Lecture 3 - Cytoskeleton

Question 1

Which protein DOES NOT inhibit microtubular polymerization?

Answer 1

Taxol

Question 2

Which intermediate filaments line the inner aspect of the nuclear envelope?

Answer 2

Nuclear lamins

Question 3

Which protein initiates growth of the F-actin from the sides of the existing filament and causes branching?

Answer 3

Arp 2/3

Question 4

Which of the following is NOT a type of intermediate filament?
A) keratins
B) fibronectin
C) neurofilaments
D) desmin

Answer 4

Fibronectin is located in the extracellular fluid.

Question 5

The structure of biologic membranes can be BEST described as:

Answer 5

A fluid mosaic of proteins interspersed in a phospholipid bilayer.

Question 6

Which membrane protein is represented by proteins that have a hydrophobic domain and two hydrophilic domains?

Answer 6

Transmembrane proteins.

Question 7

What molecule is located within the membrane of the phospholipid bilayer and moderates membrane fluidity by restricting movement of phospholipid fatty acid side chains at high temperatures?

Answer 7

Cholesterol

Question 8

Which membrane transport molecule carries 2 molecules simultaneously or sequentially in opposite directions?

Answer 8

Antiporter