Download Test Reveiw Chapter 6 KEY PowerPoint

Test Review Debrief
What have we learned about cells as
technology has improved? (example:
More powerful microscopes)
That cells are made of smaller organelles that
perform different functions for the cell (ex.
Mitochondria (provide power), ribosomes
(make proteins)
How are multicellular organisms
different from single-celled organisms?
Multicellular organisms (like you) have
specialized cells (liver, skin, bone, etc.) that
carry out different functions needed to
survive.
Allows multicellular
organisms to be much
larger than single-celled
organisms
#5
What structures do all cells contain?
All cells contain:
Cell membrane (selectively permeable: lets
some stuff in or out)
Cytoplasm (watery goo-like substance; fills
the cell like air in the room)
DNA (the cell’s instructions)
Ribosomes (Make the different proteins
needed by the cell to function)
macro
All three have a cell membrane but plants and bacteria also have a cell wall (made of different
materials). Bacteria (prokaryotes) don’t have a membrane-bound nucleus and are much
smaller and simpler. Plants have specialized water storage structures and chloroplasts.
#10
#13
This allows multicellular
organisms to be much
larger than single-celled
organisms.
What’s the Key Idea here? The next
few slides go over the key concepts
for the second part or the unit.
Cell Membranes are Selectively
Permeable (controls what enters and
exits the cell).This is how cells can
regulate what goes in and out of the
cell.
Why do eggs (w/o shell) expand in
distilled water and shrink in salt or sugar
water?
Osmosis!!!
An egg in distilled water will absorb water
through the membrane because the
concentration of water is higher outside the
egg than inside.
An egg in salt/sugar water will lose water
because the concentration of water is lower
outside the egg than inside.
#19
Active transport is the movement of a substance against its concentration gradient (from low to high
concentration). In all cells, this is usually concerned with accumulating high concentrations of molecules that the
cell needs, such as ions, glucose and amino acids.
Passive transport means substances across membranes. Unlike active transport, this process does not involve
chemical energy. So passive transport is dependent on the permeability of the cell membrane.
• The cell membrane or plasma membrane separates the interior of all
cells from the outside environment. The cell membrane is selectively
permeable to ions and organic molecules and controls the movement of
substances in and out of cell. It basically protects the cell from outside
forces
Heat energy (molecules moving
faster) helps speed up diffusion
Both liquids (urine and water) would spread out on
their own through diffusion using internal energy.
end show
How do I know if something is “living”?
It contains cells (one or more). ALL living
things contain cells!
It’s simple: Without cells = it’s not “living”.