Metabolism Photosynthesis Cellular Respiration

receptivetrucksΜηχανική

27 Οκτ 2013 (πριν από 3 χρόνια και 7 μήνες)

159 εμφανίσεις

Metabolism

Photosynthesis

Cellular Respiration

Chapters 8
-
10

Warm Up


Please complete the chapter 8 pretest you
picked up when you came in.

Metabolism and Energy


Metabolism


Catabolism


Anabolism


Bioenergetics


Energy


Kinetic


Heat/Thermal


Light Energy


Potential


Chemical


Organisms are energy
transformers!

Thermodynamics


Thermodynamics


System vs. Surroundings


Isolated System vs. Open System


First Law of Thermodynamics

Thermodynamics


Second Law of Thermodynamics


Entropy (S
)


Spontaneous (Energetically Favorable) vs.
Nonspontaneous Processes

Think
-
Pair
-
Share


How does the second law of
thermodynamics help explain the diffusion
of a substance across a membrane?


Describe the forms of energy found in an
apple as it grows on a tree, then falls, then is
digested by someone who eats it.


If you place a teaspoon of sugar in the
bottom of a glass of water, it will dissolve
completely over time. Left longer,
eventually the water will disappear and the
sugar crystals will reappear. Explain these
observations in terms of entropy.


Gibbs Free Energy


Free Energy


ΔG = free energy of a system


-
ΔG = spontaneous reaction


+ΔG = nonspontaneous reaction


ΔG = 0 = Dead Cell (can do no work)


ΔG = ΔH


TΔS

ΔG =
ΔG
final



ΔG
initial



Enthalpy

Gibbs Free Energy


Endergonic vs. Exergonic Reactions


+
ΔG






-
ΔG








Non
-
Spontaneous Spontaneous


Warm Up Exercise


Glow in the dark necklaces are snapped in
a way that allows two chemicals to mix and
they glow. Is this an endergonic or
exergonic reaction? Explain.


In simple diffusion, H+ ions move to an equal
concentration on both sides of a cell
membrane. In
cotransport
, H+ ions are
pumped across a membrane to create a
concentration gradient. Which situation
allows the H+ ions to perform work in the
system?

ATP and Cellular Work


Three Types of Work


Chemical


Transport


Mechanical


Energy Coupling


Phosphorylated
Intermediate

ATP Hydrolysis


kh

ATP and Cellular Work

ATP Cycle


The body regenerates 10 million molecules
of ATP per second per cell!