Biology Unit 3 Practice Questions from Openers

What is the purpose of the cell membrane?

• It produces energy for the cell.

• It controls the activities of the cell.

• It controls what enters and exits the cell.

• It absorbs food for the cell.

Tags

NGSS.MS-LS1-2

Which of the following is true in terms of lipids and their structure in the cell membrane?

• The glycerol is hydrophilic and is pointed out of the cell.

• The glycerol is hydrophobic and is pointed out of the cell.

• The fatty acid chain is hydrophobic and is pointed in toward the cell.

• The fatty acid chain is hydrophilic and is pointed in toward the cell.

Which of the following best describes a solute and a solvent?

• A solute is dissolved, and a solvent does the dissolving.

• A solute does the dissolving, and a solvent is dissolved.

• Both solute and solvent are always solids.

• A solute and a solvent are always liquids.

(a)   means that some things can flow through but others can’t.

• Selective transit

• Selective transport

• Selectively impermeable

• Selectively permeable

Which of the following is the purpose of the cell wall?

• It allows water to pass through indefinitely.

• It helps maintain the shape of the cell.

• It controls what enters and leaves the cell.

• It supports the organelles of the cell.

Tags

NGSS.MS-LS1-2

The current model for the cell membrane is called the Fluid Mosaic Model because:

• it describes a flexible layer with proteins embedded like a mosaic

• it is a rigid structure with fixed proteins

• it is made only of lipids and no proteins

• it is a solid, unmoving structure

Which of the following can pass through the cell membrane easily?

• hydrophilic molecules

• large proteins

• ions

• hydrophobic molecules

Which of the following is NOT a purpose of proteins in the cell membrane?

• They are enzymes for reactions.

• They help with cell recognition.

• They allow materials to pass through the membrane.

• They provide support and flexibility.

The difference between active and passive transport is:

• Active transport requires energy, while passive transport does not.

• Active transport moves substances from high to low concentration, while passive transport moves from low to high.

• Passive transport requires energy, while active transport does not.

• Both active and passive transport require energy.

Which of the following isn’t passive transport?

• osmosis

• facilitated diffusion

• endocytosis

• diffusion