Multiple choice questions: PLEASE ANSWER ALL 1) since G = H - TS in order for a
ID: 82430 • Letter: M
Question
Multiple choice questions: PLEASE ANSWER ALL
1) since G = H - TS in order for a reaction to occur spontaneously, S must
a) decrease along with T b) occur only in gram negatives c) release heat d) lead to increasing disorder e) = G
2) the activation energy of a reaction that occurs spontaneously is decreased by an enzyme via
a) co enzymes, b) allosteric sites, c) protein rigidity d) precise fit and charge e) none of the above
3) enthalpy does what to delta G when heat is absorbed during an endothermic reaction?
a) catalyzes b) decreases c) increases d) divides e) negates
4) chemiosmotic gradients consist of differences in
a) proton concentration only b) charge concentration only c) both proton and charge concentration
5) redox potential affects anaerobic metabolic activity by
a) allowing all forms of anaerobic metabolic activity when O2 is not present b) allowing all forms of anaerobic metabolic activity when O2 is present c) allowing more kinds of anaerobic metabolic activity at higher temperatures d) allowing more more kinds of anaerobic metabolic activity as E0 of the electron donor becomes more negative
6) CO2 is the end product of the TCA in aerobic respiration. CO2 can then be used in autotrophy and what in zones where microbial hydrogen production is supported
a) chemoheterotrophy b) organotrophy c) fermentation d) as a terminal electron acceptor e) reverse TCA
7) Biological nitrogen reduction for energy production is largely driven by
a) chemoheterotrophs b) chemoautotrophs c) organotrophs d) denitrifiers with their anaerobic respiration e) nitrogen fixers with their high O2
Explanation / Answer
Answer:
1) since G = H - TS in order for a reaction to occur spontaneously, S must
a) decrease along with T
b) occur only in gram negatives
c) release heat
d) lead to increasing disorder - Correct Answer (reactions are spontaneous when they lead to an increase in disorder, or entropy).
e) = G
2) the activation energy of a reaction that occurs spontaneously is decreased by an enzyme via
a) co enzymes,
b) allosteric sites,
c) protein rigidity
d) precise fit and charge
e) none of the above
3) enthalpy does what to delta G when heat is absorbed during an endothermic reaction?
a) catalyzes
b) decreases
c) increases -correct answer
d) divides
e) negates
4) chemiosmotic gradients consist of differences in
a) proton concentration only
b) charge concentration only
c) both proton and charge concentration - Correct Answer
5) redox potential affects anaerobic metabolic activity by
a) allowing all forms of anaerobic metabolic activity when O2 is not present
b) allowing all forms of anaerobic metabolic activity when O2 is present
c) allowing more kinds of anaerobic metabolic activity at higher temperatures
d) allowing more more kinds of anaerobic metabolic activity as E0 of the electron donor becomes more negative
6) CO2 is the end product of the TCA in aerobic respiration. CO2 can then be used in autotrophy and what in zones where microbial hydrogen production is supported
a) chemoheterotrophy
b) organotrophy
c) fermentation
d) as a terminal electron acceptor
e) reverse TCA
7) Biological nitrogen reduction for energy production is largely driven by
a) chemoheterotrophs
b) chemoautotrophs
c) organotrophs
d) denitrifiers with their anaerobic respiration - Correct Answer
e) nitrogen fixers with their high O2
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