Download The Cell

First 10 minutes of class
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Cell Race
Review graphic organizer
Notes
Cell Test-Tuesday 10/2
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Smallest unit of all
living things
Composed of
organelles
Each organelle
performs specific
jobs so the cell can
do it’s job
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Cell membrane
Nucleus
nucleolus
Chromatin
Nuclear envelope
Microvilli
Cytoplasm
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Mitochondria
Golgi body
Endoplasmic
Reticulum
Ribosome
Centrioles
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Describe three organelles discussed yesterday
Three lines
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Discuss cell
Continue notes
Cell diagram and plasma membrane diagram
color and label
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The barrier surrounding each cell
Separates the cells contents from the
surrounding environment
Is selectively permeable
This is the cells way of maintaining
boundaries
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Phospholipid bi-layer
Meaning two layers
Each layer consists of
a lipid tail connected
to a phospo- head
The tails face each
other, away from the
external or internal
environments
 Hydrophobic
◦ The lipid tails are
water insoluble
◦ They are “water
fearing”
◦ They are non-polar
 Hydrophilic
◦ The protein heads of
each Phospholipid is
water soluble
◦ They are “water
loving”
◦ They are polar and
interact well with
other polar
substances
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1. Proteins
◦ a. Peripheral proteins act as binding sites or
receptors
◦ b. Integral proteins- proteins that span the
membrane act as transport protein
◦ c. Glycoprotein- act as markers, which allow your
cells to be recognized as “self” cells
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2. cholesterol
◦ Help to stabilize the plasma membrane
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Channel Proteins
◦ Passive movement of
material through
pores
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Carrier proteins
◦ Molecule will bind to
the carrier protein
causing it to open,
allowing passage into
the cell
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Use passive transport
◦ Do NOT require energy
◦ 1. diffusion- molecules move across membrane
through pores along a concentration gradient (high
to low)
◦ 2. filtration-movement of water and other solutes
from high to low concentration
 Based on a difference in water pressure between
external and internal environment
 Pushes out solutes
 Occurs in the kidneys
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Facilitated diffusion◦ concentration gradient still needed
◦ Protein carrier is used because molecules are too
large to enter pores
◦ Still passive transport, just needs help
◦ No energy because it is using a gradient
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Solute Pump (example Na/K exchange pump)
◦ Moves molecules or ions too large to enter on own
AGAINST a concentration gradient
◦ REQUIRES ENERGY (active transport)
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Several junctions
are present in order
for the cells to
continue doing
their jobs, while
communicating
with adjacent cells
all the while staying
anchored to each
other!
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Membrane junctions:
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Tight junctions
Desmosomes
Gap junctions
Microvilli