Bulk Movement (94Q)

Question 1

What are the 2 ways that bulk movement can occur?

Answer 1

• Endocytosis

- Exocytosis

Question 2

What is Endocytosis?

Answer 2

• Bulk movement INTO the cell

- There’s 3 different kinds of endocytosis

Question 3

What is the mechanism for Endocytosis?

Answer 3

-Inward folding (invagination) of membrane gets larger & then pinches off completely= results in membrane-bound vesicle in cytoplasm

Question 4

What are the 3 different types of Endocytosis?

Answer 4

• Phagocytosis
• Pinocytosis
• Receptor-Mediated Cytosis

Question 5

What is Phagocytosis?

Answer 5

• Cell eating

- When the Cell ingests solid particles

Question 6

What is Pinocytosis?

Answer 6

• Cell drinking

- When the Cell brings in small liquid droplets

Question 7

What is Receptor-Mediated Endocytosis?

Answer 7

-When specific molecule enters the cell bc they are recognized by receptor proteins

Question 8

What is an example of Receptor-Mediated Endocytosis?

Answer 8

• When LDL (low-density lipoprotein), which carries cholesterol & other lipids in the blood is recognized by LDL receptor which removes it from the blood=keeps blood lipids low
• If LDL isn’t taken out they can accumulate in arteries blocking blood flow= heart attacks