VWA science membrane quiz....7th grade
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| The cell membrane protects what? | The cell
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| Certain materials need to enter the cell. Some important materials a cell needs come through the membrane. Some are: | water, food, oxygen
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| The mebrane helps cells | get rid of waste and collect important materials(move in and out)
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| The membrane can be like a | gatekeeper-lets certain things in and out.
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| Between the lipids there may be | protein and carbohydrate molecules attached.
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| Carbs and proteins help by: | helping materials move through the membrane.
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| A membrane is selectively permeable. What does this mean? | certain substances are allowed to enter the cell while others cannot enter.
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| The structure of a cell membrane reflects its: | function.
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| Fats do not mix with what? | water
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| the fat molecules on the membrane loves or does not love water? | loves water.
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| There are two types of transport: | Passive and active
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| Through passive transport what happens | materials like water, gases, or dissolved solutions, cross the membrane without using energy.
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| What are the 2 types of passive transport? | diffusion and osmosis.
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| What is diffusion? | The movement of materials from areas of high concentration to low concentration.
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| What types of molecules travel through diffusion? | Small and gas molecules.
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| Diffusion occurs until: | Both concentrations are equal.
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| How do molecules move: | molecules gather in an area, collide, and then push away.
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| Molecules that are too big to get across use: | facilitated diffusion.
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| What is facilitated diffusion: | The process in which proteins create a channel for the other molecules to pass through.
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| The molecules need | "assistance" because they are too fat.
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| What is an example of a molecule that uses facilitated diffusion? | Glucose.
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| It is a carrier protein:True or False | True
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| What is osmosis: | The diffusion of water molecules across a cell membrane(selectively permeable)
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| Osmosis is a form of: | Passive transport
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| Does osmosis use energy | No.
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| Under certain conditions, osmosis can cause water to move more quickly out than in. This results in: | the cytoplasm shrinking and the organelles in it pulling away from the membrane. If conditions don't change, the cells can die.
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| Sometimes when they have too much water they use what: | a pump-contractile vacuole.
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| An example is a | paramecium-constantly having water come in.
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| Is this passive transport | no
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| The paramecium's solution using the pump: | it pumps the water out using energy.
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| When substances move in and out of the membrane using energy it is | active transport.
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| In Active transport molecules move from areas of | lower concentration to higher concentration.-involves energy.
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| They move the opposite way due to | diffusion
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| What helps the substances move? | proteins
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| Substances that are "picked up" and carried are | Calcium, Potassium, and sodium.
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| Active transport includes: | Ion pumps, endocytosis, and exocytosis.
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| An ion pump is: | A pump that transports proteins and molecules from areas of lower concentration to higher concentration using energy.
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| When materials are too large too move through pumps.. they use | endo/exocytosis.
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| The process of endocytosis is: | a particle gets engulfed by the cell. The membrane then fuses and creates a vacuole(vessel or bubble) that is taken across the membrane into the cell where it spreads.
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| Does endocytosis use energy: | No
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| What are 2 things engulfed? | Bacteria and food
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| The opposite process is: | exocytosis
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| The cells use energy to; | get big molecules out of the cell.
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| Describe the procedure of exocytosis: | a vacuole fuses with the membrane and the membrane opens and spills out the contents. The membrane then fuses.
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| Does exocytosis require energy: | yes.
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