Membranes

Question 1

What is metabolism?

Answer 1

All of the chemical reactions that take place in a cell

Question 2

What can control metabolism?

Answer 2

Protein Pores, Protein Pumps and Membrane-Bound Enzymes

Question 3

What are protein pores?

Answer 3

Channel-forming proteins which only allow specific molecules to cross membranes

Question 4

What is an example of a membrane-bound enzyme?

Answer 4

ATP synthase- When hydrogen ions that have been pumped across the membrane passes through ATP synthase, ADP and Pi is used to make ATP

Question 5

What are protein pumps?

Answer 5

Certain proteins on the cell membrane that act as carrier molecules which transfer specific ions across the cell membrane. They require energy

Question 6

What is an example of a dual role protein pump?

Answer 6

The sodium/potassium pump which actively pumps sodium ions put of the cell and potassium ions into the cell, both against their own concentration gradient

Question 7

Why is the membrane referred to as fluid?

Answer 7

The phospholipid bilayer can move; proteins can move laterally

Question 8

Why is the membrane referred to as mosaic?

Answer 8

The proteins can be arranged in a patchwork-like pattern in or on the phospholipid bilayer, like a mosaic