Unit 1: Enzyme Action and Inhibition Flashcards
what is a catabolic reaction?
a reaction that releases energy through the breakdown of a large molecule into smaller units
what is an anabolic reaction?
reaction that uses up energy to build up small molecules into large ones
what is metabolism?
the sum of all the anabolic and catabolic reactions
what is adenosine triphosphate made up of?
nitrogenous base - adenine
ribose sugar
three phosphate groups
what is the function of ATP?
to supply energy by hydrolysing ADP and pi
what is the activation energy?
energy needed to cause the molecules to react
what is glucose broken down to in animal cells during aerobic respiration?
CO2 and water and 38 ATP
what is glucose broken down to in animal cells during anaerobic respiration?
lactic acid ad 2 ATP
where does glycolysis take place?
in the cytoplasm
what is the net production of ATP molecules during glycolysis?
2
what process takes place in the matrix of the mitochondria?
kreb’s cycle
what is pyruvic acid converted to when it enters the mitochondria?
acetyl coenzyme A
what make up citric acid?
4 carbon compound and acetyl coenzyme A
name the enzyme involved in releasing carbon to produce carbon dioxide
decarboxylase
name the enzyme involved in releasing hydrogen?
dehydrogenase
where does the hydrogen transfer system occur?
cristae of the mitochondria
what is the end product of aerobic respiration
water
what its the final hydrogen acceptor?
oxygen
what instrument is used to measure respiration rate?
respirometer
How does an enzyme lower activation energy?
enzyme binds to the substrate and stresses some of its chemical bonds or binds to two substrates and forces them close together. theses effects lower activation energy (EA)
what happens to the speed and energy required for a chemical reaction without a catalyst?
the energy required is larger and the speed of the reaction is extremely slow
what is the function of protease?
hydrolysis of peptide bonds to break down proteins e.g. pepsin
what is the function of nuclease?
hydrolysis of phosphodiester bonds to break down nucleic acids e.g. EcoR1
what is the function of ATPase?
hydrolysis of phosphoester bond in ATP to form ADP and pi e.g.. sodium-potassium pump