What is the primary function of the cell surface membrane?

• To control the substances that enter and leave the cell

• To store genetic information

• To synthesize proteins

• To provide energy to the cell

What percentage of membrane lipids do glycolipids make up?

• 20%

• 15%

• 10%

• 5%

Which type of lipid makes up 75% of the cell surface membrane?

• Cholesterol

• Glycolipids

• Phospholipids

• Triglycerides

What is the role of cholesterol in the cell membrane?

• To increase fluidity

• To decrease fluidity

• To act as a channel

• To transport nutrients

What model describes the structure of the cell surface membrane?

• Phospholipid model

• Protein channel model

• Lipid bilayer model

• Fluid mosaic model

Which of the following is NOT a function of intrinsic proteins?

• Act as receptors

• Provide structural support

• Transport substances

• Act as channels

What is facilitated diffusion?

• Movement of water only

• Movement against the concentration gradient

• Movement of ions only

• Movement with the concentration gradient using transport proteins

Which process requires ATP to transport substances across the membrane?

• Diffusion

• Active transport

• Osmosis

• Facilitated diffusion

What is the primary role of the sodium/potassium pump?

• To synthesize ATP

• To maintain an electrochemical gradient

• To facilitate osmosis

• To transport glucose

What is the main difference between phagocytosis and pinocytosis?

• Phagocytosis involves liquid, pinocytosis involves solids

• Both involve liquid particles

• Phagocytosis involves solids, pinocytosis involves liquid

• Both involve solid particles