slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Chapter 6 PowerPoint Presentation
Download Presentation
Chapter 6

Loading in 2 Seconds...

play fullscreen
1 / 18

Chapter 6 - PowerPoint PPT Presentation


  • 110 Views
  • Uploaded on

Chapter 6. Ground Rules of Metabolism. Energy. Energy = capacity to do work Potential Energy—stored energy in resting object Kinetic Energy—energy of motion. Thermodynamics. 1 st Law of Thermodynamics: Energy cannot be created or destroyed Converted from one form to another

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Chapter 6' - elysia


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
chapter 6

Chapter 6

Ground Rules of Metabolism

energy
Energy
  • Energy = capacity to do work
  • Potential Energy—stored energy in resting object
  • Kinetic Energy—energy of motion
thermodynamics
Thermodynamics
  • 1st Law of Thermodynamics: Energy cannot be created or destroyed
    • Converted from one form to another
  • 2nd Law of Thermodynamics: Energy flows from organized to disorganized forms
    • Concentrated energy tends to disperse spontaneously
    • Moves from useable to non-useable energy
    • Chemical bonds resist this direction of energy flow
thermodynamics1
thermodynamics
  • Entropy: Measure of randomness or disorder in a system
    • Organized energy = useable = less entropy
    • Disorganized = not useable = more entropy
  • Living things must maintain ongoing replacement of lost energy
metabolism
metabolism
  • All chemical reactions within a cell or organism
  • Reactants
  • Products
            • +=
chemical reactions
Chemical reactions
  • Anabolic
    • Building reactions (dehydration synthesis)
    • Endergonic—need energy
    • A + B + Energy = C
    • Usually not spontaneous
  • Catabolic
    • Breaking down reactions (hydrolysis)
    • Exergonic—release energy
    • C = A + B + Energy
    • Usually spontaneous
chemical reactions1
Chemical Reactions
  • Activation Energy—minimum energy that can get a reaction to run on it’s own.
    • Cells control energy input into reactions, therefore controlling timing & speed of reactions.
chemical reactions2
Chemical reactions
  • Endergonic coupled with exergonic
  • Released energy from one fuels other

C = A +B + Energy

D + E + Energy = F

slide10
ATP
  • Energy source for cells
  • Created by photosynthesis or in mitochondria
slide12
ATP
  • Breaking down ATP releases energy
  • This powers cell fuctions
    • E.g. Active transport proteins
enzymes
ENzymes
  • Biological catalysts
    • Speed up chemical reactions
    • Don’t start reactions on their own
  • Reusable
  • Can catalyze in forward & reverse
  • Very specific!
enzymes1
enzymes
  • Lowers activation energy
    • Makes reactions faster & easier
controls over enzymes
Controls over enzymes
  • Concentration
    • Enzymes
    • Reactants
    • Products
  • Temperature
  • pH
  • Enzyme cofactors
    • vitamins
controls over enzymes1
Controls over enzymes
  • Inhibition
    • Competitive—binds to site first or more strongly
    • Non-competitive—binds to different area, changing enzyme bonding area
controls over enzymes2
Controls over enzymes
  • Feedback inhibition
    • Product of reaction binds to allosteric site
    • Shuts down reaction