Modern Biology 1
With Mrs. Haviland Room 222
Henry P. Becton Regional High School
East Rutherford, NJ 07073
CP Biology 1 Period 2 and 9
Chapter 7 Photosynthesis and Respiration Page 92
We often talk about "energy". But do you really know what I mean when I use that word? Energy can be defined as the ability to do work. Biologically speaking, we need energy inorder to stay alive. Our cells run our tissues which make up our organs and systems. Our cells have lots to "do". They need fuel. Sugar is the fuel. Remember glucose? That molecule is made through a process in plants (autotrophs) called photosynthesis (to make from light). Glucose is a carbohydrate with energy stored in the covalent bonds which make it stay together. Cellular respiration is the biochemical "pathway" or series of steps that breaks the bonds in glucose releasing the energy to do cellular activities like growing, moving, dividing etc. A special molecule called Adenosine Tri Phosphate (ATP) helps to convert the energy and store it for future use. The ADP-ATP cycle is one that we have discussed before and will again several time this year. It is Important!
