Cell structure and function Grade 7

1. Prayer
Dear Lord, as we gather in this
classroom, may we ask for your wisdom
and wisdom. Help us to open our minds
to learning, to respect one another, and
to grow in understanding. Bless our
efforts and help us to use whatever we
learn here today to make the world a
better place. AMEN!

2. RECALL/ REVIEW

3. Cell Structure
& Function

4. Learning Competency:
 Identify Plant and Animal Cell according
to presence and absence of certain
organelles.
 Differentiate Plant cell and animal cell
using Venn diagram.

5. In the previous lesson, you have learned that
living things are organized. They are organized
so that all their roles are carried out smoothly,
so that they can work properly together. From
the smaller living things such as bacteria, life is
characterized by more and more complex levels
of organization. In this lesson, you will study
cells, the simplest unit of structure and function
of life.

6.  Do you know what cells look like?

7.  Do you think cell that is so small is important to the body?

8. What is a cell?
A cell is the basic unit of structure and function of
living organisms. A cell is the building block of all
organisms and it is the smallest unit of organization in
a living thing.
While cells differ in size and shape most of
them have common structures. The cells of
animals and pants and related organisms have
three basic structures

9. Cell
Membrane
the outer boundary of the cell, regulates
the entry and exit of materials in the cell

10. Nucleus
the control center of the cell,
contains chromatin that is made up
of DNA
Deoxyribonucleic Acid
– a genetic material
that is pass from one
generation to the next
generation.

11. Cytoplasma
material between the cell
membrane and the nucleus in
which the organelles are
found.

12. Nucleus
Cell
Membrane
Cytoplasma
The cells of animals and pants and
related organisms have three basic
structures

13. What are the two classifications of cells?
Eukaryotic and Prokaryotic
What organisms have
prokaryotic cells?
Here is a bacterium cell.
It is a prokaryote.
-A single celled
organism that lacks
nucleus and other
membrane-bound
organelles.
- Comes from a greek
word pro “before” and
with karyon, “nut or
kernel”
- Bacteria are the
prime example but
also included are the
blue-green algae

14. What organisms
have eukaryotic
cells?
- With true nucleus
- Those that have
eukaryotic cells
include protists,
plants, fungi, and
animals

15. Cell Theory
• All living things are made up of
cells.
• Cells are the smallest working
units of all living things.
• All cells come from preexisting
cells through cell division.

16. Cell
A cell is the smallest unit
that is capable of
performing life functions.

17. Examples of Cells
Amoeba Proteus
Plant Stem
Red Blood Cell
Nerve Cell
Bacteria

18. Two Types of Cells
•Prokaryotic
•Eukaryotic

19. Prokaryotic
• Do not have
structures
surrounded by
membranes
• Few internal
structures
• One-celled
organisms,
Ex. Bacteria

20. Eukaryotic
• Contain organelles surrounded by membranes
• Most living organisms

21. http://waynesword.palomar.edu/images/plant3.gif
“Typical” Plant Cell

22. Cell Parts
Organelles

23. Surrounding the Cell

24. Cell Membrane
• Outer membrane of cell
that controls movement
in and out of the cell
• Double layer
http://library.thinkquest.org/12413/structures.html

25. Cell Wall
• Most commonly found
in plant cells &
bacteria
• Supports & protects
cells
http://library.thinkquest.org/12413/structures.html

26. Inside the Cell

27. Nucleus
• Directs cell activities
• Separated from cytoplasm by nuclear
membrane
• Contains genetic material - DNA

28. Nuclear Membrane
• Surrounds nucleus
• Made of two layers
• Openings allow
material to enter and
leave nucleus
http://library.thinkquest.org/12413/structures.html

29. Chromosomes
• In nucleus
• Made of DNA
• Contain instructions
for traits &
characteristics
http://library.thinkquest.org/12413/structures.html

30. Nucleolus
• Inside nucleus
• Contains RNA to build
proteins
http://library.thinkquest.org/12413/structures.html

31. Cytoplasm
• Gel-like mixture
• Surrounded by cell membrane
• Contains hereditary material

32. Endoplasmic Reticulum
• Moves materials around
in cell
• Smooth type: lacks
ribosomes
• Rough type (pictured):
ribosomes embedded in
surface
http://library.thinkquest.org/12413/structures.html

33. Ribosomes
• Each cell contains
thousands
• Make proteins
• Found on ribosomes
& floating throughout
the cell
http://library.thinkquest.org/12413/structures.html

34. Mitochondria
• Produces energy through
chemical reactions –
breaking down fats &
carbohydrates
• Controls level of water and
other materials in cell
• Recycles and decomposes
proteins, fats, and
carbohydrates
http://library.thinkquest.org/12413/structures.html

35. Golgi Bodies
• Protein 'packaging
plant'
• Move materials within
the cell
• Move materials out of
the cell
http://library.thinkquest.org/12413/structures.html

36. Lysosome
• Digestive 'plant' for
proteins, fats, and
carbohydrates
• Transports undigested
material to cell
membrane for removal
• Cell breaks down if
lysosome explodes
http://library.thinkquest.org/12413/structures.html

37. Vacuoles
• Membrane-bound
sacs for storage,
digestion, and waste
removal
• Contains water
solution
• Help plants maintain
shape
http://library.thinkquest.org/12413/structures.html

38. Chloroplast
• Usually found in plant
cells
• Contains green
chlorophyll
• Where
photosynthesis takes
place
http://library.thinkquest.org/12413/structures.html