Download Active Transport - stephen fleenor

Warm-Up (9/21)
On the piece of white paper from the back,
answer the following question.
Describe how the allosteric inhibitor below will inhibit (deactivate) the
enzyme. Describe in detail. Like, molecular detail. Like, maybe,
using the word “R group.”
using
Do not just say “…and
then the active site won’t
work.” That would be
lazy, and you’re in the
awesome zone, pal.
Surface Area: Revisited
Cells have internal
compartments lined
with phospholipid
bilayers like the
plasma membrane.
Surface Area: Revisited
How do membranebound organelles
contribute to a cell’s
size?
Life As We Know It
No membranebound organelles
Has membranebound organelles
Stupid, pathetic, worthless,
uncivilized, crappy, and
Diverse, awesome, and
VERY SMALL.
MUCH LARGER.
2 – 8 μm in
diameter
up to 100 μm in
diameter
common ancestor
of all life
Surface Area: Revisited
How do membranebound organelles
contribute to a cell’s
size?
Answer!
They increase the
surface area, allowing
cells to be bigger.
Internal Membranes
Membrane-bound
organelles also help
organize chemical
reactions.
enzymes
What good is an
enzyme if the
substrates are in a
different place?!?!?!
substrates
Example: The Lysosome “Trashcan”
The lysosome is a
membrane-bound
organelle that contains
digestive, metabolic
enzymes to break up
trash in the cell.
Lysosome enzymes are called
“hydrolytic” because they
cause hydrolysis. What is
hydrolysis the opposite of?
Active Transport
Transport across a
membrane that requires
energy, usually using the
energy molecule ATP.
What kind of biomolecule does
this look like, and how is it
different from what you’ve
seen?
Active Transport
Moves molecules or
ions (charged particles)
from LOW concentration
to HIGH concentration.
Independent Practice
Look at Figure 7.18 on p. 136 and read the caption, then
answer questions 1 and 2 in the yellow box on page 138.
“Sir, what’s a cotransporter?”
“Well the word is in bold on page
137, so maybe you should read
about it.”
Closure (9/21)
Explain two ways internal membranes
facilitate complex cellular interactions.
What would happen if the lysosome was
not compartmentalized by a membrane?
Scale
from 1-10