MCB3020 Exam 2 Asghari UF Questions and
Answers 100% Correct
metabolism - ANSWER - the sum total of all the chemical reactions that occur within a cell
catabolic pathway - ANSWER - breaking down complex organic molecules into their smaller
subcomponents
which type of reactions are catabolic? - ANSWER - hydrolysis reactions
catabolic reactions are ________________________ - ANSWER - energy conserving reactions that
provide a ready source of reducing power (electrons)
anabolic reactions - ANSWER - the synthesis of complex molecules from their simpler subunits
which types of reactions are anabolic? - ANSWER - dehydration synthesis reactions
which reactions require energy from reducing power of electrons? - ANSWER - anabolic reactions
where do the anabolic reactions get their electrons for energy? - ANSWER - from catabolic reactions who
provide reducing power through electrons
how are microbes involved in elemental cycling? - ANSWER - nitrogen fixation, nitrification,
denitrification, and converting CO2 and CH4 to organic molecules
nitrogen fixation - ANSWER - when microbes convert unusable nitrogen gas (N2) to useful ammonia
(NH3)
, nitrification - ANSWER - conversion of ammonia (NH3) to nitrate (NO3)
denitrification - ANSWER - conversion of nitrate (NO3) to nitrogen gas (N2)
energy - ANSWER - defined as the capacity to cause change or do work
what are the 2 units of energy - ANSWER - calorie and joule
calorie - ANSWER - amount of heat energy needed to raise the temperature of one gram of water from
14.5 celsius to 15.5
joule - ANSWER - unit of work energy; 1 cal = 4.184 J
work - ANSWER - occurs when a force acts over a distance
what are the 3 kinds of work in cellular biology - ANSWER - chemical work, transport work, and
mechanical work
chemical work - ANSWER - the production of complex molecules from simpler ones
transport work - ANSWER - involves the elimination of waste, up take of nutrients, and maintenance of
ion balances within the cell
why is aerobic respiration very efficient - ANSWER - the Eo for glucose is very low and the Eo for oxygen
is very high
some microbes use methanol or acetate as _______ and Fe3+ or NO3- as _____ - ANSWER - electron
donors; electron acceptors
mechanical work - ANSWER - involves cell movement (motility) and movement of intracellular structures
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