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Living Environment: Nature’s Sustainable Design

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Topic1.10.2

Active Transport, p. 40

Today’s Plan:

1. Warm Up (3 min)

2. Note Taking

3. How to Read A Scientific Text

4. Exit Slip

Today’s Objective:

Define active transport and list

examples of active transport in

cells.

FOCUS QUESTION: How do cells move things

against their concentration gradient?

Review- Passive Transport

Molecules move from high concentration to low concentration.

Diffusion and Osmosis.

Low Concentration

High Concentration

1. Active Transport When cells move materials against their concentration gradient (from low to high concentration.)

Low Concentration

High Concentration

2. Active Transport of molecules requires: • Energy in the form of ATP

• A specialized protein (often called a pump) to transport the molecule across the cell membrane PUMP

3. Sodium-Potassium Pump One example of active transport in cells is the sodium-potassium pump. This pump removes 3 sodium ions from the cell and brings 2 potassium ions into the cell. The cell has a relatively high concentration of potassium and a low concentration of sodium, so this goes against the concentration gradient.

4. Other Examples of Active Transport • Endocytosis: The cell takes in large particles by

surrounding them with the cell membrane and engulfing them. – Phagocytosis: “Cell Eating”

– Pinocytosis: “Cell Drinking”

Other Examples of Active Transport • Exocytosis: The cell gets rid of particles by

fusing vacuoles or vesicles with the cell membrane.

Reading A Scientific Text Step 1: Source

Where is the text from? What type of source is this?

This is an excerpt from a biology textbook.

Reading A Scientific Text Step 2: Purpose

Why are you reading this text? What type of information should you be looking for?

Reading A Scientific Text Step 3: Read and Annotate the Text

Underline Key Ideas that are important to what the text is saying [Put Brackets around passages that relate to

your purpose] Circle words you don’t know and look them

up Write a 1-2 sentence summary of the

information at the end of the article

Reading A Scientific Text Step 4: Connect

Why is active transport important for cells? Use quotes or evidence from the article to support your answer.

Unit 1.8 Homework When you have finished your Student Work, get a head start on the Unit 1.8 Homework!

Living Environment: Nature’s Sustainable Design

• HW 1.10 due Tuesday.

• Study more to edit your quiz on Tuesday.

• Lab Tuesday.

• If you did not finish plant lab complete that as well.

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Announcements

Exit Slip (5 min) 1. Return to your assigned seat

2. Complete the exit slip

3. Clean up your workstation

4. Secure all handouts in your binder

5. Put your binder away.

1. Fill in the blanks in the sentence below:

When a cell moves molecules from low to high concentration, this is ______________, but when a cell moves molecules from high to low concentration this is________________.

(Passive transport, active transport, diffusion, osmosis)