BIO pre lab cellular respiration

What is the formula for Cellular Respiration?

C6H12O6 +6O2 = 6CO2 +6H2O +Energy

What two forms of energy make up the 686 kilocalories of energy per mole of oxidized glucose ?

ATP and heat / kinetic energy

What are specific things you could measure?

-Amount of

• O2 being consumed

• CO2 being produced

• amount of H2O being produced

• Amount of energy being produced

• Glucose being consumed 

For every molecule of oxygen being consumed, how many CO2s are being produced?

1 molecule of CO2

What is the purpose of a respirometer?

measure the volume as oxygen is being consumed by a germinating plant seed.

Usually, when a O2 is consumed during cell resp, it is replaced by CO2 gas, which would give no change in gas volume. however, CO2 is removed by something. What is it?

KOH ( potassium hydroxide)

What is the purpose of KOH

To turn the abosrbed CO2 into a solid

What is the formula for when KOH is used?

CO2 ( Gas ) + 2KOH ( liquid and caustic ) = K2CO3 ( Solid ) +H2O ( Liquid )

When O2 is consumed, what is the change in overall gas volume in the respirometer?

It decreases.

What factors can affect the rate of cell resp?

• temprature

• pressure

• amount of oxygen

• amount of carbon dioxide

When temperature and pressure are kept constant, what is the volume of gas proportional to?

It is directly proportional to the number of molecules in the gas

If temp and volume remain constant, what is the pressure of the gas directly proportional too?

the number of molecules in the gas.

If the number of gas molecules and temp remain constant, what is the relationship between the pressure and volume?

the pressure is inversly proportional ( opposite ) to the volume

If the temp changes and the number of gas molecules is constant, what happens to the pressure and/or volume?

The pressure and/or volume will change in direct proportion to the temp.

What happens to the volume of the gas when temp or pressure changes in the expirement. 

It will change based on the temp. High temp means larger volume, and low temp means smaller volume. 

If pressure and temp are constant in a respirometer containing KOH, will the volume of the gas increase or decrease is cell resp is taking place?

The volume of gas will decrease, because KOH is used to make CO2 solid, so it is taken out of the gas phase. As gas decreases, the volume of gas decreases.

Expiremental Hypothesis of Variable 1

If peas are germinated, then the rate of cellular respiration will be higher then the peas that are not germinated because the germinated peas are growing and need more energy ( ATP ) as opposed to the nongerminating peas.

Null Hypothesis for Variable 1 ( germinated vs non germinated )

If peas are germinated, they will have the same rate of cellular resp as the peas that are not germinated, 

Null Hypothesis for Variable 2 ( temp )

If the peas are kept in different temperatures, the rate of cellular resp will be the same for peas kept in room temp and peas kept in 10 degrees C.

Expirimental Hypothesis for Variable 2 ( Temp )

If the peas are being kept in room temp and 10 degrees C environment, the pease that are in the room temp will have a higher rate of cell resp then the peas kept in 10 Degrees C