Download Performance Indicator 7.L.3A.3

Performance Indicator
7.L.3A.3
Develop and use models to explain how
the relevant structures within cells
function to support the life of plant,
animal, and bacterial cells
Organelles
Some cellular structures and their functions
include:
Cell membrane
• The thin, flexible outer covering of a cell. It
controls what enters and leaves a cell.
Organelles
• There are two main ways substances enter
and leaves a cell:

Diffusion is one way in which materials (for
example molecules of sugar, water or waste) move
across the cell membrane. It occurs as materials
move from an area of higher concentration to an
area of lower concentration (gradient)
http://www.youtube.com/watch?v=STLAJH7_zk
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Organelles
Osmosis is the diffusion of water across a
membrane.
http://www.youtube.com/watch?v=sdiJt
DRJQEc
Cytoplasm
• The gel-like fluid inside of a cell made of
mostly water.
• The other organelles are embedded in the
cytoplasm
• The cytoplasm is essential for many cellular
reactions to occur
Nucleus
• Contains the genetic material (DNA) and is the
control center of the cell
Vacuole
• Act as temporary storage centers.
• Some store water: others store waste
products until they can be eliminated from the
cell.
• Plant cells have fewer and larger vacuoles
than animal cells.
Chloroplasts
• Are the sites where photosynthesis takes place
in a plant cell
• They contain the chlorophyll, the green
pigment that absorbs light energy
• During the process of photosynthesis, plants
use light energy (sunlight), carbon dioxide
(CO₂), and water (H₂O) to make glucose, a
simple sugar (C₆H₁₂O₆) and oxygen gas (O₂)
Chloroplasts
• Plant cells also release oxygen gas (O₂) as a
waste product of photosynthesis
Mitochondria
• Are the energy producing sites in the cell
where respiration takes place
• It is sometimes called the “powerhouse” of
the cell
• All organisms, including plants and animals,
break down simple sugars (C₆H₁₂O₆) into
carbon dioxide (CO₂) and water (H₂O) to
release energy
Mitochondria
• The cell uses the energy to build, repair, and
reproduce cells
• Cellular respiration is the complementary
process to photosynthesis
• Cells that require a larger amount of energy to
function contain a larger number of
mitochondria
Cell wall
• Provides support and shape for plant cells. It
is made mostly of cellulose which provides a
protective framework for the cell
Lysosomes
• Organelles responsible for digesting certain
materials within the cell
• The lysosome can digest food, worn out
organelles, as well as other cellular waste not
needed for cell metabolism
Mitosis
• Cell reproduction begins with a process called
mitosis and occurs in the nucleus of the cell.
• Mitosis is a process of cell nuclear division
that enables a cell to make an exact copy of
itself
• Mitosis is needed for growth, replacement,
and asexual reproduction.
• http://glencoe.mheducation.com/sites/dl/free
/0078786789/164155/00053413.html
Textbook pages 49&51
• Copy Illustrations of photosynthesis and
respiration into your binder
• Use the card you were given to line up in the
correct order to form the equation for
photosynthesis or respiration. Good luck!
• http://www.quia.com/cb/273474.html?AP_ra
nd=1505884100