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BSC 203 Exam 3 Questions with Answers (100% Correct
Answers)
What does energy from sunlight or oxidation from foodstuffs
generate? Answer: - Energy molecules (ATP, NADH, FADH2)
- An electrochemical proton gradient to drive active transport, ATP
Synthesis and other energy processes
T/F: Both pyruvate and acetyl CoA can both be used to make glucose.
Answer: True
T/F: CO2 we breathe out comes from the Citric Acid Cycle? Answer:
True
Oxidation Answer: The LOSS of electrons by a molecule.
C6H12O6 + 6O2 ---> 6CO2 + 6H2O + Energy
Reduction Answer: The GAIN of electrons by a molecule.
6CO2 + 6H2O + Photons (light) ---> C6H12O6 +6O2
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Cellular Respiration Answer: The process by which anorganism
converts energy from sugars into cellularenergy, consuming oxygen in
the process.
C6H12O6 + 6O2 ---> 6CO2 + 6H2O + Energy (30 ATP)
What is the equivalent number of ATP molecules derived from
thecomplete aerobic oxidation of 1 molecule of glucose? Answer: 30
ATP
What type of reactions allow released energy to be stored? Answer:
Stepwise reactions.
Cells harvest energy from food in a controlled manner,thereby
converting it mostly to stored energy.
What are the 3 stages of catabolism of foodstuffs? Answer: 1. Digestion
2. Glycolysis (does NOT require oxygen)
3. Citric Acid Cycle and Electron Transport Chain (Requires energy)
Digestion Answer: - breakdown macromolecules by low pH and
enzymes
- occurs in digestive tract and within cells in lysosme
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,3
- does NOT generate energy
Glycolysis Answer: - breakdown of glucose molecules to pyruvate
- occurs in cytosol
- 10 enzymes
- does NOT require oxygen
- generates limited ATP & NADH
Citric Acid Cycle & Electron Transport Chain Answer: - Complete
breakdown of Acetyl CoA to CO2
- Occurs in mitochondria
- Involves both the Citric Acid Cycle and Oxidative Phosphorylation.
- The Citric acid cycle generates NADH, FADH2 (reducing power) and
GTP by oxidizing Acetyl groups to CO2.
- Oxidative phosphorylation (ETC) generates a proton gradient -
generates large amounts of ATP.
Role of mouth in digestion? Answer: Amylase secreted by cells in
salivary glands, hydrolyze starch
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, 4
Role of stomach in digestion? Answer: Proteases (pepsin-most active at
low H+) H+ & CL- are secreted by cells lining the stomach.
Proteases hydrolyze polypeptides.
Role of liver and pancreas in digestion? Answer: Bile produced by
liver emulsify fats and oils.
Pancreas produces lipases to hydrolyze fats and oils.
Role of large intestine in digestion? Answer: sugars, amino acids, and
fatty acids taken up by epithelial cells. transported throughout body
through blood.
structure of polysaccharides Answer: a polymer with lots of sugar
molecules
T/F: Cellulose is a dietary fiber and your body can't break it down.
Answer: True
T/F: Amylase can break the alpha 1,4 linkage in glucose molecules, but
not beta 1,4- beta linkages. Answer: True
T/F: Beta 1,4- linkages in polysaccharides are cleaved by cellulase only
produced by microbes. Answer: True
© 2025 All rights reserved
BSC 203 Exam 3 Questions with Answers (100% Correct
Answers)
What does energy from sunlight or oxidation from foodstuffs
generate? Answer: - Energy molecules (ATP, NADH, FADH2)
- An electrochemical proton gradient to drive active transport, ATP
Synthesis and other energy processes
T/F: Both pyruvate and acetyl CoA can both be used to make glucose.
Answer: True
T/F: CO2 we breathe out comes from the Citric Acid Cycle? Answer:
True
Oxidation Answer: The LOSS of electrons by a molecule.
C6H12O6 + 6O2 ---> 6CO2 + 6H2O + Energy
Reduction Answer: The GAIN of electrons by a molecule.
6CO2 + 6H2O + Photons (light) ---> C6H12O6 +6O2
© 2025 All rights reserved
,2
Cellular Respiration Answer: The process by which anorganism
converts energy from sugars into cellularenergy, consuming oxygen in
the process.
C6H12O6 + 6O2 ---> 6CO2 + 6H2O + Energy (30 ATP)
What is the equivalent number of ATP molecules derived from
thecomplete aerobic oxidation of 1 molecule of glucose? Answer: 30
ATP
What type of reactions allow released energy to be stored? Answer:
Stepwise reactions.
Cells harvest energy from food in a controlled manner,thereby
converting it mostly to stored energy.
What are the 3 stages of catabolism of foodstuffs? Answer: 1. Digestion
2. Glycolysis (does NOT require oxygen)
3. Citric Acid Cycle and Electron Transport Chain (Requires energy)
Digestion Answer: - breakdown macromolecules by low pH and
enzymes
- occurs in digestive tract and within cells in lysosme
© 2025 All rights reserved
,3
- does NOT generate energy
Glycolysis Answer: - breakdown of glucose molecules to pyruvate
- occurs in cytosol
- 10 enzymes
- does NOT require oxygen
- generates limited ATP & NADH
Citric Acid Cycle & Electron Transport Chain Answer: - Complete
breakdown of Acetyl CoA to CO2
- Occurs in mitochondria
- Involves both the Citric Acid Cycle and Oxidative Phosphorylation.
- The Citric acid cycle generates NADH, FADH2 (reducing power) and
GTP by oxidizing Acetyl groups to CO2.
- Oxidative phosphorylation (ETC) generates a proton gradient -
generates large amounts of ATP.
Role of mouth in digestion? Answer: Amylase secreted by cells in
salivary glands, hydrolyze starch
© 2025 All rights reserved
, 4
Role of stomach in digestion? Answer: Proteases (pepsin-most active at
low H+) H+ & CL- are secreted by cells lining the stomach.
Proteases hydrolyze polypeptides.
Role of liver and pancreas in digestion? Answer: Bile produced by
liver emulsify fats and oils.
Pancreas produces lipases to hydrolyze fats and oils.
Role of large intestine in digestion? Answer: sugars, amino acids, and
fatty acids taken up by epithelial cells. transported throughout body
through blood.
structure of polysaccharides Answer: a polymer with lots of sugar
molecules
T/F: Cellulose is a dietary fiber and your body can't break it down.
Answer: True
T/F: Amylase can break the alpha 1,4 linkage in glucose molecules, but
not beta 1,4- beta linkages. Answer: True
T/F: Beta 1,4- linkages in polysaccharides are cleaved by cellulase only
produced by microbes. Answer: True
© 2025 All rights reserved
