lecture06 - Biology 172 Lecture 6: Monday, May 17, 2010...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Lecture 6: Monday, May 17, 2010 Biology 172 Today’s Outline Announcements My Office hours tomorrow 9-11 am Nat Sci. 2127B Review in Tuesday’s Discussion Exam 1 is Wed, May 19, In class 1-3pm (200 pts) Overview of Metabolism - Metabolic Lifestyles - Key Energy Carriers - Chemical Background Cellular Metabolism - Overview - Glycolysis - Fermentation
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Metabolism the sum of all chemical interactions in a cell metabolic reactions involve ENERGY EXCHANGE
Background image of page 2
3 Heterotrophs Photoautotrophs Two Major Metabolic “Lifestyles”
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 ATP consists of three phosphate groups, ribose, and adenine. Phosphate groups Ribose Adenine Energy is released when ATP is hydrolyzed. ATP Water ADP Inorganic phosphate Energy Key Energy-Carrying Molecules Figure 9.1 ATP – the energy “currency” of the cell • its phosphate bonds are hydrolyzed (RELEASES ENERGY) and regenerated (REQUIRES ENERGY) in metabolism
Background image of page 4
5 A review of how ATP drives cellular work
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 ATP A B Reactants Endergonic reaction (B gains P i from ATP) Exergonic reaction (Loss of P from ATP) A BP i “Activated” substrate (B losses P ) Energy is required to synthesize AB G AB Products Figure 9-3 Exergonic Phosphorylation Reactions are Coupled to Endergonic Reactions
Background image of page 6
7 NAD + Reduction Oxidation Oxidized Oxidized Nicotinamide Phosphate Ribose Phosphate Ribose Adenine Phosphate Phosphate Ribose Ribose Adenine Reduced Nicotinamide NADH (electron carrier) Reduced Key Energy-Carrying Molecules Fig 9.7 NAD+ (Nicotinamide Adenine Dinucleotide) • general e - acceptor in many reactions • NADH donates e - to the electron transport chain for ATP synthesis
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Chemical Background for Cellular Metabolism Watch for changes in covalent bonds Oxidation/Reduction reactions = Redox reactions Phosphorylation; especially Substrate-level Phosphorylation Chemiosmosis = mechanism for Oxidative Phosphorylation Metabolic Control Points; Allosteric Regulation
Background image of page 8
9 Oxidation-Reduction (Redox) reactions are coupled electron transfers
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 Redox Reactions LEO says GER NAD + + H 2 O --> NADH + H + + 1/2 O 2 Xe - + Y --> X + Ye -
Background image of page 10
11 Examples of Redox Reactions Na + Cl Na + + Cl - Ionization of salt H-C-OH + NAD + C=O + NADH + H + - A sugar loses 2 H atoms = 2e- and 2H + (becomes oxidized) NAD + gains 2e- and 1H + (becomes reduced) Na loses electron (becomes oxidized) Cl gains electron (becomes reduced)
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 Today’s Outline Overview of Metabolism - Metabolic Lifestyles - Key Energy Carriers - Chemical Background Cellular Metabolism - Overview - Glycolysis - Fermentation
Background image of page 12
13 Figure 9-6 Autotrophs Heterotrophs
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
14 Overview of Cellular Respiration C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + energy Overall Equation: the oxidation of glucose (and other fuel molecules) to generate useful energy Three Pathways by which this process occurs
Background image of page 14
15 An overview of cellular respiration Citric Acid Cycle
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 16
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 52

lecture06 - Biology 172 Lecture 6: Monday, May 17, 2010...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online