Cell Membrane Quiz

Choose the single correct answer: Which of the following is NOT a characteristic of a cell membrane?

• Provides mechanical strength

• Provides mechanical shape

• Responsible for the synthesis of ATP

• Regulates passage of molecules into and out of the cell

Which of the following statements is NOT correct regarding the cell membrane structure?

• Protein molecules may be partially or wholly embedded

• Protein molecules are localized toward one side of the cell

• Phospholipids form a bilayer

• The head of the phospholipid molecule is attracted toward water

Which of the following statement NOT correct about phospholipid molecules in the cell membrane?

• Each phospholipid molecule has four nonpolar tails

• Each phospholipid molecule has one polar head

• The phospholipid heads are attracted to water

• The phospholipid tails are not attracted to water

Which of the following statements is NOT correct about the phospholipid molecules in the cell membrane?

• The polar heads face outward

• The nonpolar tails face inward

• The polar heads are hydrophobic

• The nonpolar tails are hydrophobic

Which of the following statements is NOT correct about the cell membrane?

• Lipid molecules have difficulty in crossing the plasma membrane

• Charged molecules and ions readily move from inside the cell to outside the cell

• Carbon dioxide follows its concentration gradient as it exits a cell

• Oxygen readily follows its concentration gradient as it enters a cell

A ______ protein allows a particular molecule or ion to freely cross the cell membrane as it enters or exits the cell.

• Cell-recognition

• Receptor

• Enzymatic

• Channel

A ______ protein combines with a substance and helps to move it across the cell membrane.

• Carrier

• Channel

• Receptor

• Enzymatic

............ is the net movement of any type of molecule from a region of higher concentration to a region of lower concentration.

• Osmosis

• Diffusion

• Facilitated diffusion

• Active transport

Oxygen enters a cell by?

• Diffusion

• Filtration

• Osmosis

• Active transport

Which of the followings will increase diffusion of a molecule (Y) between side A and side B across membrane (Z)?

• Decrease surface area of Z

• Increase thickness of Z

• Decrease radius of (Y)

• Decrease concentration gradient of (Y)