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Life, 4/e

Ricki Lewis, University of New York at Albany
Mariëlle Hoefnagels, University of Oklahoma
Douglas Gaffin, University of Oklahoma
Bruce Parker, Utah Valley State College

The Energy of Life

Chapter Quiz


1	True or false. Energy comes in different forms, although none can be converted from one form to another.
		A)	True
		B)	False


2	A calorie is the amount of energy required to raise the temperature of one ___________ of water __________ oC.
		A)	liter; 1
		B)	gram; 1
		C)	liter; 5
		D)	gram; 5


3	Most organisms ultimately obtain their energy from ____________.
		A)	the sun
		B)	geothermal energy
		C)	fossil fuels
		D)	the wind


4	Organisms that employ inorganic molecules to supply energy for the manufacture of nutrient molecules are called ___________.
		A)	photoautotrophs
		B)	heterotrophs
		C)	chemoautotrophs
		D)	decomposers


5	__________________ energy is stored energy, available to do work.
		A)	Solar
		B)	Kinetic
		C)	Potential
		D)	None of these is correct.


6	True or false. The first law of thermodynamics states, in part, that energy cannot be created or destroyed.
		A)	True
		B)	False


7	In all energy transformations, ______________.
		A)	entropy increases
		B)	some energy is lost as heat
		C)	events are irreversible
		D)	All of these are correct.


8	Metabolic pathways that produce large molecules from small ones are _____________.
		A)	catabolic
		B)	anabolic
		C)	degradative
		D)	digestive


9	The amount of energy stored in chemical bonds is ___________ energy.
		A)	thermal
		B)	kinetic
		C)	bond
		D)	None of these is correct.


10	The amount of stored energy potentially available to form new bonds is the _____________ of the molecule.
		A)	free energy
		B)	kinetic energy
		C)	thermal energy
		D)	entropy


11	In a(n) ___________________, the products contain more energy than the reactants.
		A)	catabolic reaction
		B)	reversible reaction
		C)	endergonic reaction
		D)	exergonic reaction


12	True or false. At chemical equilibrium, energy is neither gained or lost.
		A)	True
		B)	False


13	In a reduction reaction electrons are ______________ by an atom.
		A)	gained
		B)	lost
		C)	shared
		D)	repelled


14	True or false. Oxidation reactions tend to be coupled with reduction reactions.
		A)	True
		B)	False


15	At most, how many bonds of an ATP molecule can be broken to release energy?
		A)	1
		B)	2
		C)	3
		D)	4


16	Coupled reactions are advantageous to the cell because _______________.
		A)	only one enzyme is used
		B)	metabolism can be carried out at a faster rate
		C)	ATP is not needed
		D)	one reaction is used to drive the other


17	True or false. The transfer of a phosphate group is called phosphorylation.
		A)	True
		B)	False


18	True or false. Cofactors are organic molecules that aid in metabolism by acting with substances to facilitate certain reactions.
		A)	True
		B)	False


19	_______________ is derived from niacin (vitamin B3).
		A)	ATP
		B)	NADP+
		C)	FAD
		D)	NAD+


20	True or false. NAD+ is reduced when it accepts two protons as well as two electrons from a substrate.
		A)	True
		B)	False


21	What iron-containing molecules transfer electrons in metabolic pathways?
		A)	coenzymes
		B)	cofactors
		C)	cytochromes
		D)	vitamins


22	What type of proteins lower the activation energy of a reaction?
		A)	enzymes
		B)	cofactors
		C)	steroids
		D)	polypeptides


23	True or false. Low temperatures increase enzyme activity.
		A)	True
		B)	False


24	True or false. Noncompetitive inhibition occurs when the active site of a regulatory enzyme is bound.
		A)	True
		B)	False

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