Freshman Biology Cell Membrane Structure and Function

A protein that is destined for the membrane would be made 

• on a ribosome that is in the cytoplasm
• within a lysosome
• on a ribosome attached to the rough endoplasmic reticulum 
• within the Golgi body

Which of the following cells would have the highest surface area to volume ratio?

• 1
• 2
• 3
• they are all the same

Which of the following molecules pass easily through the cell membrane, requiring little extra help or energy? Select all that apply.

• sodium

• glucose

• oxygen

• carbon dioxide

Which of the following is a true statement?

• Cells are small because it allows a faster rate of chemical exchange.

• Cells are small because it allows a slower rate of chemical exchange.

• Cells are large because it allows a faster rate of chemical exchange.

• Cells are large because it allows a slower rate of chemical exchange.

The ability to allow only certain molecules into or out of the cell.

• Semipermeability

• Permeability

• Impermeability

• Unpermeability

The compounds in biological membranes that form a barrier to the movement of hydrophilic materials across the membrane are 

• integral membrane proteins
• carbohydrates
• lipids
• peripheral membrane proteins

In biological membranes, the phospholipids are arranged in a _______, with the_______.

• bilayer; fatty acids pointing toward each other
• bilayer; fatty acids facing outward
• single layer; fatty acids facing the interior of the cell
• single layer; phosphorus-containing region facing the interior of the cell

Which statement about cholesterol molecules is true?

• They help hold a membrane together.
• They alter the fluidity of the membrane.
• They attach to carbohydrates.
• They disrupt membrane function.

A protein that forms an ion channel through a membrane is most likely 

• a peripheral membrane protein
• a phospholipid
• an enzyme.
• a transmembrane protein

Which of the following functions as a recognition site for interactions between cells?

• Phospholipids
• Cholesterol 
• Fatty acids
• Glycolipids