How can we help?

You can also find more resources in our Help Center.

33 terms

Energy & Metabolism

Bio 103 Chapter 6
STUDY
PLAY
Each significant properties of a cell requires
Energy
Energy is defined as
the ability to do work
Free energy, is the difference b/t the internal energy or enthalpy and ___ or disorder
entropy
The process of influencing the chemical bonds in a way that lowers the ___ needed to speed up a chemical reaction, catalysis.
activation
Enzymes work most effectively at
optimum
Certain key molecules can regulate biochemical pathways by controlling the rates of enzymatic reactions by biding at ___ sites
allosteric
A series of sequential chemical reactions which are maintained in the cell are called:
biochemical pathways
A chemical reaction which requires energy is called an ___ reactions.
endergonic
A molecule that closely resembles the shape of a substrate for an enzyme might serve as a
competitive
Oxidation and reduction reactions are chemical processes that result in a gain or loss in
electrons
reactions that occur spontaneously and release free energy are called
exergonic reactions
A chemical reactioin in which the products contain less energy than the ___ will tend to proceed spontaneously.
reactants
Protein catalysts that speed up the various metabolic biological reactions in an organism are called
enzymes
Enzymes have specific ___ with which they interact
substrates
The active site is shaped so that only a certain
substrate molecule can fit into it
The inorganic non-protein components that participate in enzyme catalysis are known as
Go factors
The cheif energy currency of all cells is a molecule called
ATP
The chemistry of living systems representng all chemical reactions is called
metabolism
A calorie is the commonly used unit of chemical energy, it is also the unit of
heat
The term oxidation is derived from the name of the element oxygen. This reasonable, because oxygen
attracts electrons very strongly
When an atom or molecule gains one or more electrons, it is said to be
polarized
Life's ultimate source of energy is derived from
the sun
As energy is being reconverted through the many forms, it is continuosly lost as
heat
Reactions that do not proceed spontaneously because they require energy from an outside source called
endergonic
Molecules that act as catalysts in biological systems are
enzymes
Enzymes catalyze chemical reactions by lowering the
activation energy
In an enzyme catalyzed reaction the reactant is called the
substrate
The sites where molecules othe than substrates bind in an enzyme to alter its activity are called __ sites
allosteric
One of the most important coenzymes that accepts electrons/hydrogens is
NAD+
ATP gives up energy when it is converted to
ADP & phosphate
The regualation of simple biochemical pathways often involves the end product binding to the allosteric site of the first enzyme in the sequence, called
competitive inhibition
The First Law of Thermodynamics simply states
Energy can be neither created or destroyed
The Second Law of Thermoydynamics simply states
"high entropy"