Cell Membrane

Question 1

Diffusion

Answer 1

The spreading of something more widely.

Question 2

Osmosis

Answer 2

A process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.

Question 3

Facilitated Diffusion

Answer 3

Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins.

Question 4

Selectively Peermiable

Answer 4

Definition of Selectively Permeable Membranes. All cells are enclosed with a cell membrane. A selectively permeable cell membrane is one that allows certain molecules or ions to pass through it by means of active or passive transport.

Question 5

Equilibrium

Answer 5

A state in which opposing forces or influences are balanced.

Question 6

Hypertonic Solution

Answer 6

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell.

Question 7

Hypotonic Solution

Answer 7

A hypotonic solution is any solution that has a lower osmotic pressure than another solution. In the biological fields, this generally refers to a solution that has less solute and more water than another solution.

Question 8

Isotonic Solution

Answer 8

An isotonic solution refers to two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side.

Question 9

Contractile Vacuole

Answer 9

A vacuole in some protozoans that expels excess liquid on contraction.

Question 10

Passive Transport

Answer 10

Passive transport is a movement of ions and other atomic or molecular substances across cell membranes without need of energy input. Unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.

Question 11

Active Transport

Answer 11

The movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.

Question 12

Endocytosis

Answer 12

The taking in of matter by a living cell by invagination of its membrane to form a vacuole.

Question 13

Exocytosis

Answer 13

A process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane.