SAS 7 QUIZ BIOCHEMISTRY LEC
This quiz includes topics from SAS 7, including the Krebs cycle and the electron transport chain.
Question 1
How many molecules of acetyl CoA, are produced from a single molecule of glucose for participation in the Krebs cycle?
3
2
1
4
Question 2
What molecule joins with acetyl CoA in order to produce citrate?
Fumarate
Acetyl CoA
Succunyl COA
Oxaloacetate
Malate
Question 3
Which of the following are high energy intermediates produced during the citric acid cycle?
NADH
NADH, FADH2
FADH2
NADH2,FADH
Question 4
Which molecule reacts with oxaloacetate (four-carbons) to form citrate (six-carbons) in the beginning of the citric acid cycle?
Carbohydrates
Proteins
Lipids
Acetyl CoA
Glucose
Question 5
Citric Acid Cycle occurs in the?
Mitochondria
Plasma Membrane
Cytoplasm
Cell Membrane
Cytosol
Nucleus
Question 6
Product of Carbohydrates that is used to make Acetyl CoA
Fatty acids
Glucose
Nucleic Acids
Citric Acid
Monocarbohydrates
Question 7
In the fourth step, the Alpha-ketoglutarate compound is oxidized and binds to coenzyme A, to form
Fumarate
Acetyl CoA
Succinyl COA
Oxaloacetate
Malate
Question 8
In the seventh step, Fumarate compound is converted to
Fumarate
Acetyl CoA
Succinyl COA
Oxaloacetate
Malate
Question 9
Isocitrate compound is oxidized to form alpha-ketoglutarate in the presence of
Aconitase
Fumarase
Alpha-ketoglutarate dehydrogenase complex
Isocitrate dehydrogenase
Succinyl-CoA synthetase
Question 10
Succinyl CoA is converted to succinate compound in the presence of
Aconitase
Fumarase
Alpha-ketoglutarate dehydrogenase complex
Isocitrate dehydrogenase
Succinyl-CoA synthetase
Question 11
Final product of ETC
water and ATP
Sugar
Electron
Protons
Question 12
ETC COMPLEX 2
Cytochrome c oxidase
Succinate–coenzyme Q reductase
Acetyl CoA
ATP
Question 13
ETC COMPLEX 4
Cytochrome c oxidase
Succinate–coenzyme Q reductase
Acetyl CoA
ATP
Question 14
What is oxidative phosphorylation?
It is the process of breaking down glucose into pyruvate to produce ATP.
It is the process by which ATP is synthesized from ADP as electrons and hydrogen ions are transferred from NADH or FADH₂ to O₂ through the electron transport chain.
It is the process of converting pyruvate into lactate during anaerobic respiration.
It is the process of synthesizing glucose from non-carbohydrate sources.
Question 15
Which statement correctly describes the difference between anabolism and catabolism?
Anabolism breaks down complex molecules to release energy, while catabolism builds complex molecules using energy.
Anabolism and catabolism both release energy for cellular processes.
Anabolism builds complex molecules using energy, while catabolism breaks down complex molecules to release energy.
Anabolism and catabolism both require energy to synthesize macromolecules.
Question 16
Which sequence correctly represents the four stages of energy metabolism in the body?
Digestion → Citric acid cycle → Electron transport chain → Acetyl group formation
Digestion → Acetyl group formation → Citric acid cycle → Electron transport chain and oxidative phosphorylation
Acetyl group formation → Digestion → Citric acid cycle → Electron transport chain
Citric acid cycle → Acetyl group formation → Digestion → Electron transport chain and oxidative phosphorylation
Question 17
Where does most enzymatic digestion and absorption of nutrients occur?
Mouth
Stomach
Small intestine
Large intestine
Question 18
In Step 1 of the citric acid cycle, which two molecules combine to form citrate?
Acetyl CoA and oxaloacetate
Acetyl CoA and pyruvate
Succinate and fumarate
Oxaloacetate and malate
Question 19
Which enzyme catalyzes the oxidation of isocitrate to α-ketoglutarate, producing CO₂ and NADH?
A. Citrate synthase
B. Aconitase
C. Isocitrate dehydrogenase
D. Fumarase
Citrate synthase
Aconitase
Isocitrate dehydrogenase
Fumarase
Question 20
Which complex of the electron transport chain is also known as NADH–coenzyme Q reductase?
Complex I
Complex II
Complex III
Complex IV