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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