Organelles
what is an Organelle?
A structure in the cell that has one or more jobs
What does unicellular mean?
Composed of one cell
What is homeostasis?
The need of an organism to stay stable
Active transport
requires extra energy
Once sperm fertilizes the egg
Zygote
what is the cell membrane for?
Controls what goes in and out of the cell
what does multicellular mean? and what does it do?
composed of many cells that may organize into tissues then organs then an organ system.
is the cell membrane selectively or semi permeable
selectively permeable
passive transport
requires no extra energy
stem cells
undifferentiated cells
Holds everything in place
Example of prokaryotic cells
Bacteria
What is the only polar molecule that can pass through the membrane
Water
Osmosis
the simple diffusion of water
two types of stem cells
Embryonic and adult stem cells
Holds the shape of the cell
All cells have... ( list all four )
Genetic material
Cytoplasm
Cell membrane
Organelles
what is an example negative feed back mechanism
Body temperature
the spreading out of molecules across a membrane
Embryonic stem cells
never been differentiated and are easier to work with
What do Ribosomes do?
They make proteins
Name two differences between prokaryotic and Eukaryotic cells.
P= unicellular. E= multi or unicellular
P= no nucleus. E= has nucleus
P= not membrane bound E= membrane bound
What is an example of positive feedback mechanism?
Child birth
Facilitated diffusion
a transport protein that helps to facilitate the diffusion of molecules that are to big to pass through the membrane on their own.
Adult stem cells
Cells found in adult bone marrow and are not as versatile as embryonic stem cells.