zoology week 4

Question 1

What are the various ways that substances are transported across the cell membrane or are taken up by the cell (or exit from the cell)?

Answer 1

diffusion, facilitated diffusion, active transport

Question 2

What type of molecule embedded in a cell membrane is required in order for a substance such as glucose to cross the cell membrane when moving from high to low concentration? Is energy in the form of ATP required for this process? What is another name for this process?

Answer 2

protein, no ATP, facilitated diffusion

Question 3

What type of molecule embedded in a cell membrane is required for active transport or active co-transport of a substance(s) across a cell membrane (from low to high concentration)? Is energy in the form of ATP also required? What is an example of substances that move via this process?

Answer 3

protein, energy in the form of ATP is necessary. calcium?

Question 4

What are 3 types of proteins in cell membranes that are involved in attachment or cell-cell sharing?

Answer 4

glucose, sodium, potassium

Question 5

What is the definition of diffusion?

Answer 5

Particles move from an area of high concentration to low concentration.

Question 6

What is the definition of osmosis?

Answer 6

Diffusion of h2o across a semipermeable membrane (the movement of water across membranes)

Question 7

What type of molecule moves during osmosis?

Answer 7

water

Question 8

What is the body’s most common semi-permeable membrane?

Answer 8

plasma membrane