1. Section 2-4 7th grade Life Science
Looking Inside Cells
Section 2-4
7th grade Life Science

2. specific functions within the cell
I. Introduction to Section 2-4
A. Organelles carry out _________________________________________________
II. Enter the Cell
A. Cell Wall — a rigid ___________________________________________________
1. The cells of animals ____________________________________________
__________________________________________________________________
2. A plant’s cell wall helps to ______________________________________
3. The cell wall is made of _______________________________________________
_____________________________________________________________________
4. Many materials, ______________________________________________________
B. Cell Membrane
1. All cells _______________________________________________________
2. The cell membrane controls ___________________________________________
III. Sail on to the Nucleus
A. You can think of the nucleus __________________________________________________
____________________________________________________________________________
B. Nuclear Envelope
1. The nuclear envelope __________________________________________________
2. Materials pass ________________________________________________________
_______________________________________________________________________
specific functions within the cell
layer of non-living material
do not have cell walls
Protect and support the cell
A strong material called cellulose
Many materials including water can pass through it
have cell membranes
what substances come into and out of a cell
As the cells control center , directing all of the cell’s activity
Protects the nucleus
In and out of the nucleus through pores in the nuclear envelope

3. C. Chromatin
1. Chromatin contains ___________________, the ____________________
__________________________________________________________________
D. Nucleolus
1. Is where _______________________________________________________
2. Ribosomes are the _____________________________________________
IV. Organelles in the Cytoplasm
A. The cytoplasm, the region ____________________________________________
B. Made up of a clear, thick, _____________________________________________
C. The fluid in the cytoplasm is __________________________________________
D. Mitochondria
1. Mitochondria are known as the __________________________________
E. Endoplasmic Reticulum
1. The endoplasmic reticulum’s passageways ______________________________________________-______________________
F. Ribosomes
1. Attached to some surfaces ______________________________________
2. Ribosomes function as _________________________________________
genetic material
instructions for
directing the cell’s functions
ribosomes are made
organelles where protein is produced
between the cell membrane and the nucleus
gel-like fluid
constantly moving
“powerhouses” of the cell
Carry proteins and other materials from one part of the cell to another
of the endoplasmic reticulum
factories to produce proteins

4.   In the space provided draw and label EITHER a plant cell or an animal cell. Use the information provided on pages 64 or 65.  

5. G. Golgi Bodies
1. The Golgi bodies ______________________________________________________
______________________________________________________________________ ______________________________________________________________________
2. The Golgi bodies also ___________________________________________
H. Chloroplasts
1. Only the cells of __________________________________________________
2. Chloroplasts capture ___________________________________________
3. Chloroplasts make ____________________________________________
I. Vacuoles
1. Vacuoles are ___________________________________________________
J. Lysosomes
1. Lysosomes are small ___________________________________________
2. Some chemicals break down ____________________________________
3. You can think of lysosomes as ___________________________________
Receive protein and other newly formed materials from the endoplasmic reticulum , package them, and distribute them to other parts of the cell.
Release materials outside the cell
plants and some other organisms that make their own food
Energy from sunlight and use it to make food
Leaves green
storage areas for cells
round structures containing chemicals
Large food particles, old cell parts,
the cell’s cleanup crew

6. V. Specialized Cells
A. Cells are often quite __________________________________________________
______________________________________________________________________
1. In many-celled organisms, ______________________________________
__________________________________________________________________
a. A tissue is ______________________________________________________________________ ______________________________________________________________________
b. An organ is made of ______________________________________________________________________
c. An organ system is a group ____________________________________________________________________
different from each other and are specialized to perform specific functions
Cells are organized into tissues, organs, and organ systems
a group of similar cells that work together to carry out a life process or perform a specific function
Different kinds of tissues that function together
of organs that work together to perform a major function

7. Answer Section 2-4 Assessment questions on page 67, numbers 1a, 2a, and 3b using complete sentences. Answer on your own paper.