Cell Membrane

Question 1

also called the plasma membrane

Answer 1

cell membrane

Question 2

[functions of plasma membrane]

Channels, pumps

Answer 2

Transport of molecules

Question 3

[functions of plasma membrane]

Engulfing particles

Answer 3

Phagocytosis, pinocytosis

Question 4

[functions of plasma membrane]

Due to presence of carbohydrates

Answer 4

Cell to cell communication

Question 5

[functions of plasma membrane]

Cell membrane-bound receptors, enzymes and proteins

Answer 5

cell signaling

Question 6

protects the cellular organelles

Answer 6

Plasma memberane

Question 7

[functions of plasma membrane]

Segregates one part of the cell from other

Answer 7

Compartmentalization

Question 8

Membrane modification for specialized functions

Answer 8

Myelin sheath of neurons, microvilli in the intestine

Question 9

“Small, nonpolar molecules get in
ions and polar molecules don’t get in.”

Answer 9

Selective Permeability

Question 10

It separates interior of cell from the outside environment

Answer 10

Cell membrane

Question 11

Selectively permeable
Regulates entry
Responds to stimuli

Answer 11

Cell membrane

Question 12

year when it was discovered

Answer 12

1890

Question 13

year when the components were described

Answer 13

1915

Question 14

year when nicolson ans singer proposed what cell membrane looks like
(Fluid Mosaic Model)

Answer 14

1972

Question 15

What model?

Flexible not like the rigid cell walls
Can change shape
Similar with a mosaic art, it is also made up of different molecules namely phospholipids, proteins, carbohydrates and cholesterol that made up one functional structure, the cell membrane

Answer 15

Fluid mosaic model

Question 16

the major components

Answer 16

Phospholipid
proteins
cholesterol
carbohydrates

Question 17

acts as a barrier to protect the cell against various environmental insults and more importantly, enables multiple cellular processes to occur in subcellular compartments

Answer 17

Phospholipids

Question 18

Consists of glycerol, 2 fatty acid, phosphate-liked head group

Answer 18

Phospholipids

Question 19

lipid-bilayer sphere

Answer 19

liposome

Question 20

lipid-monolayer sphere

Answer 20

Micelle

Question 21

which part in phospholipid forms with H+ bond w/ water and other polar molecules

Answer 21

Hydrophilic

Question 22

helps cells to communicate, maintain their shape, carry out changes triggered by chemical messengers, and transport and share material

Answer 22

Protein

Question 23

Protein base in location

Answer 23

Integral & peripheral

Question 24

50% of the plasma membrane

Answer 24

proteins

Question 25

[PROTEIN] ALSO KNOWN AS INTRINSIC PROTEIN Extends across lipid bilayer Across cell membrane Moves w/ help of detergent

Answer 25

Integral

Question 26

Surface only easily removed composed of hydrophilic regions Anchored on the exterior or interior only, does not extend across

Answer 26

Peripheral

Question 27

Integral has

Answer 27

hydrophobic

Question 28

Peripheral has

Answer 28

hydrophilic

Question 29

penetrate the hydrophobic inside of lipid bilayer

Answer 29

Integral Proteins

Question 30

most are transmembrane proteins

Answer 30

Integral Proteins

Question 31

appendages loosely bound to either surface

Answer 31

Peripheral proteins

Question 32

Protein base in function

Answer 32

Ion Channel Carrier Proteins (transporters) Enzymes Receptor proteins Recognition Sites

Question 33

Pore that is so small that permits only few and specific ions (Na+, K+, Cl-, Ca2+) are a very narrow tube-shaped protein that help establish a tiny pore in the cell membrane

Answer 33

Ion Channel

Question 34

Permits entry and exit or large molecules (Glucose, Amino acid) Will undergo changes

Answer 34

Carrier Proteins (transporters)

Question 35

It speeds up the chemical reaction

Answer 35

Enzymes

Question 36

Attachment of specific hormones Use for communication Binding sites

Answer 36

Receptor proteins

Question 37

Protein with carbohydrates For Identification Important in immune system

Answer 37

Recognition sites (Glycoprotein)

Question 38

always on the outside surface and are different from receptor sites. These allows white blood cells to recognize your cells vs foreign cells.

Answer 38

Recognition sites (Glycoprotein)

Question 39

reduces membrane fluidity at moderate temps by reducing phospholipid movement at low temps it hinders solidification by disrupting the regular packing of phospholipids

Answer 39

Cholesterol

Question 40

It maintains the fluidity of cell membrane Enables the cell to be flexible in changes of temp Located in between phospholipids

Answer 40

Cholesterol

Question 41

They are always found on the exterior surface of cells and are bound either to proteins (forming glycoproteins) or to lipids (forming glycolipids)

Answer 41

Carbohydrates