unsaturated tails means fluidity is maintained even in low temperature, More unsaturated tails means fluidity is maintained even in low temperature

Question 10

How temp affects cholesterol?

Answer 10

higher temp= less fluid

lower temp = more fluid

Question 11

main components of cell membranes

Answer 11

consists of phopholipids, proteins, and carbohydrates(no nucleic acids)

Question 12

Is water able to get into the membrane?

Answer 12

yes, through channel proteins caller aqua porins

Question 13

Integral proteins, and what are most of them ?

Answer 13

penetrates hydrophobic interior of membrane, most integral are transmembrane proteins, goes all the way through the bilayer due to nonpolarity of alpha helices

Question 14

Peripheral proteins

Answer 14

exist outside the membrane and goes along the bilayer only interacting with the hydrophilic side of lipid bilayer

Question 15

What are the six major functions of the lipid bilayer

Answer 15

transport, enzymatic activity, signal trans. , cell to cell rec., intercellular joining, and Attacment to the cytoskeleton and EM

Question 16

What are the functions of glycolipids and glycoproteins

Answer 16

Glycoprotein: sugar attached to a protein more common, acts as ID tags or else you are terminated

Question 17

If you are a product/protein wanting to be on the outside, what side do you have to be made in the ER

Answer 17

inside, the golgi apparatus will program you to go to a specific place