Catalyst #4: December 8th, 2014

You received a slip at the door. On your Catalyst paper, identify each of the three solutions on the slip. (Hint: Look at the solute concentration outside of the cell. Ask yourself: Is that number higher or lower than inside of the cell?)

Agenda Catalyst (7 minutes) Tracking (8 minutes) Osmosis “Eggsperiment” Part 2: 10

minutes Osmosis Partner Relay: Remainder

Homework: Osmosis quiz tomorrow

Begin studying for Semester 1 exam

Announcements

Office hours tomorrowMastery slips available after school today

Unit 4.2: Guiding Questions

How does a cell make sure it has enough water and nutrients?

What happens to the cell in different environments?

How do cells take in the nutrients they need and release the substances they do not?

Eggsperiment Part 2

1. Get back in groups/Retrieve eggs. 2. CAREFULLY remove eggs from

solution. 3. One person will come use scales.

Record your egg’s new mass. 4. Class data collection

Partner Relay

With a partner, complete the CLASS COPY on your own sheets of paper.

December 9th, 2014

We will be taking our Osmosis quiz. You need a sheet of paper and writing utensil.

Agenda Quiz (10 minutes) Passive vs. Active Transport Notes and

Demonstration (15 minutes) CFUs (5 minutes) Passive vs. Active Transport Foldable( 14

minutes) Exit Ticket (Remaining)

Homework: Begin studying for Semester 1 exam Unit 4 Mastery Packets

Announcements

Office hours today after school Unit 4 mastery packets due December

15th (NEXT MONDAY)

Today’s SPI & Objectives

SPI 3210.1.8 Compare and contrast active and passive transport.

SWBAT compare and contrast passive and active transport in terms of molecule movement and energy usage

SWBAT distinguish between the two forms of passive transport

PASSIVE VS. ACTIVE TRANSPORT

Review Questions

What part of the cell controls what enters and leaves the cell? Cell/plasma membrane

What macromolecule is the cell membrane made up of? Lipids

What two words are used to describe the cell membrane? (S and P) Selectively (semi) permeable

Why is this important?

The cell must be able to bring in nutrients that it needs and remove substances that it does not need Brings in glucose and oxygen for energy Brings in or takes out sodium and

potassium ions for fluid balance Removes CO2 and water to prevent cell

damage or death

Types of Cellular Transport

There are two main types of cellular transport that bring molecules into and out of the cell Passive Transport Active Transport

Concentration

Review: Concentration is the relative amount of substance in a given area

Where is there a higher concentration of molecules in the picture?

Passive Transport

Key Point 1: In passive transport: Molecules move from high

concentration to low concentration This is called moving with or down the concentration gradient

Energy is not used

Additional Notes: Concentration Gradient

Concentration gradient = uneven distribution of a substance across a border

Example: Balloon has higher concentration inside; when you untie a balloon, air rushes out to reach dynamic equilibrium

Moving from high to low concentration with or down CG

Forced from low to high concentration against CG (Rolling a bolder up a hill)

Passive Transport

There are two specific forms of passive transport Diffusion Facilitated diffusion

Diffusion

Key Point 2: Diffusion is passive transport that does not require transport proteins to help move the molecules into or out of the cell High low concentration No energy Examples: Water and oxygen moving into the cel Through the phospholipid bilyaer

Diffusion Demonstration

Pay attention to how the molecules move

Raise your hand when you can smell the scent

Were energy or anything else used to move the molecules?

Facilitated Diffusion

Key Point 3: Facilitated diffusion is passive transport that does require transport proteins (channels or carriers) in the cell membraneto help move the molecules “Facilitate” means “to help” High low concentration No energy used Examples: Glucose and amino acids

moving into the cell

Active Transport

Key Point 4: In active transport: Molecules move from low

concentration to high concentrationThis is called moving against/up the concentration gradient

Energy must be used

Active Transport

Active transport uses transport proteins known as pumps to move the molecules across the cell membrane Example: Sodium-Potassium ATPase Pump

Additional notes: Example Sodium-ATP pump

Requires ATP to move sodium and potassium from areas from low concentration to high concentration

Uses channel/transport/embedded proteins to move through phospholipid bilayer

Must use ATP to change shape to get the molecules through

CFUs

Answer each of the next 6 questions on the blanks at the bottom of your notes

Do not call out answers! I will RANDOMLY call on someone to answer each one.

CFU 1

What type of transport moves molecules from low to high concentration?

Answer: Active transport

CFU 2

What type of cellular transport does not require energy?

Answer: Passive transport

CFU 3

In what direction do molecules move during passive transport?A. Into the cellB. From high to low concentrationC. From low to high concentrationD. Against the concentration gradient

Answer: B. From high to low concentration

CFU 4

Nerve cells need to take in sodium (Na+) ions. When do the sodium ions enter using active transport?A. When they are negatively chargedB. When they are too big to move through the

transport proteinsC. When they are moving against the

concentration gradientD. When they are moving with the concentration

gradient Answer: C. When they are moving against the

concentration gradient

CFU 5

Some molecules are brought into the cell with the help of transport proteins, but no energy is used. Is this an example of diffusion or facilitated diffusion?

Answer: Facilitated diffusion

CFU 6

Draw an arrow showing the direction the molecules would move during active transport?

Answer:

Passive and Active Transport: Foldable

Fold a piece of construction paper hot dog style. Cut two flaps.

Label one side “Passive Transport”; the other “Active Transport”

You may place “Both” either in the center of your two flaps or on the back

Place the bullet points in the correct place

Allows cells to bring in nutrients

Two types: Diffusion/Facilitated diffusion

With the concentration gradient

Low High Concentration Requires NO energy High Low concentration Requires energy (ATP) Against the concentration

gradient Uses transport protein

pumps Type of cellular transport

Exit Ticket

Answer the 3 questions below without your notes.

1. What type of cellular transport moves molecules against the concentration gradient?

2. What type of cellular transport does not require energy?

3. Amino acids move into the cell from high concentration to low concentration. Transport proteins help to move them. Is this passive or active AND if passive, is it diffusion or facilitated diffusion?