Lab #4 Diffusion and Division
Describe the appearance of the red onion cells in the hypotonic solution (water)
The red union has expanded from the water coming in.
Describe the appearance of the red onion cells in the hypertonic solution (5% salt)
The red union has shrinked
Explain why the red union cells have this appearance in a hypertonic solution.
The water has went out. From high concentration to low concentration. High in the inside and low on the outside.
In calculating the change in weight of the potato over time
Weight of potato at time t - initial weight of potato = change in weight
Mitosis
a specific phase in the cell cycle , is when DNA separation occurs
osmosis
a specific type of diffusion that involves the movement of water from regions of higher water concentration to regions of lower water concentration across a selectively permeable membrane. The movement takes place by the natural tendency of water molecules to move from where they are in a greater quantity to where they are in a lesser quantity.
Cell must absorb and do what?
absorb nutrients, remove wastes, complete vital metabolic pathways, and reproduce. some of these activities require ATP energy and others take place due to the natural movement of molecules of molecules over time.
What is the effect of molecular weight (size) on the diffusion rate of a molecule?
The less the molecule weight, the faster diffusion rate of the molecule
look closely at the DNA because mitosis is the only part of the cell cycle where...
chromosomes are visible
how does concentration effect the diffusion rate of molecule?
high concentration leads to faster diffusion
When comparing two solutions, the one with more solute is called...
hypertonic solution
When comparing two solutions, the one with less solute is called...
hypotonic solution
When osmosis occurs, water always moves from the....
hypotonic solution to the hypertonic solution.
Remember:
less solute means more water in a solution and osmosis is the movement of water from a high water concentration to a low water concentration.
mitosis can be observed in the...
microscope
During interphase it still performs its normal activities and duplicating of DNA for ...
mitosis
is a 0.1% salt solution hypertonic or hypotonic to the potato cell?
0.1% salt solution is hypotonic to the potato cell
Diffusion vs. Osmosis
Diffusion is the tendency for molecules to move out into available space through spontaneous movement. Osmosis is the passive transport of water across a selectively permeable membrane.
Nuclear division occurs during...
Mitosis
Potassium Permanganate Molecular weight
158
Potassium Dichromate Molecular weight
294
Methylene Blue Molecular weight
320
is a 10% salt solution hypertonic or hypotonic to the potato cell?
Hypertonic
Part of the cell cycle that does not include mitosis
Interphase
Phases of mitosis
Prophase Metaphase Anaphase Telophase
dynamic equilibrium
Result of diffusion where there is continuous movement of particles but no overall change in concentration
cell cycel
series of events that cells go through as they grow and divide
molecular weight refers to its...
size. therefore the higher molecular weight indicates a larger size of a molecule.
solute vs solvent vs solution
solute: is the thing thats being dissolved. solvent: does the dissolving. solution; is the mixture of the solute and the solvent.
diffusion
spontaneous molecular movement from a region of greater concentration to a region of lower concentration. this movement is also referred to as passive transport because it does not require ATP energy to occur.
Molecular movement is essential to...
sustain life
What is the effect of temp. on diffusion rate of molecule?
the effect of temp. resulted that the ones in the refrigerator has slower diffusion rate.
diffusion happens in its own due to...
the inherent nature of molecular movement
to investigate the rate at which diffusion occurs in various conditions
we will use a petri dishes filled with agar. Agar is a polysaccharide material that serves as a fluid medium. This represents the selectively permeable nature of our cell membrane. Using these agar plates, we will tests the effect of molecular weight, temp., and size on the rate of diffusion.
result from the divison
when a single cell divides, the DNA must be replicated and split equally between the two cells