BIOL 1202 Lecture Notes - Lecture 7: Metabolic Pathway, Endergonic Reaction, Metabolic Waste

64 views3 pages
29 Aug 2016
Department
Course
Professor

For unlimited access to Class Notes, a Class+ subscription is required.

BIOL 1202
Lecture 7
Thermodynamics
Organisms are OPEN SYSTEM
They ABSORB ENERGY - light or chemical energy in organic molecules - release heat and metabolic
waste products.
LAW OF THERMODYNAMICS
1.Energy can be transferred and transformed but it cannot be created or destroyed
2.Every energy transformation makes the universe more disordered.
ENTROPY
A measure of disorder "S" a measure of randomness
More random a collection of matter the greater its entropy
Order can increase locally but there is an unstoppable trend toward randomization of the
universe
Increased entropy of universe takes that form of increasing heat.
ENERGY COUPLING
EXERGONIC - a net release of free energy; deltaG is negative , change in G is negative
ENDERGONIC- reaction: absorbs free energy from its surroundings delta G is positive
Reactions in closed systems eventually reach equilibrium and can do no work
Cell maintain DISEQUILIBRIUM because they are open with a constant flow of material in an out
of the call
A cell continues to do work throughout its life.
Catabolic pathways release free energy in a series of reactions.
2 types of METABOLISM
CATABOLIC - big molecules are broken down to smaller molecules
ANABOLIC - simple molecules becoming larger molecules
CATABOLIC PATHWAYS
Release free energy in a series of reactions.
Some reversible reactions of respiration are constantly being pulled forward.
ADENOSIN TRIPHOSPHATE
"Energy currency of the cell"
Couples exergonic reactions to endergonic reactions
CELLS DO mechanical transport and chemical work
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class