Cell Transport Day 2

Cell Transport Day 2

Multiple Choice

Homeostasis

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• is the maintenance of a relatively stable internal environment

• is the maintenance of a relatively stable external environment

Multiple Choice

In the diagram, what is letter A?

• Phospholipid

• Phospholipid bilayer

• Cholesterol

• Carbohydrate

• Carrier or transport protein

Multiple Choice

In the diagram, what is letter G?

• Phospholipid

• Phospholipid bilayer

• Cholesterol

• Carbohydrate

• Carrier or transport protein

Multiple Choice

In the diagram, what is letter E?

• Phospholipid

• Phospholipid bilayer

• Cholesterol

• Carbohydrate

• Carrier or transport protein

Multiple Choice

In the diagram, what is letter H-I?

• Phospholipid

• Phospholipid bilayer

• Cholesterol

• Carbohydrate

• Carrier or transport protein

Labeling

Drag and label the parts of the phospholipid bilayer.

Drag labels to their correct position on the image

hydrophobic

hydrophilic

How does stuff go into cells?

Just like larger, charismatic organisms, cells need stuff to live.

They need all the same things you'd think; food, water, atmosphere. They need to get rid of waste, too!

They achieve this through pulling molecules in or throwing them out in one of two ways:

ACTIVE TRANSPORT
-
or
-
PASSIVE TRANSPORT

Dropdown

The type of transport that requires energy to be used by the cell is probably

Select answer

What is passive transport?

PASSIVE TRANSPORT doesn't require energy. It moves molecules from an area of high concentration to an area of low concentration.
-
Examples include diffusion and osmosis

You already know that molecules are CONSTANTLY in motion, and they naturally want to go from an area of high concentration to an area of low concentration (no one wants to wait in a really long line) until they reach equilibrium. Diffusion is the name for this natural movement. By definition, Diffusion is the movement of any molecule from areas of high concentration to areas of low concentration.

Hotspot

Pick the ride that has the lowest concentration of people

Hotspot

Pick the side that has a higher concentration

Multiple Choice

Does diffusion require energy?

• Yes

• No

What is Osmosis?

Osmosis is a type of passive transport, specifically the diffusion of water across cell membranes.

We'll talk about it in a bit more detail in a little while.

Multiple Choice

Which of the following best describes diffusion?

• Movement of molecules from high to low concentration

• Movement of molecules from low to high concentration

• Movement of water only

• Movement of molecules using energy

How is diffusion like going downhill?

There is something called a concentration gradient. When you go down/across this gradient, it's like going with the flow or riding a bike downhill. You don't need to exert energy. It just happens.

Multiple Select

Which of the following statements about concentration gradients and diffusion are correct?

• Molecules move from high to low concentration.

• Diffusion requires energy.

• Molecules move down a concentration gradient.

• Diffusion leads to equilibrium.

Drag and Drop

Fill in the blank: Cell membranes that allow some materials to pass through but not others are said to be

Placeholder

permeable

Drag these tiles and drop them in the correct blank above

selectively

completely

impermeable

freely

passively

permeable

Match

Match the following to their job

• Maintains membrane fluidity

• Allows specific molecules to enter and exit the cell

• Defines the extracellular and intracellular areas

• Cell communication and signaling

Cholesterol

Protein

Phospholipids

Glycolipids

• Cholesterol

• Protein

• Phospholipids

• Glycolipids

Fill in the Blanks

Fill in the blank: The diffusion of water across cell membranes is called

.

So membranes have proteins...

Remember that the job of proteins in the membrane is to help certain molecules enter and exit the cell. This is a form of FACILLITATED DIFFUSION (basically, assisted diffusion). The most important molecule for cells to do this with to maintain homeostasis is water.

Draw

This diagram represents a beaker separated into two compartments by a membrane that is permeable only to water. Compartment A contains both sugar and water while compartment B contains only water molecules. Assume that the beaker has been allowed to stand overnight.

Indicate the direction of water movement by drawing arrows between compartments A and B.

Predict what would happen by drawing in the liquid levels you would expect to see in each compartment the next day.

HINT: EQUILIBRIUM

Multiple Choice

Do cells have more than water inside them?

• Yes

• No

Multiple Choice

Do cells live in areas that have more than just water?

• Yes

• No

Cells are like balloons. Sometimes they pop

Cells have water, sugars, proteins, salts, and other dissolved substances. As a result, the concentration of water outside cells is often greater than the concentration of water inside cells.

This can cause something called the OSMOTIC PRESSURE to increase. If it gets too high, the cell will pop/burst, like a balloon.

To stop this from happening, plant cells have cell walls to support them and prevent them from bursting. Many single-celled organisms, such as Paramecium, have organelles that pump excess water out of the cell. These organelles are called contractile vacuoles

Multiple Choice

What is the main force that causes a cell to swell when water enters it?

• Osmotic pressure

• Hydrostatic pressure

• Turgor pressure

• Atmospheric pressure

Can we stop it?

Multicellular organisms have to maintain a balance between the concentration of fluids inside and outside cells (AKA, we maintain an equilibrium, or homeostasis). In humans, for example, the concentrations of salts, sugars, and other ions are about the same inside cells as in the fluids surrounding them. So, water enters the cells of the body at the same rate that it leaves (homeostasis/equilibrium)

There are 3 types of environments.

In terms of water balance, there are 3 types of environments for a cell:

1. Isotonic

2. Hypertonic

3. Hypotonic

Dropdown

In a(n)​

Select answer

solution, cells act normally because the concentration of solutes (salt) and solvents (water) is the same inside and outside of the cell. In a(n)​

Select answer

solution, the cell shrivels and shrinks because the concentration of solutes (salt) is higher outside the cell so solvents (water) rushes out of the cell to try to create equilibrium. In a(n)​

Select answer

solution, the cell swells and bursts because the concentration of solutes (salt) is higher inside the cell than outside the cell, so the cell tries to bring in more solvent (water) to create equilibrium.

The three environments

In an​ isotonic​ solution, cells act normally because the concentration of solutes (salt) and solvents (water) is the same inside and outside of the cell.

In a hypertonic​ solution, the cell shrivels and shrinks because the concentration of solutes (salt) is higher outside the cell so solvents (water) rushes out of the cell to try to create equilibrium.

In a hypotonic)​ solution, the cell swells and bursts because the concentration of solutes (salt) is higher inside the cell than outside the cell, so the cell tries to bring in more solvent (water) to create equilibrium.

Multiple Choice

In a hypertonic environment, what happens to the concentration of dissolved substances and water outside the cell?

• Dissolved substances increase, water decreases

• Dissolved substances decrease, water increases

• Both dissolved substances and water increase

• Both dissolved substances and water decrease

Multiple Select

Osmosis Practice Activity: For the first diagram, what will happen?

• Water will flow: OUT OF THE CELL

• The cell will SHRINK

• Water will flow: INTO THE CELL

• The cell will BURST

Multiple Select

Osmosis Practice Activity: For the second diagram, what will happen?

• Water will flow IN BOTH DIRECTIONS

• The cell will STAY THE SAME

• Water will flow OUT OF THE CELL

• The cell will BURST

Multiple Select

Osmosis Practice Activity: For the third diagram, what will happen?

• Water will flow INTO THE CELL

• The cell will BURST

• Water will flow IN BOTH DIRECTIONS

• The cell will STAY THE SAME

Multiple Choice

When equilibrium is reached, molecules stop moving across a cell membrane.

• False
• True
• Partially true
• Depends on the type of molecules

Multiple Choice

Select all the correct effects of a hypertonic environment on a cell.

• Cell swells and/or bursts

• Cell shrinks

• Cell size remains the same

• Water moves into the cell at a faster rate

Multiple Choice

Which environment causes water to move into the cell, potentially leading to the cell swelling and bursting?

• Isotonic environment

• Hypertonic environment

• Hypotonic environment

• Acidic environment

Multiple Select

Which of the following statements about isotonic solutions are correct?

• The concentration of solute is the same inside and outside the cell.

• Water moves into the cell more than out of the cell.

• Cell size remains the same.

• The concentration of solvent is higher outside the cell.

Dropdown

The concentration of solvent is the same inside the cell than outside ​

Select answer

The concentration of solvent is greater in the cell than outside ​

Select answer

The concentration of solvent is greater outside the cell than inside ​

Select answer

The concentration of solute is greater outside the cell ​

Select answer

The concentration of solute is greater in the cell ​

Select answer

Dropdown

The concentration of solute is the same inside the cell & out ​

Select answer

The cell shrinks ​

Select answer

The cell swells & bursts ​

Select answer

The cell stays the same ​

Select answer