Mechanisms of Passive Transport. Exam1

Question 0

what are water insoluble molecules considered?

Answer 0

lipophilic, hydrophobic, or non-polar

Question 1

what are water soluble molecules considered?

Answer 1

hydrophilic or polar

Question 2

What is passive transport?

Answer 2

Molecules moving through the membrane with no added energy.

Question 3

What is the first way passive transport can occur and give an example?

Answer 3

Substances moves by lipid solubility through the phospholipid bilayer

Ex: gases CO2, O2 fat-soluble vitamins A,D,E,K steroid hormones estrogen, testosterone, cortisol

Question 4

What is the second way passive transport can occur and give an example?

Answer 4

Substances move through water-filled pores

Ex: H+ion, K+ion, Cl-ion, urea, water

Question 5

what is the third way passive transport can occur and give an example?

Answer 5

Substances move by carrier proteins in membrane. Need to have lipophilic exterior and hydrophilic core with one or more pockets.

Ex: glucose, other simple sugars, amino acids, and nucleic acids