Test #3: Plasma Membrane And Cell Structure

Front 1

What are the basic building blocks of plasma membrane?

Back 1

Phospholipids

Front 2

Are phospholipids hydrophilic or hydrophobic?

Back 2

They are both, the term is called Amphipathic

Front 3

Why is the term "fluid mosaic model" used to describe a plasma membrane?

Back 3

Because proteins in the membranes are like tiles in a mosaic. The phospholipid looks like the grout used to hold mosaic together, and the phospholipids have a fluid like consistency at normal body temperature.

Front 4

What is diffusion?

Back 4

The movement of molecules in solution from areas of high concentration to areas of lower concentration.

Front 5

What molecules can diffuse through a plasma membrane?

Back 5

1. Water

2. CO2

3. Oxygen

4. Small lipids

Front 6

What happens when phospholipids are put into water?

Back 6

They will spontaneously form a lipid bilayer

Front 7

What molecules MUST be transported through a plasma membrane?

Back 7

1. Glucose

2. Sucrose

3. DNA

4. Na+

Front 8

What happens when a cell is placed in an environment in which there is a higher oxygen concentration outside the cell than inside the cell?

Back 8

More oxygen molecules will enter the cell than leave the cell. They will flow out of the cell.

Front 9

A plant cell with an internal solute concentration of 3% is placed in a solution with a solute concentration of 5%. With respect to the interior of the cell, the surrounding solution is

Back 9

Hypertonic

Front 10

A plant cell with an internal solute concentration of 3% is placed in a solution with a solute concentration of 5%. The cell will

Back 10

Plasmolize and become flaccid

Front 11

Cholesterol is present in animal cell membranes but not in plant cell membranes. It serves

Back 11

To make the membrane fluidity independent of environmental temperature

Front 12

An animal cell with an internal solute concentration of 2% is placed in pure water (solute concentration = 0%). Water will

Back 12

Flow into the cell

Front 13

An animal cell with an internal solute concentration of 2% is placed in pure water (solute concentration = 0%). With respect to the interior of the cell, the surrounding solution is

Back 13

Hypotonic

Front 14

An animal cell with an internal solute concentration of 2% is placed in pure water (solute concentration = 0%). The cell will

Back 14

Burst

Front 15

How are active transport and facilitated diffusion similar?

Back 15

They both use transport proteins and they both move the same kinds of molecules

Front 16

Active transport is different than facilitated diffusion because it

Back 16

Requires energy

Front 17

Name dis

Back 17

1. Hydrophilic head

2. Hydrophobic tail

Front 18

What is the difference between hydrophilic and hydrophobic?

Back 18

Hydrophilic loves water while hydrophobic hates water.

Front 19

What term is used to describe the cell membrane?

Back 19

Fluid mosaic model

Front 20

Solutionswith greater pulling power (high solute, low water) are called

Back 20

Hypertonic

Front 21

Solutions with less pulling power (lowsolute, high water) are called

Back 21

Hypotonic

Front 22

Samepulling power on both sides of membrane

Back 22

Isotonic

Front 23

Let's take a look at a plant cell. Say the inside of the cell has 3% solute and it's placed in water with 7% solute.

Will water flow into or out of the cell? Is the cell hypertonic, hypotonic, or isotonic?

Back 23

Water will flow out of the cell. Cell is hypertonic.

Front 24

What happens when a cell is hypertonic for too long?

Back 24

It will become flaccid and eventually plasmolize. Plasmolize means to shrink.

Front 25

A cell with 2% solute inside the cell is placed in water that is 100% water so it has no solute.

Will water flow into the cell or out of the cell? Is the cell hypertonic, hypotonic, or isotonic?

Back 25

Water will flow into the cell. Cell is hypotonic.

Front 26

What happens if a cell is hypotonic for too long?

Back 26

Cell becomes turgid and can rupture

Front 27

How can you tell if a molecule must be carried by transport proteins?

Back 27

If the molecule is large, hydrophiloic, or if the molecule is an ion. Molecules that have a charge must also use a transport proteins.

Front 28

What is facilitated diffusion? Does it require energy?

Back 28

When molecules are moved using a transport protein down concentration gradient. Basically, moves with the flow, areas with high concentration to low concentration Does not require energy.

Front 29

What is active transport? Does it require energy?

Back 29

When molecules are moved using a transport protein against the concentration gradient. Moves against flow, areas from low concentration to high concentration. Requires energy.

Front 30

Molecules that have a charge must use a transport protein, name three of those molecules.

Back 30

Amino acids, sugars, and ions.

Front 31

What role does cholesterol play in diffusion?

Back 31

Cholesterol keeps hydrophobic molecule stiffer.

Front 32

What is osmosis?

Back 32

Opposite of diffusion, it is the movement of water from low concentration of solute to a high concentration of solute.