Module 1: Lesson 5

Question 1

What is ubiquitin?

Answer 1

A small protein that marks protein for destruction by the proteasome

Question 2

Does ubiquitin attach covalently or non-covalently?

Answer 2

Covalently

Question 3

How is beta-catenin kept out of the nucleus?

Answer 3

Phosphorylation and ubiquitination

Question 4

What does cell fractation enable?

Answer 4

Isolation of different cellular compartments

Question 5

What are the lipid classes?

Answer 5

Fatty acids, phospholipids, steroids, glycolipids, triacylglycerides, and terpenes

Question 6

What is the role for phospholipid translocators and what are other names for them?

Answer 6

To flip phospholipids for symmetrical growth of the bilayer. Other names for them are scramblases and flippases.

Question 7

Where are sugars added to make a glycoprotein?

Answer 7

In the lumen of the ER and Golgi

Question 8

Where are sugars attached to bilayer glycoproteins?

Answer 8

Extracellular surface of the plasma membrane