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Name:__________________________________________
Date:_____
Aim:__________________________________________________________
Do Now: Log into your discovery techbook, in the search box at the top, search
for "transport across cell membrane"
-Watch video
After you are done watching the video answer the following questions:
1. How are active transport and passive transport similar?
2. How are active transport and passive transport different?
3. Name an example of passive transport.
How can molecules that are too big to diffuse through the cell
membrane get into the cell?
Each group will get a plastic bag, a scissor, string, and candy. You must get the
candy in the bag by following these rules:
1. The candy must enter through a solid part of the bag.
2. The inside of the bag may not be directly open to the external environment.
3. Students may work with their hands in the bag to act as the inside of a cell.
4. The candy may be eaten only if it enters the bag "cell" under the specified
conditions.
I. Endocytosis
a) method of active transport that moves LARGE molecules INTO the cell
b) Cells absorb molecules by engulfing them
**What types of molecules are too large to pass through the cell without
energy? ______________________________________
How does the cell do it?
1. Cell membrane pinches together
2. Forms a vacuole around the molecule
3. Vacuole goes to ___________________ to release contents.
Challenge: Why would the vacuoles be sent to the lysosomes????
II. Exocytosis
a) method of active transport that moves molecules OUT of the cell
b) Cell releases molecules through secretion
**What is secretion?
How does the cell perform exocytosis?
1. Cell's nucleus direct vacuoles with large molecules to the cell membrane
2. Vacuoles attach to the cell membrane and release contents.
Endocytosis:
Exocytosis:
Transport Proteins- Proteins found embedded in the cell membrane (think like
the chips in a chocolate chip cookie” that move molecules from an area of
LOWER concentration to HIGHER concentration
**This is active transport because it is going against the natural flow of
molecules  molecules wants to flow from high to low. So going from low to
high requires energy **Think like riding a bike or running up hill.
**ALL of these methods require energy also known as ATP
What cellular process releases the energy (ATP) from glucose molecules?
In which organelle does this process occur?