Chapter 3: Plasma Membrane

Question 1

Which of the following about the plasma membrane is not true?
A. It is made of lipid molecules
B. It protects the cell’s cytoplasm.
C. It contains proteins.
D. It contains most of a cell’s DNA

Answer 1

D. It contains most of a cell’s DNA

Question 2

Cell adhesion molecules (CAMs) are of 2 parts namely:

Answer 2

Integrins
Cadherins

Question 3

Biology glue consists of

Answer 3

1. CAMs : Cell Adhesion Matrix
2. ECM: Extracellular Matrix
3. Junctions.

Question 4

Lack of collagen is called

Answer 4

Scurvy

Question 5

A Symptom of scurvy is

Answer 5

Bleeding of the gum

Question 6

What are the cable-like proteins that are fibrous too called?

Answer 6

Collagen

Question 7

Extracellular matrix (ECM) is made up of 3 insoluble proteins namely?

Answer 7

1. Collagen
2. Elastin
3. Fibronectin

Question 8

Which part of ECM can stretch and coil back and is also heavily involved in the makeup of the lungs?

Answer 8

Elastin

Question 9

Lack of Elastin causes_________

Answer 9

Non-functioning of the lung or COPD

Question 10

which part of ECM holds cells properly and in place?

Answer 10

Fibronectin

Question 11

Lack of Fibronectins

Answer 11

They are not produced in cancer cells, which is why cancer cells are found randomly in different parts of the body.

Question 12

what are the 3 kinds of Junctions?

Answer 12

1. Desmosomes
2. Tight junctions
3. Gap junctions

Question 13

which junctions act like “spot rivets” and are strong enough to stretch but not break apart?

Answer 13

Desmosomes

Question 14

A good example of Desmosomes is________________

Answer 14

Skin. and heart, uterine tissues

Question 15

which junctions firmly bind adjacent cells together to prevent undesirable leaks within the epithelial tissues?

Answer 15

Tight junctions/Occluding junction

Question 16

Great example of as tight junction is found___________

Answer 16

Blood-brain barrier (BBB), also kidney and the lumen of intestines.

Question 17

which junctions form small connecting tunnels known as connexons and allow the flow of ions and little molecules to pass.

Answer 17

Gap junctions.

They are also permeable.

Question 18

Where can Gap junctions be found?

Answer 18

Abundant in Cardiac and Smooth muscles. found in all Internal organs.

(Digestive tract, respiratory tract, cardiac muscle, pancreas, ovaries male repro, liver).

Question 19

3 types of vesicular transport?

Answer 19

1. Phagocytes
2. Pinocytes
3. Receptor mediated (NPR)