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Created by
Harvey Kelleher
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Subdecks (2)
circulatory system
biology
26 cards
Cards (47)
how to test for
starch
,
protein
and
lipids
add food sample to
test tube
, add
solution
and shake
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what colour do
sudan
||| test turn if there is
lipids
?
red
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What test is for
proteins
?
Biuret test
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what colour do
biuret
test turn if there is
protein
?
purple
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what test is for starch?
Iodine test
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what colour do
iodine
test turn if there is
starch
?
black
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what test is for sugars?
Benedict's test
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what colour do benedicts test turn if there is
sugars
?
green yellow or red
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What is the main topic of today's video?
Osmosis
and its application to
cells
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What is diffusion?
Net movement of
particles
from high to low
concentration
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How do oxygen and glucose molecules enter a cell?
By diffusing down their
concentration gradient
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What is osmosis?
Diffusion of
water molecules
across a
membrane
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What does the term "water concentration" refer to?
Amount of water compared to
dissolved
solutes
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What are solutes in the context of water concentration?
Substances like
sugars
or
salts
dissolved in water
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How does solute concentration affect water concentration?
Higher solute concentration means
lower
water concentration
Lower solute concentration means
higher
water concentration
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If one beaker has one solute particle and another has three, which has higher solute concentration?
The
beaker
with
three
solute
particles
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What determines the concentration of water in a solution?
The
proportion
of water compared to
solutes
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How does osmosis occur in cells?
Water moves from higher to lower
water concentration
Occurs across a
partially permeable membrane
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What is the state of the outside solution in the cell example given?
Almost pure water
with
few solutes
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Why does water diffuse into the cell in the example?
Because the outside has higher water
concentration
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What is the process of water moving into the cell called?
Osmosis
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