Quiz on Plasma Membrane

The plasma membrane is composed of

• proteins and microtubules.

• lipids and actin filaments.

• lipids and proteins.

• lipids and microtubules.

Which of the following statements is true regarding the inside and outside of the plasma membrane?

• Both the inside and outside layers make up the phospholipid bilayer but cytoskeletal filaments are present on the inside layer and carbohydrate chains of glycolipids and proteins are present on the outside layer.

• The inside layer consists of a phospholipid bilayer while the outside layer consists of carbohydrate chains of glycolipids and proteins.

• The outside layer consists of a phospholipid bilayer while the inside layer consists of carbohydrate chains of glycolipids and proteins.

• Both the inside and outside layers make up the phospholipid bilayer and both layers contain identical proteins.

Which function does the lipid bilayer component of the plasma membrane NOT provide for the cell?

• defines a permeable boundary between the organized interior and the chaotic external environment

• controls the exchange of molecules between one cell and adjacent cells or the environment

• provides an impermeable, self-sealing membrane that keeps all internal living processes sealed inside

• provides a fluid and flexible boundary that insulates the interior from the variations in humidity, food, and other external conditions

Tags

NGSS.HS-LS2-3

According to the fluid-mosaic model of membrane structure,

• only lipids are found in the membrane.

• cholesterol is the main constituent of the membrane.

• glycolipids form a mosaic pattern inside the cell.

• proteins float inside or within the phospholipid bilayer

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

• It gives shape to the cell.

• It regulates passage of molecules into and out of the cell.

• It is largely responsible for cellular homeostasis.

• It serves as a site for protein synthesis.

What property of phospholipids makes them suitable for the formation of the double layer found in membranes?

• They serve as an attachment site for carbohydrates.

• They are uncharged.

• They have both a hydrophobic and a hydrophilic end.

• They are composed of fatty acids.

Which of the following molecules add stiffness and strength to the plasma membrane?

• phospholipids

• cholesterol

• phosphate groups

• glycoproteins

Which components of a cell membrane are used for cell-to-cell recognition?

• phospholipids

• channel proteins

• cholesterol molecules

• glycoproteins

Permeability refers to

• the movement of molecules from an area of greater concentration to an area of lesser concentration.

• the extent to which a membrane allows a substance to pass through.

• the amount of solute in a solution.

• the state of being permanent.

Proteins do NOT pass through cell membranes because

• the membrane is made of protein.

• they contain nitrogen.

• they are very large molecules.

• they cause emulsification.