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