Cellular Transport, Cells & Organelles Silber Science Biology Packet 2 Important Dates to remember: Cellular Transport Vocabulary Quiz Thursday, October 3, 2019 Cellular Transport Quiz: Friday, October 4, 2019 Naked Egg Lab Conclusion Paragraph Due: Monday, October 7, 2019 Cells Vocabulary Contract Due: Monday, October 7, 2019 Cells, Organelles and Transport Unit Test Review: Monday, October 7 2019 Cells, Organelles and Transport Unit Test: Tuesday, October 8, 2019 DO NOT THROW AWAY THIS PACKET! IT WILL BE VITAL TO STUDY FROM AND REVIEW FOR THE ENTIRE YEAR. KEEP IT SOMEWHERE SAFE!
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Before Learning
I Can After
Learning
1 I can identify cell organelles and state their functions.
2 I can define homeostasis
3 I can explain how cellular organelles function in maintaining homeostasis
4 I can identify how a cell would be affected if various organelles are missing or damaged
5 I can demonstrate and explain how osmosis, diffusion, endocytosis, and exocytosis are involved in maintaining homeostasis and why it is important
6 I can recognize and differentiate between active and passive transport
7 I can explain why cell membranes are selectively permeable
8 I can investigate how factors like size, charge, concentration, and temperature affect the rate of cellular transport and how the cell membrane is useful to the movement of
molecules across the concentration gradient as well as what a concentration gradient is.
9 I can compare and contrast how plant and animal cells respond to various tonicities and predict the movement of water into or out of the cell depending upon the tonicity of its
external environment. .
10 I can describe the parts of a solution and distinguish between hypertonic, hypotonic, and isotonic solutions.
B20 Standards Addressed in this Packet
1- SB1a Construct an example of how cell structures and organelles interact as a system to maintain homeostasis
4- SB1d Plan and carry out investigations to determine the role of cellular transport (i.e. active, passive and osmosis) in maintaining
Diffusion of water through a selectively permeable membrane
Diffusion (p. 260)
**passive transport
Process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated
Facilitated Diffusion (p. 261)
**passive transport
The process of diffusion in which molecules pass across the membrane through cell membrane channels
Active Transport
(264-65, 284
**active transport
The movement of materials against a concentration gradient. REQUIRES ENERGY.
Concentration Gradient
any imbalance in concentration. Moving down a gradient means that the particle is trying to be evenly distributed everywhere, like dropping food coloring in water.
Passive Transport
(p. 260-263)
movement of ions and other atomic or molecular substances across cell membranes without need of energy input
The membrane of the vesicle or vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell. The removal of water by means of a contractile vacuole is one example of this type of active transport.
Endocytosis (264-65)
**active transport
The process of taking material into the cell by means of infoldings, or pockets, of the cell membrane. Large molecules, clumps of food, and even whole cells can be taken up in this way.
Pinocytosis (p. 265)
**active transport
The taking up of liquid by the cell. Tiny pockets form along the cell membrane, fill with liquid, and pinch off to form vacuoles.
Phagocytosis (p. 265)
**active transport
Type of endocytosis in which extensions of cytoplasm surround a particle and package it within a food vacuole. The cell then engulfs it. White blood cells use this method to remove damaged or foreign cells and destroy them.
Extracellular
Outside of the cell
Intracellular Inside of the cell
Hypotonic (p. 262)
When comparing two solutions, the solution with the LESSER concentration of solutes
(p. 262) When comparing two solutions, the solution with the GREATER concentration of solute
Isotonic (p. 262)
When the concentration of two solutions is the same
Permeable Allowing liquids or gasses to pass through
Impermeable Not allowing liquid or gas to pass through
Selective Permeability
Property of biological membranes that allows some substances to pass across it while others cannot, also called semi-permeable membrane.
Phospholipid Bilayer (p. 257)
A double layered sheet called a lipid bilayer gives cell membranes a flexible structure that forms a strong barrier between the cell and its surroundings. Include fatty acid portions that have hydrophilic heads and hydrophobic tails.
Fluid Mosaic Model
(p. 257)
Because so many different types of molecules make up the cell membrane, scientists describe the cell membrane as a fluid mosaic. (Fluid because the molecules move along the membrane and mosaic based off of the type of art that involves putting bits and pieces of different colors or materials together).
Directions: Using your previous knowledge of the word “permeable” from your vocabulary activity, circle the images that you think water can pass into/through (what is permeable):
Pots and Pans The skin of a human being Bottles and other plastics
Plants and their roots Cotton clothing Bread
Glass items Paper items Vinyl Raincoat Define the word Permeable in your own words:
The Fluid-Mosaic Model of the Cell Plasma Membrane
The fluid-mosaic model describes
the plasma membrane of animal cells. The plasma membrane that surrounds these cells has two layers (a bilayer) of phospholipids (fats with phosphorous attached), which at body temperature are like vegetable oil (fluid). And the structure of the plasma membrane supports the old saying, “Oil and water don’t mix.”
Each phospholipid molecule has a
head that is attracted to water (hydrophilic: hydro = water; philic = loving) and a tail that repels water (hydrophobic: hydro = water; phobic = fearing). Both layers of the plasma membrane have the hydrophilic heads pointing toward the outside; the hydrophobic tails form the inside of the bilayer.
Because cells reside in a watery solution (extracellular fluid), and they contain a watery solution inside of them (cytoplasm), the plasma membrane forms a circle around each cell so that the water-loving heads are in contact with the fluid, and the water-fearing tails are protected on the inside.
Proteins and substances, such as
cholesterol, become embedded in the bilayer, giving the membrane the look of a mosaic. Because the plasma membrane has
the consistency of vegetable oil at body temperature, the proteins and other substances are able to move across it. That’s why the plasma membrane is described using the fluid-mosaic model.
The fluid-mosaic model of plasma membranes.
The molecules that are embedded in the plasma membrane also serve a purpose. For example, the cholesterol that is stuck in there makes the membrane more stable and prevents it from solidifying when your body temperature is low. (It keeps you from literally freezing when you’re “freezing.”) Carbohydrate chains attach to the outer surface of the plasma membrane of each cell. These carbohydrates are specific to every person, and they supply characteristics such as your blood type.
Literature sourced from: http://www.dummies.com/education/science/biology/the-fluid-mosaic-model-of-the-cell-plasma-membrane/
Background Information: Over the next 3 class periods, we will be tracking the journey of the naked egg. Our class has decided to name the egg ___________________ We will track ___________________’s journey using these data sheets to make hypotheses, descriptions, and measurements. Be as descriptive as possible . Attempt to make your drawing as accurate as possible. You are also welcome to snap a picture of it and bring it in printed out to paste to your data sheet at our next meeting.
Day 1: The Raw Egg *Nothing has been done to the egg on this day
Draw an image of the egg in the box to the left. Write a Verbal Description below (include texture, temperature, color, weight, and anything else you believe will be of value to this experiment)
At the end of day 1, gently place the egg in a container of white vinegar. Be sure to cover it with a ladle or other object to keep the egg below the liquid’s surface.
Description of the vinegar (color, smell, viscosity, etc.):
Write a hypothesis of what you believe will happen to the egg after sitting in the vinegar for
24 hours. You may wish to include: color change, weight loss/gain, smell, temperature change, textural change, etc).
The egg has just completed 24 hours of soaking in vinegar Was your hypothesis from Day 1 correct?Why or why not?
Day 2: The Vinegar Egg
Draw an image of the egg in the box to the left. Write a Verbal Description below (include texture, temperature, color, weight, and anything else you believe will be of value to this experiment)
At the end of day 2, gently place the egg in a container of corn syrup. Be sure to cover it with a ladle or other object to keep the egg below the liquid’s surface.
Description of the corn syrup (color, smell, viscosity, etc.):
Write a hypothesis of what you believe will happen to the egg after sitting in the corn syrup for 24 hours. You may wish to include: color change, weight loss/gain, smell, temperature
The egg has just completed 24 hours of soaking in corn syrup Was your hypothesis from Day 2 correct? Why or why not?
Day 3: The Corn Syrup Egg
Draw an image of the egg in the box to the left. Write a Verbal Description below (include texture, temperature, color, weight, and anything else you believe will be of value to this experiment)
At the end of day 3, gently place the egg in a container of MYSTERY LIQUID. Be sure to cover it with a ladle or other object to keep the egg below the liquid’s surface.
Description of the MYSTERY LIQUID (color, smell, viscosity, etc.):
Write a hypothesis of what you believe will happen to the egg after sitting in the MYSTERY
LIQUID for 24 hours. You may wish to include: color change, weight loss/gain, smell, temperature change, textural change, etc).
Transport Warmup: What is the definition of passive transport: What are the different types of passive Transport: What are the three types of tonicities? Which tonicity
Transport Part 3: Active Transport
Active Transport: the
active movement of molecules across a membrane into a region of HIGHER
concentration. ACTIVE TRANSPORT REQUIRES___________________________
Exocytosis: the active release of molecules from a cell.
Endocytosis: The process by which cells take in various molecules and particles by forming new vesicles made from the plasma membrane. There are three types:
“Cell Eating” The engulfing of large particles. The cell membrane wraps around the particles and encloses them, forming a vacuole. i.e.: white blood cells engulfing bacteria and dead cells
Pinocytosis: “Cell Drinking” The uptake of molecules. The ingestion of liquid into a cell by the budding of a small vesicle from the cell membrane.
Receptor-Mediated Endocytosis:
Enables a cell to take up very large quantities of a substance. Extracellular materials bind on the surface of a cell membrane and are drawn into vesicles. This is the way in which body cells take up cholesterol from the blood.
Sodium- Potassium Pump: carries particles or ions across a membrane
AGAINST the gradient. Uses______________. Since these types of transport is so costly in terms of
● Passive transport DOES NOT require energy ○ Three types: Simple diffusion, facilitated diffusion, osmosis ○ Molecules move from a higher concentration to a lower concentration along a gradient
● Active Transport REQUIRES energy. ○ Six examples: exocytosis and endocytosis (pinocytosis, phagocytosis, receptor-mediated
endocytosis, sodium potassium pump.
How does the cell membrane help to maintain homeostasis within the cell?
● Maintains a fluid phospholipid structure
● Regulates osmosis ● Maintains specific concentrations of
ions inside and outside the cell
Packet Summary: Can you:
1. Identify the Organelles in a model and state their functions and how they help to maintain homeostasis in addition to how the cell would be affected if the organelle was missing or damaged.
2. Define Homeostasis 3. Explain how osmosis, diffusion, endocytosis, and exocytosis are involved in maintaining homeostasis and why
it is important 4. Recognize and differentiate between active and passive transport 5. Explain why cell membranes are selectively permeable 6. Investigate how factors like size, charge, concentration and temperature affect the rate of cellular transport
and how the cell membrane is useful to the movement of molecules across the concentration gradient. 7. Explain what a concentration gradient is 8. Compare and contrast how plant and animal cells respond to various tonicities and predict the movement of
water into or out of the cell depending upon the tonicity of its external environment 9. Describe the parts of a solution and distinguish between hypertonic, hypotonic, and isotonic solutions.