Cell Membrane Structure and Transport

Which of the following is NOT a function of the cell membrane?

• It controls what enters or leaves the cell

• It recognizes signals from other cells

• It lets molecules like oxygen and food enter the cell and others like carbon dioxide and wastes leave the cell

• It is an impermeable membrane that allows nothing in or out

Tags

NGSS.MS-LS1-2

In the following diagram of the cell membrane, name the structure labeled 'A'.

• Channel protein

• Phospholipid bilayer

• Cholesterol

• Glycolipid

In the following diagram of the cell membrane, name the structure labeled 'B'.

• Transport protein

• Phospholipid bilayer

• Cholesterol

• Glycoprotein

Which of the following best describes how water is transported across the cell membrane

• Water is a non-polar molecule that can simply diffuse through the phospholipid bilayer.

• Water is a polar molecule that diffuses through the cell membrane with the help of channel proteins.

• The cell is impermeable to water.

• Water moves through the cell membrane with the help of cholesterol molecules.

Which of the following is true of this phospholipid molecule?

• The fatty acid tails are polar, hydrophilic molecules.

• The phosphate head contains no phosphorus.

• The fatty acid tails are non-polar, hydrophobic molecules.

• Water passes easily through the fatty acid tails.

Which of the following is the name of the model of the cell membrane that states that the phospholipids, proteins, and other molecules that make up the membrane are not stationary (i.e., they move relative to one another).

• Cell impermeability model

• Lock and key model

• Theory of relativity

• Fluid mosaic model

Which of the following describes the dissolved molecules labeled 'C' in the diagram.

• Molar molecules

• Solution molecules

• Solvent molecules

• Solute molecules

Which of the following describes the water in the diagram?

• Solvent

• Solute

• Solution

• None of the above

• All of the above

Which side pictured in the diagram--A or B--is hypertonic solution relative to the other side.

• A

• B

• Neither side

• Both sides

Tags

NGSS.HS-LS1-3

Which of the following is the likely effect on the level of the liquids in both sides of the tube over time?

• The level of side A will increase because side A is hypertonic and will cause the water to flow in that direction.

• The solute molecules on side B will flow to side A increasing the the level of side A.

• The level of side B will increase because side B is hypertonic and will cause the water to flow in that direction.

• Both sides are isotonic so they will both stay the same.