Tags & Description
metabolism
used to describe all of the chemical reactions inside a cell. need some kind of energy source and carbon to occur
catabolism
large molecules are broken down into smaller ones, releases energy. basis of digestion
anabolism
small molecules are assembled into larger ones, uses energy
photoautotroph
uses light as energy source and CO2 as carbon source (plants)
photoheterotroph
uses light as energy source and organic compounds as carbon source
chemoautotroph
uses chemicals as energy source and CO2 as carbon source
chemoheterotroph
uses chemicals as energy source and organic compounds as carbon source (humans, animals)
anything that eats something else to give itself energy is a
chemical energy source
plants and algae can get their energy from a
light energy source
phototroph
gets energy from light
chemotroph
gets energy from chemicals
autotroph
eating within yourself (CO2- inorganic compound)
heterotroph
eating something else (organic compounds)
autotrophs can turn gases (CO2- inorganic) into
physical carbon sources (organic)
energy carriers move
energy
ATP
adenosine triphosphate (adenosine molecule with 3 phosphates attached), "energy currency"
In ATP, the phosphate groups are held together by
2 high- energy bonds
the phosphates in ATP are all negatively- charged, which means the body
uses enzymes to force the negative bonds together. when broken, lots of energy is released.
ATP reaction
either solar or chemical energy
ADP + P
push 3rd phosphate molecule onto ATP (phosphorylation). travel wherever it needs to go then goes to break off one of the phosphate molecules. reaction keeps going in circles.
glycolysis, krebs cycle, oxidative phosphorylation, and fermentation get
chemicals or light and turn it into energy, store the energy as ATP, then the ATP turns monomers into polymers
endergonic reaction
requires an input of energy (turning ADP + P into ATP)
exergonic reaction
cause an output of energy (breaking of high energy bond). coupling of reaction that requires input of energy.
activation energy
amount of energy required to start a process
catalysts
lower the amount of energy required to make a reaction happen- activation energy
enzymes=
catalysts made out of proteins
what can humans not break down and use as an energy source?
cellulose
Enzymes
substrate enters active site of enzyme
substrate binds to the enzyme which changes the shape and decreases activation energy
substrate is converted to products
products leave the active site of the enzyme. the enzyme doesn't go away and it is not used. it will go back to its original state and do this process over and over again