Lecture 10- Protein & Lioid Delivery Inside Cells

Question 1

Enzymes in the ER synthesize ___, _____, _____ for the whole cell

Answer 1

Phosphilipids
Glycolipids
Cholesterol

Question 2

What is the mechanism of the delivery of membrane lipids from ER to ER and nuclear envelope? (METHOD 1)

Answer 2

Lateral diffusion (they just have to slide over to the new location within the phospholipid bilayer)

Question 3

What is the mechanism for the delivery from the ER to the rest of endomembrane system? E.g., lysosomes, golgi apparatus, plasma membrane
(METHOD 2)

Answer 3

Transport vesicles

Vesicle (contains new lipids) leaves the ER, fuses with golgi apparatus, and delivers them

Question 4

What is the mechanism for the delivery from ER to semi-autonomous organelles? E.g., mitochondria, peroxisome (METHOD 3)

Answer 4

Phospholipid exchange proteins

There’s gonna be a net movement from the ER to the mitochondria

Question 5

How do plant cells get phospholipids? (Delivery to chloroplast)

A. Lateral diffusion
B. Transport vesicles
C. Phospholipid exchange proteins

Answer 5

C. Phospholipid exchange proteins (same as mitochondria)

Question 6

Mechanism for the delivery of proteins to the cytosol

Answer 6

free ribosomes

Question 7

Mechanism for the delivery of proteins to the mitochondria, peroxisome, and nucleus

Answer 7

Free ribosomes then import

Question 8

Mechanism of exported protein made from the ER

Answer 8

Ribosomes at ER and then vesicles

Question 9

Mechanism for delivery of proteins made at ER to the nuclear envelope and endoplasmic reticulum

Answer 9

Ribosomes at ER

Then Lateral diffusion

Question 10

Mechanism of protein delivery to the lysosome, plasma membrane, and golgi apparatus

Answer 10

Ribosomes at ER and then vesicles

Question 11

Mechanism for protein delivery to chloroplast

A. Free ribosomes
B. Free ribosomes + import
C. Ribosomes at ER + vesicles
D. Ribosomes at ER + lateral difusion

Answer 11

B. Free ribosomes + import