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Cell Transport Name _________________________________________________________ Pd _________ Date __________ Selectively Permeable Membrane ______________________________ – a membrane that allows some molecules to pass through but not others Example: Passive Transport ______________________________ Active Transport ______________________________ - materials pass through a cell membrane without using energy. materials need energy to pass through a cell Membrane many Diffusion – movement of molecules from an area where there are __________ to an area few where there are __________ equilibrium Diffusion continues to happen until ____________________ is reached. evenly or equally Equilibrium – when molecules of a substance are spread ____________________ throughout an area Osmosis - passive water _______________ transport of _______________ through a selectively diffusion permeable membrane by _______________ Some molecules are too large to enter a cell by using passive transport so they must use active transport to enter the cell. protein carrier molecule Glucose needs a ______________________________ to enter a cell. energy active This is a type of _______________ transport because it uses ______________ low high Diffusion works by sending molecules from _______________ to _______________ levels low At times cells must work opposite of diffusion and send molecules from _______________ to high _______________ levels. energy active This requires _______________ so it is a form of _______________ transport Sometimes very large molecules use a specific type of active transport. endocytosis _________________________ - a large molecule enters the cell enclosed in a membrane. exocytosis _________________________ - a large molecule exits the cell enclosed in a membrane. Draw an arrow to show which direction the molecules would move under normal conditions. The diagram above is an example of what type of cellular transport? Cell Transport - Egg Lab Egg Short Circumference (To the nearest tenth of a cm) Long Circumference (To the nearest tenth of a cm) Detailed Observations Egg with Shell Egg with No Shell Egg in Corn Syrup Egg in Water Conclusion Questions: 1. In terms of water movement, explain and draw what happened to the egg after it was soaked in corn syrup for 24 hours. 2. In terms of water movement, explain and draw what happened to the egg after it was soaked in water for 24 hours. Cell Transport – Potato Lab Color Flexibility Detailed Observations Control Potato Potato in Salt Water Potato in Water 1. In terms of water movement, explain and draw what happened to the flexibility of the potato in salt water. 2. In terms of water movement, explain and draw what happened to the flexibility of the potato in fresh water. Do cells have mouths? Cell Transport – The Candy Problem How do you think large particles get into cells? Which cell organelle could be like a mouth? Materials: (Per Group) 1 plastic shopping bag, 1 pair of scissors, 2 twist ties, 1 piece of candy per student The Problem: You must get the candy into the bag according to the following rules. Once you have completed this task accurately show the final product to your teacher. Rules: The candy must enter through a solid part of the bag The inside of the bag may not be directly open to the external environment at any time. The candies entering the bag must remain clustered together At the end the candies will be clustered together and completely separate from the bag. Students may work with their hands in the top of the bag to act as the inside of a cell You may eat the candy only once I have approved your process 1. What process does this imitate in a cell? 2. Would this work in reverse? What would that be called?