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Biology - National 5
Biology Unit 1
Biology 1.2 - Transport Across Cell Membranes
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Cards (19)
What is the cell membrane?
selectively permeable
(only
certain molecules
are able to
pass through
)
What do the proteins look like in a cell membrane?
Large blob like structures
What do phospholipids look like in a cell membrane?
The
smaller tadpole like structures
What can move into the cell through the membrane?
Glucose
,
oxygen
and
amino acids
What can move out of the cell through the membrane?
Carbon dioxide
and
urea
Why can glucose move through a membrane but starch cannot?
This is because
starch molecules
are too
big
to move through the
membrane.
What way can you move (without using energy) on the concentration gradient?
From a
high
concentration to a
low
concentration
What is
diffusion
?
The
movement
of
molecules
from an area of
high concentration
to an area of
low concentration.
What does passive mean?
does not require energy
What is osmosis?
Movement
of
water molecules
from an area of
high water concentration
to an area of
low water concentration
What is active transport?
The
movement
of
molecules
or
ions against
the
concentration gradient.
What does active transport need to help it work?
Membrane proteins
along with
energy
What would happen if you put an animal cell into an area of high water concentration?
The cell would
swell up
and
burst.
(this is because there is no
support
from a
cell
wall
)
Water enters
the cell.
What would happen if you put an animal cell into an area of low water concentration?
The cell would
shrink.
Water
exits
the cell.
What would happen if you put a plant cell into an area of high water concentration?
The cell would become
turgid.
Water would
move into
the
cell
, the
vacuole
would
swell
and
press up
against the
cell wall.
What would happen if you put a plant cell into an area of low water concentration?
The cell would become
plasmolysed.
Water
exits
the cell, the
vacuole empties
and the cell membrane
moves away
from the
cell wall.
What is in a beetroot that colours it and where is that held in the cell?
Anthocyanin
is held in the
vacuole
by the vacuole
membrane.
What way can you move (using energy) on the concentration gradient?
From a
low
concentration to a
high
concentration, this is called
active transport.
How to find the percentage change in mass
Divide mass difference
by
original mass
and
times
by
100