AP Biology - Unit 3 Exam Latest Update
2025 With 100% Correct Questions And
Answers Assured Success
ATP -correct answer(adenosine triphosphate) main energy source that cells use for
most of their work
ADP -correct answeradenosine diphosphate; molecule that ATP becomes when it
gives up one of its three phosphate groups
free energy -correct answerChemical energy available to do work
substrate level phosphorylation -correct answerthe enzyme-mediated direct transfer of
phosphate from another molecule (the substrate) to ADP
reduction -correct answerGain of electrons by a chemical reactant; any reduction is
accompanied by an oxidation.
oxidation -correct answerRelative loss of electrons in a chemical reaction; either
outright removal to form an ion, or the sharing of electrons with substances having a
greater affinity for them, such as oxygen. Most oxidations, including biological ones, are
associated with the liberation of energy.
, oxidized -correct answerloses electrons
reduced -correct answergains electrons
NAD -correct answernicotinamide adenine dinucleotide - a coenzyme that is an
electron carrier; NAD+ is oxidized, NADH is reduced
reducing agent -correct answercompound that loses electrons in a reaction
oxidizing agent -correct answercompound that gains electrons in a reaction
cellular respiration -correct answerThe catabolic pathways by which electrons are
removed from various molecules and passed through intermediate electron carriers to
O2, generating H2O and releasing energy.
aerobic -correct answerRequiring molecular oxygen, O2
pyruvate oxidation -correct answerpyruvate molecules are oxidized and produces
acetyl-CoA, CO2, and NADH
citric acid cycle -correct answerIn cellular respiration, a set of chemical reactions
whereby acetyl CoA is oxidized to carbon dioxide and hydrogen atoms are stored as
NADH and FADH2. Also called the Krebs cycle.
energy-investing reactions -correct answerendergonic stage of glycolysis in which
glucose is converted into G3P
energy-harvesting reactions -correct answerexergonic stage of glycolysis in which G3P
is converted into two molecules of pyruvate
pyruvate -correct answerThree-carbon compound that forms as an end product of
glycolysis.
NADH -correct answerreduced electron carrier molecule formed in glycolysis
Krebs cycle -correct answeranother name for the citric acid cycle
acetyl CoA -correct answermolecule formed from the oxidation of pyruvate
FADH2 -correct answera reduced coenzyme similar to NADH, an electron carrier
anaerobic -correct answerOccurring without the use of molecular oxygen, O2.
fermentation -correct answerSpeaking specifically about energy metabolism, the
anaerobic degradation of a substance such as glucose to smaller molecules such as
2025 With 100% Correct Questions And
Answers Assured Success
ATP -correct answer(adenosine triphosphate) main energy source that cells use for
most of their work
ADP -correct answeradenosine diphosphate; molecule that ATP becomes when it
gives up one of its three phosphate groups
free energy -correct answerChemical energy available to do work
substrate level phosphorylation -correct answerthe enzyme-mediated direct transfer of
phosphate from another molecule (the substrate) to ADP
reduction -correct answerGain of electrons by a chemical reactant; any reduction is
accompanied by an oxidation.
oxidation -correct answerRelative loss of electrons in a chemical reaction; either
outright removal to form an ion, or the sharing of electrons with substances having a
greater affinity for them, such as oxygen. Most oxidations, including biological ones, are
associated with the liberation of energy.
, oxidized -correct answerloses electrons
reduced -correct answergains electrons
NAD -correct answernicotinamide adenine dinucleotide - a coenzyme that is an
electron carrier; NAD+ is oxidized, NADH is reduced
reducing agent -correct answercompound that loses electrons in a reaction
oxidizing agent -correct answercompound that gains electrons in a reaction
cellular respiration -correct answerThe catabolic pathways by which electrons are
removed from various molecules and passed through intermediate electron carriers to
O2, generating H2O and releasing energy.
aerobic -correct answerRequiring molecular oxygen, O2
pyruvate oxidation -correct answerpyruvate molecules are oxidized and produces
acetyl-CoA, CO2, and NADH
citric acid cycle -correct answerIn cellular respiration, a set of chemical reactions
whereby acetyl CoA is oxidized to carbon dioxide and hydrogen atoms are stored as
NADH and FADH2. Also called the Krebs cycle.
energy-investing reactions -correct answerendergonic stage of glycolysis in which
glucose is converted into G3P
energy-harvesting reactions -correct answerexergonic stage of glycolysis in which G3P
is converted into two molecules of pyruvate
pyruvate -correct answerThree-carbon compound that forms as an end product of
glycolysis.
NADH -correct answerreduced electron carrier molecule formed in glycolysis
Krebs cycle -correct answeranother name for the citric acid cycle
acetyl CoA -correct answermolecule formed from the oxidation of pyruvate
FADH2 -correct answera reduced coenzyme similar to NADH, an electron carrier
anaerobic -correct answerOccurring without the use of molecular oxygen, O2.
fermentation -correct answerSpeaking specifically about energy metabolism, the
anaerobic degradation of a substance such as glucose to smaller molecules such as
