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2.8 & 8.2 Cell Respiration Questions and Answers 2024
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2.8 & 8.2 Cell Respiration
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2.8 & 8.2 Cell Respirationgeneral equation for aerobic respiration - answer Glucose + Oxygen = Carbon Dioxide +
Water (+38 ATP)
C6H12O6 + 6O2 = 6CO2 + 6H2O + 38 ATP
what is pyruvate converted into in anaerobic respiration (animal cells)? - answer lactate
What is pyruvate converted into in yeast cells? - answer ethanol and carbon dioxide
What are the three ways something can be reduced? - answer gain of electrons
gain of hydrogen
loss of oxygen
Where does glycolysis occur? - answer cytoplasm of the cell
Describe the first stage of glycolysis (what's it called?) - answer Phosphorylation!
2 ATP molecules are used to convert glucose into hexose bisphosphate
(phosphorylated 6-carbon sugar)
Second stage of glycolysis - answerLysis!
hexose bisphosphate splits into 2 triose phosphate molecules
third stage of glycolysis - answerOxidation
Triose phosphate is oxidised and 2 NAD+ are reduced to form 2 NADH + H+
last stage of glycolysis - answerATP formation
two phosphate groups from each triose bisphosphate are transferred onto two
molecules of ADP (so in total 4 ATP are produced and 2 Pyruvate)
draw + label diagram of a mitochondria - answershould have included:
cristae
fluid matrix
ribosomes
inner membrane
outer membrane
ATPase (?)
Where does the link reaction happen - answerfluid matrix of the mitochondria
Which substance is oxidised in the link reaction? - answerpyruvate (to form acetyl CoA)
, What kind of reaction is the link reaction? - answerdecarboxylation
What are the products of the link reaction? - answerCO2, acetyl CoA, NAD+ is reduced
to form NADH + H+
Where does the Krebs cycle happen? - answerFluid matrix of the mitochondria
What are the products of the link reaction and krebs cycle (per molecule of glucose) -
answer8x NADH + H+
2x FADH2
2x ATP
6x CO2
What is oxidative phosphorylation? - answerthe formation of ATP in the mitochondria
using energy released by the oxidation of glucose during respiration
Where does the electron transport chain happen? - answeracross the membranes of
the cristae (inner membrane)
What happens to the pH of the inter-membrane space as electrons move along the ETC
- answerthe pH is lowered as protons accumulate
which molecule do protons pass through going from the inter-membrane space to the
matrix? - answerATP synthase
What is NOT a product of the Krebs Cycle
A. CO2
B. NADH + H+
C. Pyruvate
D. ATP - answerC. Pyruvate
How many ATP molecules (net yield) are produced per molecule of glucose as a direct
result of
glycolysis?
A. 2
B. 4
C. 10
D. 38 - answerA. 2
Which way do the protons flow when ATP is synthesized in mitochondria?
A. From the inner matrix to the intermembrane space
B. From the intermembrane space to the inner matrix
C. From the intermembrane space to the cytoplasm
D. From the cytoplasm to the intermembrane space - answerB. From the
intermembrane space to the inner matrix
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