Membrane Structures and Transport

Question 1

A membrane is made of…

Answer 1

Lipids, sterol lipids, proteins

Question 2

Phospholipids form the bilayer and are composed of…

Answer 2

hydrophilic head and hydrophobic body

Question 3

Functions of Sterol lipids

Answer 3

1- Keep membrane fluid

2- Stabilize membrane

Question 4

Different types of proteins

Answer 4

1- Integral membrane
2- Transmembrane
3- Peripheral membrane

Question 5

7 membrane functions

Answer 5

1- Define cell
2- Selective transport 
3- Enzyme activity 
4- Signal transduction (protein receptors) 
5- Cell-to-cell links
6- Cell recognition 
7- Attachment to cytoskeleton

Question 6

Passive transport…

Answer 6

does not need energy from the cell

Question 7

Diffusion: movement of particles

Answer 7

From high to low []

Question 8

Diffusion: molecules that can diffuse through the membrane

Answer 8

H20, EtOH, O2, CO2, N2, hydrophobic molecules, lipid-soluble molecules

Question 9

Osmosis: Transport of…

Answer 9

Water through aquaporin channels and through membrane

Question 10

Osmosis: water moves to ??? from ??? until ???

Answer 10

Hypotonic (less solute) - Hypertonic (more solute) - Isotonic

Question 11

Osmosis: examples

Answer 11

Turgor pressure
Salt sugar as a preservative
Water moving in to stomach (afetr addition of H+ and Cl-)
Contractile vacuoles

Question 12

Facilitated diffusion: examples

Answer 12

Glucose transporter

Gated ion channels membranes of neurons