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Question 1 Molecules will NOT be able to cross the plasma membrane…

Question 1

Molecules will NOT be able to cross the plasma membrane by _______________________  if the cell’s mitochondria are inhibited?

Group of answer choices

a) Facilitated transport

 

b) Active transport

 

c) Osmosis

 

d) Ion channels

 

Question 2

Which of the following explains why facilitated transport does NOT require ATP?

Group of answer choices

a) The molecules moving down the membrane are charged

 

b) The molecules are traveling down their concentration gradients

 

c) The molecules are moving against their concentration gradients

 

d) The molecules require a transport protein in order to cross the membrane. 

 

Question 3

The rate at which molecule X moves across the plasma membrane decreases as the molecule moves down its gradient.  Based on this information, you can assume molecule X crosses the plasma membrane by which method (select all that apply)?

a) Simple Diffusion

 

b) Facilitated diffusion

 

c) Active Transport

 

d) Vesicular transport

 

Question 4: Which of the following correctly explains why O2 would diffuse through the phospholipid bilayer faster than a sodium or potassium ion?

a) Sodium and Potassium ions need ATP to diffuse down their gradient because they are charged ions. 

 

b) Sodium and Potassium ions need transport channels to diffuse down their gradient because they are charged ions. 

 

c) O2 can diffuse directly through the phospholipid bilayer because it is nonpolar.  

 

d) All of the above explain why O2 diffuses across the membrane quicker than sodium or potassium ions.  

 

e) Both b and c explain why  O2 diffuses across the membrane quicker than sodium or potassium ion.

 

Question 5

 

A decrease in red blood cells causes the kidneys produce erythropoietin, a hormone, which stimulates the bone marrow to produce more red blood cells.   Which of the following statements is true regarding this mechanism described?

 

a) This is an example of positive feedback because the oxygen levels are rising. 

 

b) Erythropietin is the effector in this mechanism

 

c) The bone marrow is the effector in this mechanism. 

 

d) The kidneys are the receptors in this mechanism. 

 

Question 6

 

Match the following items with the level of organization they fall under. 

ribosome tissue
small intestine chemical
cartilage cell
chondroblast organ

 

 

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