Cell Membrane Review

Fluid mosaic model

A fluid structure with various proteins attached to a bilayer of phospholipids.

Isotonic solution

A solution at equilibrium, molecules move in and out of the cell (cell stays the same)

Hypertonic solution

A solution where there is more water inside the cell and the water will move out (cell gets smaller).

Hypotonic solution

A solution where there is more water outside the cell and the water will move in (cell gets bigger).

A selectively permeable membrane

Allows SOME substances to pass.

A permeable membrane

Allows substances to pass.

Levels of Organization (a-m/c-o-c-t-o-os-o)

Atom, molecule or compound, organelle,cell, tissue, organ, organ system, organism

Equilibrium

Concentration on both sides of the membrane are =.

What are the 2 types of active transport?

Endocytosis and Exocytosis

Hydrophobic

Fears or hates water.

What can move through the cell memberame in facilitated diffusion

H20 (Water)

In diffusion molecules move from...

High to low

During simple diffusion molecules moves from an area of _________ concentration to an area of ___________ concentration.

High, low.

Phospholipid bilayer (cell membrane)

Is made of two layers, which have water loving phosphate heads on the outside and water fearing lipid tails on the inside.

Hydrophillic

Loves water.

Endocytosis

Move large molecules, fluids, and other cells INTO cell.

Cell membrane

Outer covering of the cell, it is semi- permeable, which allows certain molecules to go in and out. Also known as the phospholipid bilayer.

Cell membrane structure...

Phosphate head, lipid tails.

2 types of endocytosis...

Pinocytosis (small bits of liquid) and phagocytosis (large particles)

Facilitated diffusion

Proteins in the cell membrane HELP to move particles across the membrane.

What is cell specialization?

The cell preforming a specific function for a particular organ or tissue.

Osmosis

The diffusion of WATER from a high concentration to a low concentration across a semi-permeable membrane.

Fecilitated transport

The movement of solute (too polar, highly charged or too big) across the membrane by a carrier.

Concentration

The number molecules of a solute in a given volume (density).

Diffusion

The process in which molecules move from a high concentration to low concentration.

Why do your fingles wrinkle after a long swim?

The skin cells absorb the water and the cells expan, making the skin have a wrinkled affect.

Cells form __________ which form __________ which make up __________ systems.

Tissues, organs, organ systems

Does facilitaed diffusion require protein to work? (True or False)

True

Passive transport

Type of transport that does not require energy but moves across the cell membrane.

Active transport

Type of transport that requires energy because molecules are being moved low concentration to high concentration.

Exocytosis

Vesicles in cytoplasm fuse with cell membrane and release contents OUT of cell.

When will molecules "stop" moving across the cell memberane

When they get to equilibrium.

Can a unicellular organism be both eykaryotic or prokaryotic? List an example.

Yes, bacteria and protozoa.

Do molecules keep moving after equilibrium?

Yes.