Lectures 10/11 Review

Why does the mitochondria and the chloroplast have 2 or more membranes?

When the phospholipids are dropped in water, they form a liposome. When a detergent is dropped in water, they will form a micelle. Why does this spontaneous reaction occur?

The composition of the lipid bilayer determines the fluidity of the membrane. What are some of these factors?

All of the following are functional classes of membrane proteins except:

• Transporter Protein

• Cholesterol

• Channel Protein

• Receptors

Can membranes be synthesized from scratch? Why or why not?

What is the difference between a transporter protein and a channel protein?

What are some characteristics of a molecule/ion that will determine if it is able to cross the membrane freely?

Is active transport only powered directly by ATP?

• Yes, ATP is the only source of power for active transport

• No, there are other forms of energy that could be used for active transport

• Yes, ATP is used directly due to its unique ability to pass through the sound barrier of the membrane

• No, ADP is the source that can help power active transport

Which of the following statements about transporters and channel proteins is true?

• Channel proteins allow solutes to cross through the membrane at a much faster rate than transporters

• Channels have specific binding pockets for the solutes to be allowed to pass

• Transporters are only used for passive transport

• Transporters are only used for active transport

Why is a molecule like O₂ able to cross the cell membrane without the assistance of a protein?