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SBI4U Metabolic Processes Exam Questions and Answers
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SBI4U Metabolic Processes ExamQuestions and Answers
what are the products of glycolysis for ONE molecule of glucose? - Answer-2 net ATP
2 NADH
H2O
2 pyruvate
What are the reactants of glycolysis for ONE molecule of glucose? - Answer-2 ATP
4 ADP
2 NAD+
glucose
2 inorganic phosphates
What are the products of pyruvate oxidation for one molecule of glucose? - Answer-2
NADH
2 Acetyl-CoA
2 CO2
What are the products of the KREBS cycle for one molecule of glucose? - Answer-2
ATP
6 NADH
2 FADH2
CO2
What are the major structures (peripheral/integral proteins) involved in the the ETC? -
Answer-In order:
NADH dehydrogenase
ubiquinone
cytochrome b-c complex
cytochrome C
cytochrome oxidase
ATP synthase
How is ATP produced in the cristae (Inner mitochondrial membrane)? - Answer-- the
electrons from NADH and FADH2 are pumped through complexes, the energy released
pumps H+ ions to the intermembrane space
- creates H+ ion gradient and increases proton motor force
- H+ ions move along [ ] gradient through ATP synthase complex into the matrix,
creating ATP
The electrons in the ETC are accepted by _____, and form _____ - Answer-Oxygen,
water
, Why is the actual # of ATP produced much lower than 36 or 38? - Answer-- Some
protons leak through membrane without passing through ATP synthase complex
- ATP used to transport pyruvate from cytoplasm to mitochondria
- Some E used to transport ATP out of mito. for use in cytoplasm
Healthy diet consists of more than just glucose. If you ate something that contained
protein (such as Alanine, glutamate), and fats, how would they be used for energy? -
Answer--Alanine: converted directed to pyruvate, glutamate can be converted to
intermediates in Krebs.
- glycerol: converted to G3P for glycolysis
- fatty acids: transported to mitochondria where carbon atoms are removed in pairs
creating Acetyl-CoA
What is the significance of phosphofructokinase? - Answer-Feedback control point:
when enough ATP is produced, excess ATP binds to allosteric binding site on
phosphofructokinase to inhibit enzyme.
- ADP activates this enzyme
Besides ATP, what other molecule can inhibit production of phosphofructokinase? -
Answer-Citrate
What inhibits the conversion of pyruvate to Acetyl-CoA? - Answer-Excess NADH.
Explain the process of lactate fermentation. - Answer-Glycolysis produces NADH and
pyruvate molecules that react with NADH to produce lactate. NAD+ is oxidized, allowing
glycolysis to continue.
Explain the process of ethanol fermentation - Answer-Glycolysis produces NADH and
pyruvate molecules, which get converted to Acetaldehyde. It reacts with NADH to
produce ethanol. NAD+ is reoxidized. CO2 is produced.
What is the photosynthesis equation? - Answer-6CO2 + 6 H20 + energy --> C6H12O6 +
6O2
_____ 'funnels' light energy to the reaction centre, and is made up of ______. - Answer-
antenna complex, accessory pigments
Explain the path of electrons starting from photons of light absorbed, to Photosystem II -
Answer-- photons of light is absorbed by pigment molecule
- antenna complex funnels light energy to the unique chlorophyll a molecules in the
reaction centre P680 of photo system II
1NADH yields how many ATP? What about from glycolysis? - Answer-3 ATP, otherwise
only 2 ATP from glycolysis
1 FADH2 yields how many ATP? - Answer-2 ATP
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