21 Questions
What does the Law of Conservation of Energy state in terms of energy balance?
Energy intake equals internal heat produced + work + storage.
How are catabolism and anabolism related in terms of metabolism?
Catabolism releases energy while anabolism requires energy.
Which category of biochemical reactions involves C-C bond making or breaking?
C-C bond making or breaking
In what way do living things differ from non-living systems in terms of thermodynamics?
Living things are unique thermodynamic systems.
Why aren't catabolism and anabolism simply considered as reverse processes of each other?
They operate in different pathways.
What role does stored chemical energy play in driving endergonic reactions?
Releasing energy to drive endergonic reactions.
Which coenzymes are tightly bound to the enzymes they serve as prosthetic groups?
FMN and FAD
For what purpose is NADPH primarily used?
Reductive biosyntheses
What does dietary deficiency of niacin cause?
Pellagra
Which coenzymes undergo reversible oxidation and reduction in many electron-transfer reactions of metabolism?
NAD and NADP
What happens to the concentration of NAD+ + NADH during the recycling of coenzyme?
No change
Which coenzyme consists of the structure above the dashed line on the FAD (oxidized form)?
FMN
Which of the following statements about ATP hydrolysis is correct?
A thermodynamically unfavorable reaction can be made favorable by coupling it to the hydrolysis of a sufficient number of ATP molecules.
Which of the following statements about nucleophilic reactions of ATP is incorrect?
Only the β- and γ-phosphorus atoms of ATP can serve as electrophilic targets for nucleophilic attack.
Which of the following statements about the flow of electrons in biological systems is incorrect?
The complete oxidation of glucose has a standard free energy change ($\Delta G^\circ$) of +2,840 kJ/mol.
Which of the following statements about coenzymes in biological redox reactions is correct?
Coenzymes such as NAD+ and FAD+ are specialized for carrying electrons released from redox reactions.
Which of the following statements about fats as fuel sources is correct?
Fats are a more efficient fuel source than carbohydrates like glucose because the carbon in fats is more reduced.
Which of the following statements about the firefly bioluminescence cycle is correct?
The firefly bioluminescence cycle is an example of a nucleophilic reaction involving ATP.
Which of the following biochemical reactions involves the breaking or making of carbon-carbon bonds?
Cholesterol biosynthesis
Which of the following statements about group-transfer reactions is incorrect?
Group-transfer reactions do not involve the transfer of inorganic orthophosphate (Pi) or inorganic pyrophosphate (PPi).
Which of the following statements about ATP is incorrect?
ATP provides energy solely through simple hydrolysis, not through group transfers.
This quiz covers topics related to the importance of energy changes, electron transfer, and metabolism in biochemistry. It includes concepts such as energy balance, biochemical reactions, ATP hydrolysis, biological redox, and more.
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