BIOL 118 Lecture Notes - Lecture 8: Conformational Change, Allosteric Regulation, Phosphorylation

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chocolatetortoise260

13 Oct 2016

School

Binghamton University

Department

Biology

Course

BIOL 118

Professor

Jeane Lawless

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Document Summary

8 energy and enzymes: an introduction to metabolic pathways. Ke is energy of motion and molecular level is thermal energy. Pe is the energy of position or configuration. Free energy is the amount of energy available to do work. Chemical potential energy in cells, electrons are most important source. Amount of pe is based on its position relative to positive and negative charges. Electrons closer to negative charges and farther from positive charges have higher potential energy. Molecular potential energy is a function of electron configuration and position. First law of thermodynamics-energy is conserved: cannot be created or destroyed. Enthalpy is the total energy of a molecule represented by h. The pe of a molecule and the effect of the molecule on the surrounding pressure and volume. Changes in enthalpy are represented by deltah. Exothermic reaction releases heat and products have less pe than reactants. Endothermic reaction gains heat and products have higher pe than reactants.

Related Questions

All True orFalse

6.___ During the process of human fermentation the pyruvatemolecule produced at the end of glycolysis is converted into athree carbon molecule called ethyl alcohol while NAD+ is reduced toNADH and a CO2 molecule is released to the atmosphere.

7.___ The proton pumps of the inner membrane of themitochondrion are examples of integral transmembrane,active-transport carrier proteins.

8.___ Photosynthetic pigment molecules of plants are able torelease electrons to an ETC that are utilized to power the eventsof chemiosmosis.

9.__ Photoautotrophs (plants) use inorganic CO2 molecules astheir carbon source for building organic molecules and they usepigment molecules as their proximate source of electrons for theprocess of chemiosmosis.

10.__ The overall process of the TCA/CAC is exergonic with theproduction of ATP molecules and NADH/FADH2 all having stored energyderived from the reactants.

11.__ If a chemical reaction is catalyzed by an enzyme then thereactants will be able to initiate a chemical reaction withslightly more activation energy and the reaction would beclassified as an endergonic process if the products have lessenergy than the reactants.

12.__ The chemical reactions of glycolysis, the Krebs Cycle (TCAcycle), and oxidative phosphorylation, are all processes that canonly be performed when O2 is present (aerobic conditions).

13.___ Photophosphorylation is a type of chemiosmotic processand it possesses a key component of electron transport a finalelectron acceptor and in this case an organic molecule (FEA).

14.___ The pigment molecules, that make up a component of thechloroplasts of a plant, absorb light best in the green wavelengthsand that is why the plants appear so green.

15.___ Features in common for oxidative phosphorylation andphotophosphorylation are an electron source from dinucleotideelectron carrier molecules and an inorganic final electronacceptor.

16.___ In the metabolic pathways we discussed one would expectto find a number of points where allosteric enzymes are associatedwith positive feedback and/or negative feedback systems, and insome systems the allosteric enzyme is affected by both types ofregulatory molecules.

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BIOL 118 Lecture Notes - Lecture 8: Conformational Change, Allosteric Regulation, Phosphorylation

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