Bio Chapter 5 Proteins

Question 1

Passive transport

Answer 1

Allow ions or small molecules to cross a membrane to the side where they are less concentrated. High—> Low. Requires NO energy.

Question 2

Facilitated diffusion

Answer 2

Passive transport mechanism in which a solute moves across a membrane through a transport protein. Movement of molecules that cannot pass directly through the membrane lipids. These molecules MUST combine with carrier proteins to move across the membrane, follow the concentration gradient high—> Low. Requires NO energy.

Question 3

What is an example of facilitated diffusion?

Answer 3

Glucose needs a transport protein because it is too big to pass through a cell. High—> Low concentration.

Question 4

Active transport

Answer 4

A transport protein will pump a solute across the cell membrane AGAINST its concentration gradient. Low—> High. Requires Energy.

Question 5

Enzymes

Answer 5

Speed a specific reaction. Membranes provide a relatively stable reaction site for enzymes that work in series with other molecules.