Respiration Mark Scheme for 2024 Midterm
Questions with Answers
Describe the role of NAD in respiration. - Correct Answer NAD NADH in link reaction;3
places where NAD NADH in Krebs cycle; FADFADH in Krebs cycle;
Describe the role of NAD in respiration. - Correct Answer mammals
pyruvate is, reduced / converted, to lactate;NAD red is oxidised;one step reaction /
catalyzed by lactate dehydrogenase;
yeast
pyruvate is decarboxylated;CO2 is produced;ethanal;reduced / converted, to ethanol;
State the metabolic pathway that has pyruvate as an end product. - Correct Answer
glycolysis
State where the reduced NAD and reduce FAD molecules are deoxidized and describe
what happens to the hydrogen atoms - Correct Answer Inner mitochondrial membrane
NADH dehydrogenase
Hydrogen splits into protein and electrons
Electron transport chain
Energy released from electron
Proton pumped across membrane
Proton accumulate in inter membrane spaces
Proton gradient
Proton pass through ATP syntheses
Oxygen final electron acceptor
Formation of water
Explain why build of fat occur in the liver of an individual who's consumes large amount
of alcohol - Correct Answer Fatty acid not respires
NAD is used in breakdown of alcohol
NAD is limiting
FATs formed from fatty acid plus glycerol
Describe the role and fate of reduced NAD in respiring yeast cells both in presence and
absence of oxygen - Correct Answer Enters mitochondrion
Shuttle system
Go to inner mitochondria membrane
NADH dehydrogenase
Hydrogen splits into protein and electrons
Electron go to ETC
, protons to intermembrane space
What is entering the Mitochondria from cytoplasm - Correct Answer Oxygen
Pyruvate
ADP
Phosphate
Fatty acid
Amino acid
What is leaving mitochondria and enter the cytoplasm - Correct Answer Carbon
dioxide
NAD
ATP
WATER
explain why fatty acid release more energy per gram than carbohydrates - Correct
Answer More C-H bonds
More reduced hydrogen carriers
More turns in Krebs cycle
Stepper proton gradient
More oxidative phosphorylation
Describe the similarities between mechanisms of photosphorlation and oxidative
phosphorylation - Correct Answer Use of electron transport system
Release energy
Move hydrogen pump
Across membrane
Proton gradient
ATP synthase
Chemiosmosis
EXPALIN how ATP enables nerve cells to transmit impulses - Correct Answer Sodium
and potassium pump
Potassium ion and sodium ions out
3 sodium ions and 3 potassium like
Helps to main energy
Explain why the apparatus is left for 10 min before reading are taken - Correct Answer
To equilibrate
Explain the purpose of the second respiriometer - Correct Answer Control test
Due temperature and pressure
To show only maggots respire
Explain the controlled values - Correct Answer Volume
Mass of maggots
Questions with Answers
Describe the role of NAD in respiration. - Correct Answer NAD NADH in link reaction;3
places where NAD NADH in Krebs cycle; FADFADH in Krebs cycle;
Describe the role of NAD in respiration. - Correct Answer mammals
pyruvate is, reduced / converted, to lactate;NAD red is oxidised;one step reaction /
catalyzed by lactate dehydrogenase;
yeast
pyruvate is decarboxylated;CO2 is produced;ethanal;reduced / converted, to ethanol;
State the metabolic pathway that has pyruvate as an end product. - Correct Answer
glycolysis
State where the reduced NAD and reduce FAD molecules are deoxidized and describe
what happens to the hydrogen atoms - Correct Answer Inner mitochondrial membrane
NADH dehydrogenase
Hydrogen splits into protein and electrons
Electron transport chain
Energy released from electron
Proton pumped across membrane
Proton accumulate in inter membrane spaces
Proton gradient
Proton pass through ATP syntheses
Oxygen final electron acceptor
Formation of water
Explain why build of fat occur in the liver of an individual who's consumes large amount
of alcohol - Correct Answer Fatty acid not respires
NAD is used in breakdown of alcohol
NAD is limiting
FATs formed from fatty acid plus glycerol
Describe the role and fate of reduced NAD in respiring yeast cells both in presence and
absence of oxygen - Correct Answer Enters mitochondrion
Shuttle system
Go to inner mitochondria membrane
NADH dehydrogenase
Hydrogen splits into protein and electrons
Electron go to ETC
, protons to intermembrane space
What is entering the Mitochondria from cytoplasm - Correct Answer Oxygen
Pyruvate
ADP
Phosphate
Fatty acid
Amino acid
What is leaving mitochondria and enter the cytoplasm - Correct Answer Carbon
dioxide
NAD
ATP
WATER
explain why fatty acid release more energy per gram than carbohydrates - Correct
Answer More C-H bonds
More reduced hydrogen carriers
More turns in Krebs cycle
Stepper proton gradient
More oxidative phosphorylation
Describe the similarities between mechanisms of photosphorlation and oxidative
phosphorylation - Correct Answer Use of electron transport system
Release energy
Move hydrogen pump
Across membrane
Proton gradient
ATP synthase
Chemiosmosis
EXPALIN how ATP enables nerve cells to transmit impulses - Correct Answer Sodium
and potassium pump
Potassium ion and sodium ions out
3 sodium ions and 3 potassium like
Helps to main energy
Explain why the apparatus is left for 10 min before reading are taken - Correct Answer
To equilibrate
Explain the purpose of the second respiriometer - Correct Answer Control test
Due temperature and pressure
To show only maggots respire
Explain the controlled values - Correct Answer Volume
Mass of maggots
