20 - Cellular organization (DLA)

Question 1

What are the main components of the membrane?

Answer 1

Lipids and proteins

Question 2

Lipids are Am…

Answer 2

Amphipathic

• Hydrophilic
• Hydrophobic

Question 3

3 major classes of lipids?

Answer 3

Phospholipids
Cholesterol
Glycolipids

Question 4

2 major classes of proteins?

Answer 4

Integral - embedded in or pass through the lipid bilayer

Peripheral - associate with integral membrane proteins

Question 5

What is the most abundant membrane lipid?

Answer 5

Phospholipid

Question 6

What affects the membrane fluidity?

Answer 6

Cholesterol

Question 7

Glycolipids account for what % of the lipid molecules?

Answer 7

5%

Question 8

6 categories of integral membrane proteins?

Answer 8

Pumps, Receptors, Channels, Linkers, Enzymes, Structural proteins

Question 9

What is a carbohydrate rich zone and helps establish the microenvironment at the cell surface?

Answer 9

Glycocalyx

Question 10

What does the Glycocalyx do for cell to cell interaction?

Answer 10

Lectins - carb binding proteins

Question 11

What is the fluid mosaic model?

Answer 11

lipids and proteins have the ability to move on the plane

Question 12

What stabilizes the membrane?

Answer 12

Cholesterol by reducing membrane fluidity

Question 13

What is permeable through the membrane?

Answer 13

hydrophobic, non-polar, uncharged (02 and CO2)

Question 14

What is not permeable through the membrane?

Answer 14

Polar and charged,

Question 15

Exocytosis

Answer 15

Substance exits the cells by a vesicle

Question 16

Endocytosis

Answer 16

Substance enters the cell by a vesicle formed from plasma membrane

Question 17

3 types of endocytosis?

Answer 17

Receptor-mediated: cargo specific/clathrin dependent
Pinocytosis: non-specific/clathrin independent
Phagocytosis: clathrin specific/ actin specific

Question 18

Pinocytosis vs. Phagocytosis?

Answer 18

Pino - cell drinking

Phag - ingestion