Cell Membrane Quiz

Phospholipids...

Arrange themselves in a double layer in the presence of water

Which is not found in the cell membrane? A. Lipid B. DNA C. Protein D. Cholesterol

DNA

The cell membrane in not involved in?

DNA replication

The movement of molecules from an area of greater concentration to an area of lesser concentration?

Diffusion

True or false: Animal cells have a cell wall that is formed outside the membrane.

False

True or false: The cell membrane is highly permeable to all ions.

False

A phospholipid molecule has a head and two tails. The tails are found...

In the interior of the cell membrane

The movement of water from an area of greater concentration to an area of lesser concentration?

Osmosis

List the following compounds in order of decreasing membrane permeability: glucose, Na+, H2O, Oxygen

Oxygen, H2O, glucose, Na+

The active transport process which is initiated by the binding of a ligand to a receptor?

Receptor mediated endocytosis

What ions are transported by the above protein?

Sodium and potassium ions

When a cell is placed in a hypotonic solution...

Water enters the cell toward the higher particle concentration and it swells up

When a cell is placed in a hypertonic sucrose solution...

Water exits the cell toward the area of higher particle concentration and it shrivels up

Molecules cross the plasma membrane __________.

actively and passively

Which of the following is a type of active transport? A. sodium potassium pump B. endocytosis C. exocytosis D. all of these

all of these

Which of the following is NOT a type of passive transport? A. diffusion B. osmosis C. endocytosis D. facilitated diffusion

endocytosis

Active transport requires:

energy

Cell membrane components are synthesized in the endoplasmic reticulum, transported as vesicles to the Golgi apparatus where they are modified, and then are transported to the cell surface where they deliver their contents to the cells exterior and become a part of the cell membrane in a process called ____________. The reverse of this process, bringing nutrient containing particles from out side to the inside of the cell is called _________.

exocytosis; endocytosis

A sample of cells is placed in a salt solution. The cells shrink and the membrane is distorted. Relative to the cell, the solution is probably:

hypertonic

The ____ portion of the cell membrane functions as a barrier while the ____ portion determines specific functions, including pumps, receptors, adhesion, etc.

lipid, protein

What is the charge on the inside of the cell during the resting membrane potential?

negative

What is the charge on the outside of the cell during the action potential?

negative

The active transport process which involves the cell taking in large particles and forming large vesicles?

phagocytosis

Which component of a cell membrane is likely to function as a receptor in cell to cell signaling?

proteins

A cell membrane is ______________.

semipermeable

What protein allows for the cell to return to the resting membrane potential?

sodium potassium pump

Chamber A contains 40% helium and Chamber B contains 20% helium. Chambers are connected by a tube the molecules are free to cross. Which of the following will occur? A. some helium will move from chamber A to chamber B B. some helium will move from chamber B to chamber A C. helium will remain concentrated in chamber A D. all of the helium will move into chamber B

some helium will move from chamber A to chamber B

An animal cell placed in a hypotonic solution will:

take on water

__________ and __________ are needed to transport molecules against their concentration gradient.

transporter proteins and an expenditure of energy