Module 5

Question 1

How does a paramecium cope with living in freshwater?

Answer 1

Uses its contractile vacuole to remove excess water

Question 2

The sodium potassium ATPase pump moves sodium out of the cell and potassium into the cell against their concentration gradients. This process requires energy in the form of ATP. The best description for this type of transport is

Answer 2

Active transport through an antiport

Question 3

HIV is a viral disease. The cells are tricked into taking in viruses when the viruses activated a cell surface protein. How would you describe the manner in which the viruses get into his cells?

Answer 3

receptor mediated endocytosis

Question 4

Why is Fe+ not able to diffuse across the cell membrane?

Answer 4

A: it carries a charge
B: it is not hydrophobic

Question 5

What type of amino acids would you expect to find in the transmembrane portion of a membrane protein?

Answer 5

nonpolar amino acids

Question 6

If a blood cell (0.9% NaCl) is placed in a 4% NaCl solution what will occur?

Answer 6

crenation

Question 7

The disease cystic fibrosis is a defect in chloride ion transport into the lungs such that the mucous in the lungs becomes dehydrated and thick and bacteria may grow in the lungs. What is the likely defect?

Answer 7

Defective plasma membrane proteins

Question 8

Caffeine is a small nonpolar molecule. What is the most likely method by which it is absorbed into cells?

Answer 8

passive diffusion

Question 9

Glycosylation

Answer 9

A. Is the process of covalently bonding carbohydrates to lipids
B. Is the process of covalently bonding carbohydrates to proteins
C. Aids in cell recognition
D. Can create a protective layer

Question 10

Based on the following information, which has the highest concentration gradient? Sodium has 500 ions on the outside of the cell and 450 inside. Potassium has 500 ions outside of the cell and 550 inside. Calcium has 500 ions outside of the cell and 400 inside.

Answer 10

calcium

Question 11

When the concentration of molecules on either side of a plasma membrane is equal, the situation could be described as

Answer 11

isotonic or in equilbrium

Question 12

If blood cells are placed into a hypertonic solution they will

Answer 12

shrink

Question 13

Osmosis is a type of

Answer 13

passive diffusion

Question 14

When the grocery store sprays freshwater on your vegetables, they swell and look fresh and new. This is because the freshwater

Answer 14

Is hyposmotic to the cells of the vegetables