STRUCTURES AND FUNCTIONS OF CELL MEMBRANE

In the diagram, structure D corresponds to:

• a transmembrane protein

• a lipid bilayer

• a peripheral protein

• cholesterol

In the diagram, structure B corresponds to:

• an integral protein

• a lipid bilayer

• a peripheral protein

• cholesterol

Which of the following is a function of the plasma membrane?

• breaks down lipids, carbohydrates, and proteins from foods

• stores water, salt, proteins, and carbohydrates

• keeps the cell wall in place

• regulates which materials enter and leave the cell

Which of the following substances requires a protein carrier in order to cross a membrane?

• water

• glucose

• an amino acid

• all of the above

Which of the following substances does not requires a protein carrier in order to cross a membrane?

• oxygen

• glucose

• sodium ion

• an amino acid

Because the cell membrane is mostly lipid, it only allows lipid-soluble substances. Which of the following substances are lipid soluble?

• water

• glucose

• an amino acid

• none of the above

Which of the following substances normally fails to cross cell membranes under any circumstances?

• Carbon Dioxide

• Deoxyribonucleic Acid

• a fatty acid

• oxygen gas

Scientists use the fluid mosaic model to describe the plasma membrane. What does the fluid mosaic model of the plasma membrane describe?

• The fluid mosaic model of the plasma membrane describes the plasma membrane as a fluid combination of phospholipids, cholesterol,

  and proteins.

• The fluid mosaic model of the plasma membrane describes that the plasma membrane has only membrane proteins and it is watery

• The fluid mosaic model of the plasma membrane describes that the plasma membrane has different types of phospholipids, which are only hydrophilic

• The fluid mosaic model of the plasma membrane describes that the plasma membrane is only made of water that has phospholipids that float in it

What are the two parts of the cell membrane that serve as site for cell recognition?

• peripheral and integral membrane proteins

• amino acids and lipids of the membrane

• glycolipids and glycoproteins of the membrane

• hydrophilic and hydrophobic ends of the membrane lipids

What molecules are found in animal cell membrane, but not in plant cell membrane?

• cholesterol

• starch

• glycogen

• all of the above