Class
Date
Name
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The Cell in lts Environment
Understanding Main ldeas
Fill in the blank to identify the process illustrated in each of the following figures
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Water moves out of the
cells of a saltwater fish
and into the ocean.
Oxygen moves from the
lungs into the
bloodstream.
Sodium is pumped aut
a nerue cell.
1.
2
3
of
Answer the following questions on a separate piece of paper,
4.
How does active transport differ from passive transport?
5. What makes the cell membrane selectively permeable?
Building Vocabulary
Match each term with its definition by writing the letter of the correot definition in the
right column on the line beside the term in the left column'
6.
_
osmosis
a. the process by which large molecules are engulfed
by
a cell
7
exocytosis
b. the process by which molecules tend to move from
8.
diffusion
c. the process by which
an area of higher concentration to an area of lower
concentration
large molecules are expelled
from a cell
9.
_
endocytosis
d. the process by which water moves across a selectively
permeable membrane
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Lesson 1.4 Answer Keys
Review and Reinforce
1.
osmoStS
2. diff usion
3. active transport
4. Active transport requires cellular energy,
passive transport does nc¡t.
5.
The cell membrane's double lipid layer means
that some materials can pass through it but
others cannot.
6. d
7. c
9.4
Lb
Lesson Quiz
1, 05rTrt5r5
2. Endocytosis
3, lipids
4. proteln charlrrels
5. cell membrane
6, transport proteins
7.
B
8. A
9.
D
10.
C