UCI BIO 93 MIDTERM 2 EXAM
QUESTIONS AND CORRECT ANSWERS.
VERIFIED 2025/2026.
What is a metabolic pathway? - ANS A pathway that a molecule goes through, resulting in a
specific product.
What is metabolism? - ANS The totality of an organisms chemical reactions
Gibbs free energy - ANS Portion of a system that can perform work when temp and pressure
are uniform throughout the system.
What is a way to show change in free energy? - ANS
What does a negative Delta G mean? - ANS A process that is spontaneous
What does spontaneous mean? - ANS Means that a process will occur.
What happens to the energy in a exergonic reaction? - ANS It is released
What happens to the energy in an endergonic reaction? - ANS It is consumed in the reaction.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,True or False
A cell must have endergonic and exergonic reactions - ANS True
Is ATP Hydrolysis an exergonic or endergonic reaction? - ANS Exergonic
Mechanical and Transport work are what kind of reactions? - ANS Endergonic
Why does ATP hydrolysis release so much energy? - ANS All 3 phosphate groups ate neg.
charged, so there is mutual repulsion within all of them
What do enzymes do? - ANS Lower energy barriers to drive chemical reactions
What does the suffix -ase usually mean? - ANS An enzyme
How does an exergonic energy profile look like? - ANS
Enzymes are biological ___________ - ANS Catalysts
What is the site of cellular respiration in all eukaryotic cells? - ANS Mitochondria
In Biology, what is another word for the addition of electrons to a substance? -
ANS Reduction
In Biology, what is another word for the loss of electrons to a substance? - ANS Oxidation
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is cellular respiration? - ANS Catabolic reactions used to generate ATP
Where does glycolysis happen? - ANS In the cytosol
What is glycolysis? - ANS The breaking down of glucose into 2 molecules of a compound of
pyruvate.
What happens in the citric acid cycle? - ANS The breakdown of glucose to carbon dioxide is
completed.
What is stage 1 of cellular respiration? - ANS Glycolysis
What is stage 2 of cellular respiration? - ANS Pyruvate oxidation and citric acid cycle
What is stage 3 of cellular respiration? - ANS Oxidative Phosphorylation
What is the purpose of NADH? - ANS Transfers electrons from food to electron transport
chain.
Pyruvate is converted to what compound? - ANS Acetyl CoA
Where does the citric acid cycle occur? - ANS In the mitochondrial matrix
What happens in substrate-level phosphorylation? - ANS A substrate gives a phosphate to
ADP, making a product and ATP
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS AND CORRECT ANSWERS.
VERIFIED 2025/2026.
What is a metabolic pathway? - ANS A pathway that a molecule goes through, resulting in a
specific product.
What is metabolism? - ANS The totality of an organisms chemical reactions
Gibbs free energy - ANS Portion of a system that can perform work when temp and pressure
are uniform throughout the system.
What is a way to show change in free energy? - ANS
What does a negative Delta G mean? - ANS A process that is spontaneous
What does spontaneous mean? - ANS Means that a process will occur.
What happens to the energy in a exergonic reaction? - ANS It is released
What happens to the energy in an endergonic reaction? - ANS It is consumed in the reaction.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,True or False
A cell must have endergonic and exergonic reactions - ANS True
Is ATP Hydrolysis an exergonic or endergonic reaction? - ANS Exergonic
Mechanical and Transport work are what kind of reactions? - ANS Endergonic
Why does ATP hydrolysis release so much energy? - ANS All 3 phosphate groups ate neg.
charged, so there is mutual repulsion within all of them
What do enzymes do? - ANS Lower energy barriers to drive chemical reactions
What does the suffix -ase usually mean? - ANS An enzyme
How does an exergonic energy profile look like? - ANS
Enzymes are biological ___________ - ANS Catalysts
What is the site of cellular respiration in all eukaryotic cells? - ANS Mitochondria
In Biology, what is another word for the addition of electrons to a substance? -
ANS Reduction
In Biology, what is another word for the loss of electrons to a substance? - ANS Oxidation
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is cellular respiration? - ANS Catabolic reactions used to generate ATP
Where does glycolysis happen? - ANS In the cytosol
What is glycolysis? - ANS The breaking down of glucose into 2 molecules of a compound of
pyruvate.
What happens in the citric acid cycle? - ANS The breakdown of glucose to carbon dioxide is
completed.
What is stage 1 of cellular respiration? - ANS Glycolysis
What is stage 2 of cellular respiration? - ANS Pyruvate oxidation and citric acid cycle
What is stage 3 of cellular respiration? - ANS Oxidative Phosphorylation
What is the purpose of NADH? - ANS Transfers electrons from food to electron transport
chain.
Pyruvate is converted to what compound? - ANS Acetyl CoA
Where does the citric acid cycle occur? - ANS In the mitochondrial matrix
What happens in substrate-level phosphorylation? - ANS A substrate gives a phosphate to
ADP, making a product and ATP
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
