Lab test #3: metabolism and energy (power point) Flashcards
___ must gain external energy in order to counteract the increase in their entropy Photosynthetic
organisms use external ___ energy to maintain orderly structure
Non-photosynthetic organisms use stored___ in other living things to counter increasing entropy (disorder)
Living things
solar
chemical energy
Chemical reactions are processes that form or break ___ between atoms
Chemical reactions convert ___ to products
Reactants ——-> Products
chemical bonds
reactants
Exergonic reactions ___ energy
Reactants contain more energy than products in exergonic reactions
release
Exergonic reaction example: the burning of glucose
___ reactions require an input of energy
Products contain more energy than reactants in endergonic reactions
Endergonic
Endergonic reaction example: photosynthesis
___ molecules act as intermediates to carry energy between exergonic and endergonic reactions
Energy carrier molecules are only used ___ cells because they are unstable
___ is the most common energy carrying molecule
Energy carrier
within
Adenosine triphosphate (ATP)
The sum of all the chemical reactions inside a cell is its ___
Many cellular reactions are linked through ___
metabolism
metabolic pathways
Metabolic pathways proceed smoothly for three reasons:
Endergonic reactions are coupled with exergonic reactions
Energy-carrier molecules capture energy and transfer it between exergonic and endergonic reactions
Chemical reactions are regulated through protein enzymes
___ molecules are employed to catalyze (speed up) chemical reactions in cells
Enzyme
The main stages of glucose metabolism are:
Glycolysis
Cellular respiration