John Bowne High School



Cell transport

Vocabulary:

Concentration gradient is a difference in the concentration (or amount) of a substance across a distance.

Diffusion is the movement of particles from a region (area) of high concentration of a substance to region (area) of low concentration.

Equilibrium is a condition or state that exists when things are balance or equal.

Osmosis is the diffusion of water through a semi-permeable membrane from an area of high concentration to an area of low concentration of water.

Solution is a mixture of solvent and solute.

Solvent is the liquid portion of a solution. Ex: water

Solute is the particle portion of a solution. Ex: Na+ ion, Cl- ion, glucose molecule, salt, etc.

Carrier protein is a protein that transports substances across a cell membrane.

Sodium-potassium pump is a carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell.

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How does simple diffusion differ from facilitated diffusion?

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What are two likely reasons a Cl- ion cannot pass through a sodium ion channel?

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What happens to a carrier protein when a molecule outside the cell binds to it?

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In which direction does water move when a cell is placed into a hypotonic solution?

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A cell is placed into a hypertonic solution. How does the concentration of water differ in the solution and the cell cytoplasm?

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Why do cells need active transport?

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What is the role of ATP in the sodium-potassium pump?

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What is the role of vesicle in endocytosis and exocytosis?

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1 The diffusion of water through a selectively permeable membrane is called osmosis. 2 Like other forms of diffusion, osmosis involves the movement of a substance—water—down its concentration gradient. 3 Osmosis is a type of passive transport.

4 If the solutions on either side of the cell membrane have different concentrations of dissolved particles, they will also have different concentrations of free water molecules. 5 That is because some of the dissolved particles, which are ions or polar substances, will bind with some of the water molecules. 6 Osmosis will occur as water molecules diffuse into the solution with the lower concentration of free water molecules.

7 Water molecules cannot move directly across the cell membrane. 8 That is because they are polar and repelled by the nonpolar interior of the cell membrane. 9 Water crosses the cell membrane by facilitated diffusion. 10 The cell membrane has channel proteins for water. 11 These channel proteins let only water molecules through.

1-How are diffusion and osmosis related?

2-What does the word water in Sentence 2 tell you about osmosis?

3-What happens to the concentration of free water molecules when a substance dissolves in the water?

4-Which sentence explains why dissolving substances affects water concentration? Summarize the reason in your own words.

5-Why can’t water move freely across a cell membrane? Which sentence gives the explanation for this?

6-What facilitates the diffusion of water across the cell membrane?

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Aim: How does transport happen across the cell membrane?

Or

How do things move in and out of the cell?

Standard 4

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Common Core Learning Standards for Literacy in History/Social Studies, Science, and Technical Subjects.

RST.11-12.4, RST.11-12.7, WHST.11-12.2a, WHST.11-12d, WHST.11-12.4.

INSTRUCTIONAL MODIFICATIONS FOR ELL/SP, ED, STUDENTS (IF APPLICABLE)

1-Provide dictionaries/glossaries

2-Provide alternate reading/writing material to differentiate task

3-Provide extra scaffolding for vocabulary attainment

4-Provide extra wait time for oral response to questions

5-Use of graphic organizers

6-Use more visuals through technology

- Instructional objectives: In addition to being provided with the opportunity to read, write, and speak in order to increase literacy….SWBAT

Objectives:

-Explain key vocabulary words

-Explain concentration gradient

-Explain passive transport

-Explain the concept of diffusion: simple diffusion & facilitated diffusion

-Explain channel protein & carrier proteins

-Explain an indicator

-Explain the concept of osmosis & semi-permeable membrane

-Explain active transport

-Explain endocytosis & exocytosis

Key Questions:

-What is a concentration gradient?

-What is passive transport?

-How does simple diffusion differ from facilitated diffusion?

-When does diffusion stop?

-Why can oxygen pass through the cell membrane by simple diffusion?

-What are two likely reasons a Cl- ion cannot pass through a sodium ion channel?

-What happens to a carrier protein when a molecule outside the cell blinds to it?

-What is osmosis?

-In which direction does water move when a cell is placed into a hypotonic solution?

-A cell is placed into a hypertonic solution. How does the concentration of water differ in the solution and the cell cytoplasm?

-What is active transport?

-Why do cells need active transport?

-What is the role of ATP in the sodium-potassium pump?

-What is the difference between endocytosis & exocytosis?

-What is the role of vesicle in endocytosis & exocytosis?

Assessing students’ prior knowledge, understanding, and misconceptions: (5-8 min)

Do Now: Write a sentence or more

Explain what is the major function of the cell membrane

Or

Explain what is a concentration gradient

Or

Expain the difference between active & passive transport

Aim: How does diffusion happen in a semi-permeable membrane?

Motivation/context: Show short Video

1-Plasma membrane (last 3 min), 2-Transport through cell membrane #2 (2 min), Passive & active transport through cell membrane (1 min).

Introduction of understanding (associate the new understanding with prior knowledge) (10-20 min)

-Reading comprehension “ out- loud” on “ What is a concentration gradient?” and underlining essential parts of reading, use smart board too.

-Solve problem question #3, #4,

Development of lesson (10-20 min)

-Reading comprehension “out-loud” on “What is Passive transport?” and underlining essential parts of reading, use smart board too.

-Solve problem on worksheet: How does simple diffusion differ from facilitated diffusion?

Check Point(s) Have students report to each other and /or to the entire class what they have learned as a check on the progress of the teaching by writing on the smart board. Ask key questions during the check point. (5 min)

Further development of lesson

Use page #2 for analyzing diagrams & reading comprehension “silently & out-loud” on simple & facilitated diffusion.

Underline essential parts in the reading section.

-Solve problem on worksheet:

-Problem question #5, #6, #7, #8

-What are two likely reasons a Cl- ion cannot pass through a sodium ion channel?

-What happens to a carrier protein when a molecule outside the cell binds to it?

Check Point(s) Have students report to each other and /or to the entire class what they have learned as a check on the progress of the teaching by writing on the smart board. Ask key questions during the check point. (5 min)

Homework: Rewrite all underline essential parts of the reading comprehension section.

Aim: How does diffusion & osmosis happen in a semi-permeable membrane?

Assessing students’ prior knowledge, understanding, and misconceptions: (5-8 min)

Do Now: Write a sentence or more

Explain what is a concentration gradient?

Or

Explain the direction of movement in diffusion

Or

Explain the direction of movement in osmosis

Motivation/context: Show short Video

1-Osmosis through membrane #4, 2-Plasma membrane (last 3 min), 3-Transport through cell membrane #2 (2 min),

4-Passive & active transport through cell membrane (1 min).

Introduction of understanding (associate the new understanding with prior knowledge) (10-20 min)

-Reading comprehension “ out- loud” on “What is Osmosis?” and underlining essential parts of reading, use smart board too. In this section explain an “indicator” too.

Or

-Reading comprehension “out-loud” on page 6

-Solve problem questions: #11

Development of lesson (10-20 min)

-Explain the vocabulary words of solute, solvent, & solution.

-Explain hyper, hypo, & iso-tonic solution in the process of osmosis.

-Analyze diagrams on page 3 and label & explain water concentration, & movement of it in osmosis.

-Reading comprehension out-loud on solution chart page 3.

-Solve problem questions on worksheet:

-In which direction does water move when a cell is placed into a hypotonic solution.

-A cell is placed into a hypertonic solution. How does the concentration of water differ in the solution and the cell cytoplasm?

Or

Answer all question on page 6

Check Point(s) Have students report to each other and /or to the entire class what they have learned as a check on the progress of the teaching by writing on the smart board. Ask key questions during the check point. (5 min)

Further development of lesson

-Explain what is an indicator

-Solve problem questions #9, #10, #12, #13

Check Point(s) Have students report to each other and /or to the entire class what they have learned as a check on the progress of the teaching by writing on the smart board. Ask key questions during the check point.

Homework: Rewrite all of essential underline notes & summarize video “osmosis through a membrane #4”.

Or

Summarize video plasma membrane, transport through cell membrane, passive & active transport through cell membrane.

Aim: How does active transport happen across a semi-permeable membrane?

Assessing students’ prior knowledge, understanding, and misconceptions: (5-8 min)

Do Now: Write a sentence or more

-Explain how energy is made in the cell & what is it used for

Motivation/context: Show short Video

-Passive & active transport through cell membrane

-Endocytosis & exocytosis = pinocytosis

Introduction of understanding (associate the new understanding with prior knowledge) (10-20 min)

-Explain active transport is against a concentration gradient that use energy

Development of lesson:

-Reading comprehension on “what is active transport?” & analyze diagrams on page 4

-Answer key questions:

-Why do cells need active transport?

-What is the role of ATP in the sodium-potassium pump?

-Question #1, #2

Check Point(s) Have students report to each other and /or to the entire class what they have learned as a check on the progress of the teaching by writing on the smart board. Ask key questions during the check point.

Further development of lesson

-Explain the difference between endocytosis and exocytosis

-Key question: What is the role of vesicle in endocytosis & exocytosis?

-Summarize transport of material through the membrane by solving the problems on page 5 & 6.

Homework:

-Rewrite all essential underline note and summarize video endocytosis and exocytosis.

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