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SR1001 (Module 2)

QuestionAnswer
SI unit for energy? Joule
How are joules measured? (kg*m^2)/s^2
What is 1 cal? 4.184J (energy required to heat 1g of water by 1 degree)
How is Power calculated? P = W/s, W = (kg*m^2)/s^3
First law of thermodynamics? Energy cannot be created or destroyed, but is transformed from one form to another without being depleted
What is the conservation of energy? Illustrated as body transforms energy in food to heat mechanical and chemical energy
What is potential energy? Bound in a specific form
What is kinetic energy? Harnessing of potential energy
Forms of energy? Chemical, mechanical, electrical, Heat, Light and nuclear
What is the process of releasing energy called? Exergonic
What is the process of taking in energy called? Endergonic
What is energy used for in humans? Mechanical work (muscle contraction, cell division), Chemical work (synthesis of molecules), transport work (diffusion, active transport), Electrical work (transport of charged particles, action potentials in nerves and muscles)
What do enzymes do? Act as biological catalysts, reduce activation energy, accelerate the rate of reaction
What do reaction rates depend on? pH, temperature and availability of substrates
What are enzymes mode of action? Lock and key mechanism, enzyme-substrate complex, enzymes allow lower temperatures and neutral pH
What are hydrolysis reactions? Catabolise complex organic molecules and split chemical bonds by adding H+ and OH- (Digestion)
What are condensation reactions? Reverse of hydrolysis
What are oxidation reactions? loss of electrons (hydrogen, oxygen and electrons)
What are reduction reactions? gain of electrons
What are redox reactions? reduction and oxidation at the same
What are nutrients? fuel for the body
Created by: user-2065564
 

 



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