Quiz Questions

Question 1

The permeability of a membrane to a particular ion is dependent upon _____.

Answer 1

presence of open channels

Question 2

The likelihood of an ion going across a membrane is dependent upon what two things?

Answer 2

1. Permeability of membrane to that ion

2. Electrochemical gradient for that ion

Question 3

The resting membrane potential of a neuron at rest is _____.

Answer 3

negative

Question 4

What two things make up the glycocalyx?

Answer 4

1. Glycoproteins

2. Glycolipids

Question 5

What animal overproduces hyaluronic acid and what occurs?

Answer 5

Sharpeis

- Excess water is attracted to the dermis by HA creating the extra skin that is characteristic of this breed

Question 6

T/F: ECM is exclusive to c.t.

Answer 6

False

Question 7

What molecule phosphorylates other molecules?

Answer 7

Kinases

Question 8

As discussed in class, what immediately occurs after activation of a GPCR?

Answer 8

Binding of GTP to a trimeric G-protein

Question 9

What is the biological result of histamine binding to the H1 receptor?

Answer 9

Activation of PLC

Question 10

Through what signaling pathway does adrenaline work?

Answer 10

GPCR

Question 11

Through which signaling pathway does somatotropin (growth hormone) work?

Answer 11

enzyme-linked

Question 12

How does caffeine act to increase the concentration of cAMP in a cell?

Answer 12

Caffeine increases cAMP by inhibiting PDE

Question 13

What type of mutation in Ras causes it to be always on and stimulate cell division?

Answer 13

gain of function

Question 14

If a cell has just copied its DNA, which cell cycle checkpoint will it pass through next?

Answer 14

G2/M

Question 15

What type of mutation in Rb causes Rb to be always off and unable to control cell division?

Answer 15

loss of function