Bio 218 Chap 7 Cell Membrane Quiz

What is the role of the cell membrane in the cell?

• It provides energy to the cell.

• It controls the movement of substances in and out of the cell.

• It is responsible for cell division.

• It stores genetic information.

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Why do our cells need cell membranes?

• To provide structural support

• To regulate the movement of substances in and out of the cell

• To store genetic information

• To produce energy for the cell

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How are the structures of the lipid bilayer and the plasma membrane different from each other?

• The lipid bilayer is a component of the plasma membrane.

• The plasma membrane is a component of the lipid bilayer.

• They are structurally identical.

• The lipid bilayer is only found in plant cells.

How does the interstitial fluid support the life cycle of the cell?

• By providing nutrients and removing waste

• By acting as a barrier to pathogens

• By facilitating cell division

• By maintaining cell structure

What do you think would happen to a cell if its plasma membrane became rigid and was no longer fluid?

• The cell would become more permeable.

• The cell would lose its ability to transport materials effectively.

• The cell would divide more rapidly.

• The cell would maintain its normal functions.

Using the interactive, complete the chart below on the common substances that travel across the Cell Membrane.

• Oxygen and carbon dioxide

• Glucose and amino acids

• Ions and water

• Proteins and nucleic acids

Why do you think molecules like water and oxygen can travel directly across the cell membrane, but molecules like glucose require help from proteins?

• Water and oxygen are smaller and nonpolar, allowing them to pass through the lipid bilayer easily.

• Glucose is a large and polar molecule, requiring transport proteins to cross the membrane.

• The cell membrane is selectively permeable, allowing only certain molecules to pass through.

• All of the above.

Based on the interactive, which of the following molecules travel across the membrane via passive transport?

• Oxygen

• Glucose

• Sodium ions

• Proteins

Which molecules have to be moved across the cell membrane using ATP?

• Glucose

• Oxygen

• Sodium ions

• Carbon dioxide

Click on the Oxygen and Carbon Dioxide molecules and observe how the molecules move in a specific direction. This process is called ____________ and it involves molecules moving from an area of _______ concentration to an area of _______ concentration. This is why oxygen moves __________ the cell and carbon dioxide moves __________ the cell.

• diffusion and it involves molecules moving from an area of high concentration to an area of low concentration. This is why oxygen moves into the cell and carbon dioxide moves out of the cell.

• osmosis and it involves molecules moving from an area of low concentration to an area of high concentration. This is why oxygen moves out of the cell and carbon dioxide moves into the cell.

• active transport and it involves molecules moving from an area of high concentration to an area of low concentration. This is why oxygen moves out of the cell and carbon dioxide moves into the cell.

• filtration and it involves molecules moving from an area of low concentration to an area of high concentration. This is why oxygen moves into the cell and carbon dioxide moves out of the cell.

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