2-3 Science Notebook Moving Cellular Material
Lesson 3 Moving Cellular Material
Predict three things that will be discussed in Lesson 3. Read the headings, and look at the photos and illustrations. Write your predictions in your Science Journal.
Passive Transport
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List 2 functions of membranes.
.
1.
2.
.
Organize information about passive transport.
Passive Transport
Definition:
Depends on:
Example:
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Diffusion
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Assess information about diffusion. Read the statements
.
below. If the statement is true, write true on the line. If it is false,
rewrite the underlined portion of the statement so that it is true.
Diffusion is the movement of substances from an area of lower concentration to an area of higher concentration.
Diffusion continues until the concentration of a substance is higher inside a cell than outside a cell.
18 Cell Structure and Function
Lesson 3 | Moving Cellular Material (continued)
Osmosis--The Diffusion of Water
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.
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.
Complete the sentence about osmosis.
Osmosis is a type of
that involves
movement of
only through the cell
membrane.
Explain the process of facilitated diffusion.
Facilitated Diffusion
A molecule is too large to pass through a cell
membrane.
Cell uses two types of proteins.
proteins
pass large molecules through membrane by
proteins
pass large molecules through membrane by
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Active Transport
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Organize information about active transport.
. Active Transport
Definition: the movement of substances
through a
only by
can move substances from areas of
concentration to
concentration
used to bring in and take
out
Cell Structure and Function 19
Lesson 3 | Moving Cellular Material (continued)
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.
Compare and contrast facilitated diffusion and active
transport by writing yes or no in each empty box of the chart.
Description
Uses carrier proteins Transports materials across cell membrane Requires cellular energy Able to move materials from an area with lower concentration to an area with higher concentration
Facilitated Diffusion
Active Transport
.
Identify each process as either endocytosis or exocytosis.
Process
Description
Materials entering cell
Materials being expelled from cell
Cell Size and Transport
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.
Explain how cell size and transport are related. Underline the term that correctly completes each sentence.
As a cell grows, both its volume and surface area (increase/ decrease). Volume increases (faster/slower) than surface area. Eventually, the cell's membrane would be (too large/too small) to move enough materials into and out of the cell.
Cells are very small. Yet, as living things, they have the ability to grow. What keeps cells from growing to much larger sizes than they do?
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
20 Cell Structure and Function
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