Summary
Summary AQA ALEVEL BIOLOGY NOTES ON ACTIVE TRANSPORT
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- Institution
ALEVEL NOTES ON THE CELL TRANSPORT TOPIC- ACTIVE TRANSPORT ADJUSTED TO THE AQA SPECIFICATION AND MADE FROM MARKSCHEMES
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= Active Transport→
Active transport is the movement of molecules or ions into or out of a cell from a
region
of lower concentration to a
region
of
higher concentration
using ATP and carrier
proteins .
What are the differences between active and
passive forms of transport ?
In active transport :
Metabolic in form of ATP is needed
energy
•
-
Substances are moved against a concentration gradient
Carrier protein molecules involved
-
are
Selective process BI9
-
] [
*
Process of Direct Active Transport
iiiiliiiiiiliiii if
, → . #
I:L?Igsie ↳
1-
Substrate binds to the carrier
2
ATP in of the cell
binds a specific binding site on the inside
3 ATPase of ATP ADPTP
region catalyses the breakdown to
conformational
4
Energy released causes
change
Protein shape to
push substrate across membrane
changes
-
Substrate
binding site non
complementary to ADPTP
-
-
ejected
binding
-
ATP site is
5 The to
phosphate molecule released from protein revert to its
original shape .
Outside cell Insidec
-
=
-
-
=
-
:{
-
s.CN :÷
AT7
Molecules bind
% I :÷÷ :÷:*
µ
.
•
transported . •
membrane protein •
,
inside cell -
-
-
=
-
=
{
-P ADP
↳~
r
of
Binding a
>
.
.
a
÷:÷:
.
"
÷:
.
conformation
change -
to the protein
-
-
-
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