Cell Membrane
This protein is integrated in the cell membrane and allows large molecules to enter and exit the cell.
channel protein
What is the difference between positive and negative feedback?
positive: enhances a response
negative: brings back to normal levels
The 3 main types of active transport?
endocytosis, exocytosis, protein pump
this will flow during osmosis; this will flow during diffusion.
Water and solutes
A cell placed in salt water (hypertonic solution) will _____ (gain or lose) water
lose water
This is main structure of the cell membrane, composed of two layers.
phospholipid bilayer (or lipid bilayer)
List 3 forms of cell transport that move from high to low concentration
simple diffusion, osmosis, and facilitated diffusion
The active transport process when a cell like a paramecium expels water out of its vacuole
exocytosis
In area A, there are 9 molecules of F.
In area B, there are 10 molecules of F.
Through diffusion, molecule F will move from area _____ to area _________.
B to A (Diffusion moves small molecules from HIGH to LOW concentration)
The cell has 65% water and 35% solute.
The solution has 30% water and 70% solute.
Through osmosis, water will move ______________ (out of/into) the cell.
out of
This is the maintenance of a stable inside environment despite changing outward conditions.
homeostasis (the main function of the cell membrane)
Which feedback mechanism is most likely to be responsible if, when your blood sugar level rises, the level of sugar goes back down to a set point?
negative
The active transport process when a white blood cells takes in a bacterium.
endocytosis
The cell's shape will do this when plants cells are immersed in saltwater solution
shrink and plasmolyze
When plant cells are put in a hypotonic solution, water will flow ___________ the cell
into
This chain, attached to a glycoprotein, functions to be an ID tag for the cell
Carbohydrate chain
Cell membranes are selectively permeable. This means that...
they let only certain things in and out of the cell
The active transport process when a single cell organism like an amoeba takes in materials from outside the cell into the cell by engulfing it. Be specific
phagocytosis
This is a solution that has more solute than its neighboring solution
hypertonic
A solution that has less sugar (solute) than another solution is ______ (hypo, hyper, iso)
hypotonic
This cell structure provides fluidity and flexibility
cholesterol
The type of transport that does NOT require energy
Passive Transport
In area A, there are 11 molecules of H.
In area B, there are 13 molecules of H.
Through active transport, molecule H will move from area _____ to area _________.
A to B (Active transport goes from low to high concentration)
The cell has 65% water and 35% solute. The solution has 30% water and 70% solute. Through diffusion, dissolved substances (solute) will move ______ (into/out of) the cell.
into
In area A, there are 15 water molecules of W. In area B, there are 25 water molecules of W. Through osmosis, molecule W will move from area _____ to area _________.
B to A (osmosis - water moves from high to low)