Photosynthesis & Cellular Respiration

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Cellular Respiration + Photosynthesis

Filed under: Uncategorized — courtneystanifer at 5:06 pm on Tuesday, May 11, 2010

Question of the Day:

  • What does cell respiration and photosynthesis have in common?

Cell Respiration and Photosynthesis are in common because the products of each process are the reactants of the other

The demonstration of this is as follows:

  • Cell Respiration: O2+Glucose –> CO2+H2O+ATP
  • Photosynthesis: CO2+Light+H2O –> O2+Glucose

They are just switched backwards. ATP and Light are both the same because they are a sourse of energy for each process.

A good way to remember the difference between cellular respiration and photosynthesis is by this:

  • Photosynthesis takes in CO2, and releases O2
  • Cellular Respiration takes in O2, and releases CO2

cow_oxygencycle

Cellular Respiration…

Filed under: Uncategorized — courtneystanifer at 4:12 pm on Tuesday, May 11, 2010

Question of the Day:

  • What is cellular respiration?

Cellular respiration is a process that allows organisms to use the energy stored in glucose.

  • Energy in glucose is first used to produce ATP, which the cells use to supply energy needs
  • Occurs in the mitochondria
  • Produces the most energy

There are 3 steps in the Cellular Respiration process:

  1. The first step is glycolysis, which is the breakdown or splitting of glucose into two 3-carbon molecules (pyruvic acid)
  2. The second step is the Kreb’s cycle, which is where pyruvic acid is converted into CO2. This cycle is also called the citric acid cycle.
  3. The third step is electron transport chain, which is a system of electron carriers embedded in the inner membrane of a mitochondrion to transfer energy from electrons to O2 to form water.

 The Cellular Respiration equation is as follows:

  • O2+Glucose—>CO2+H2O+ATP

There are 2 types of Cellular Respiration:

  1. Aerobic-requires the use of oxygen
  2. Anaerobic-doesn’t require oxygen

Take the Cellular Respiration Quiz located on Links column

 

c9x6cell-respiration

all about photosynthesis…

Filed under: Uncategorized — courtneystanifer at 5:21 pm on Monday, May 10, 2010

Question of the Day:

  • What is photosynthesis?

Photosynthesis is the process by which plants, some bacteria, and some fungi use energy from sunlight to produce sugar.

  • Photosynthesis takes place in the plant organelle, chloroplasts.
  • The chloroplasts contain chlorophyll, which absorbs the sunlight.
  • From the sunlight, green plants combine carbon dioxide and water to to make sugar and oxygen.
  • The plants then use the sugar to make starch, fats, and proteins.
  • The carbon dioxide and oxygen leave the plant through tiny pores called stomata.

Play this photosynthesis game located on Links column

photosynthesis

The photosynthesis equation should help clarify the reactants and products of the process.

  • CO2 + H2O —> O2 + Sugar