For the substrate Glucose, how many Oxygen are used and how many Carbon-dioxide are evolved?

  • 3,3

  • 6,3

  • 3,6

  • 6,6

Tripalmitin

Which of the following is wrong?

  • A fatty acid

  • C51 H98 O6

  • C48 H96 O5

  • Both A and C

Aerobic Respiration:

  • More common in higher organisms

  • Leads to complete oxidation of Organic substance in the presence of oxygen and release of Carbon-dioxide

  • Large amount of energy present in substrate and amount of water is also released out

  • All of these

Respiratory Quotient

  • Some Ratio

  • Some amount of oxygen

  • Some amount of carbon dioxide

  • Cannot be one

Respiratory Quotient is

  • Volume of Carbon-dioxide evolved

  • Ratio of volume of oxygen consumed to volume of Carbon-dioxide evolved

  • Ratio of volume of Carbon-dioxide evolved to the volume of oxygen consumed

  • Ratio of volume of oxygen evolved to volume of Carbon-dioxide consumed

The value of respiratory Quotient actually depends upon

  • The type of respiratory substrate used

  • The place in which respiration is occurring

  • The amount of ventilation

  • Breathing surface

During prolonged fasting, in what sequence are the following organic compounds used up by the body ?

  • First carbohydrates, next proteins and lastly lipids

  • First proteins, next lipids and lastly carbohydrates

  • First carbohydrates, next fats and lastly proteins

  • First fats, next carbohydrates and lastly proteins

At which step, glycolysis reaches the break-even point: 2
molecules of ATP consumed, and 2 new molecules synthesized ?

  • Splitting of fructose-6-phosphate to two trioses

  • Conversion of 1,3 bi-phosphoglycerate to 3 phosphoglycerate
  • Coversion of GADP to 1,3 biphosphoglycerate
  • Conversion of DHAP to GADP

Under which condition would you expect the mitochondrial proton gradient to be highest and therefore ATP synthesis to proceed?

  • pyruvate (present)-oxygen (present)-ATP levels (high)
  •  pyruvate (present)-oxygen (present)-ATP levels (low)
  •  pyruvate (present)-oxygen (absent)-ATP levels (high)
  •  pyruvate (absent)-oxygen (present)-ATP levels (low)

Plants can get along without respiratory organs because of all the following except:

  • Plants do not present great demands for gas exchange.
  • Gas diffusion in plants occurs easily over long distances in plants
  • Each plant part takes care of its own gas exchange needs
  • Each living cell in a plant is located quite close to the surface of plant

Sucrose is converted into glucose and fructose by the enzyme:

 

  • Maltase

  • Zymase
  • Isomerase
  • Invertase

The co-factor required for the activity of pyruvate dehydrogenase is:

  • Zinc
  • Magnesium
  • Manganese
  • Copper

In the mitochondrial electron transport system, the term Complex III refers to:

  • NADH dehydrogenase
  • Cytochrome c
  • FADH2
  • Cytochrome bc1 complex

For each ATP produced, how many H passes through F0 from the intermembrane space to the matrix down the electrochemical proton gradient?

  • 1

  • 2
  • 3
  • 4

If fatty acids were to be respired, they would first be degraded to:

  • Glucose-6 phosphate
  • Pyruvate
  • Acetyl-CoA
  • Alpha ketoglutarate

In the absence of oxygen, the primary purpose of fermentation is to:

  • produce amino acids for protein synthesis
  • generate a proton gradient for ATP synthesis
  • oxidize glucose to generate reduce electron carriers
  • regenerate NAD+ from NADH allowing glycolysis to continue

During glycolysis, when glucose is catabolized to pyruvate, most of the energy of glucose is 

  • transferred to ADP, forming ATP.
  • transferred directly to ATP.
  • retained in the pyruvate.
  • stored in the NADH produced.

ATP production during cellular respiration is controlled by allosteric inhibition. The control is the allosteric inhibition by ATP and citric acid of the enzyme that facilitates the formation of:

  • Glucose 6- phosphate from glucose

  • Fructose 1,6- bisphosphate from Fructose 6 - phosphate
  • Acetyl CoA from Pyruvic acid
  • Citric acid from Acetyl CoA and Oxaloacetic acid

When proteins are used as respiratory substrates, the respiratory quotient would be about:

  • 1.2
  • 1.0
  • 0.9
  • 0.7

The mitochondrial electron transport chain is located in:

  • Outer membrane
  • Inner membrane
  • Inter membrane space
  • Matrix

The useful purpose served by lactate fermentation is:

  • Make lactose available for gluconeogenesis
  •  Production of additional ATP in anaerobic conditions
  • Regeneration of NAD+
  • Increased availability of oxygen for the skeletal muscle

The primary role of oxygen in cellular respiration is to:

  • yield energy in the form of ATP as it is passed down the respiratory chain.

  • act as an acceptor for electrons and hydrogen, forming water
  • combine with carbon, forming CO2.
  • combine with lactate, forming pyruvate.

Which of the following processes makes direct use of oxygen?

  • Glycolysis
  • Fermentation
  • Kreb's citric acid cycle
  • Electron transport

Which statement is wrong for Krebs' cycle?

  • There are three points in the cycle where NAD+ is reduced to NADH + H+

  • There is one point in the cycle where FAD+ is reduced to FADH2
  • During conversion of succinyl Co-A to succinic acid, a molecule of GTP is synthesised
  • The cycle starts with condensation of acetyl group (acetyl Co-A) with pyruvic acid to yield citric acid

Oxidative phosphorylation is

  • formation of ATP by transfer of phosphate group from a substrate to ADP

  • oxidation of phosphate group in ATP

  • (c) addition of phosphate group to ATP

  • formation of ATP by energy release from electrons removed during substrate oxidation. 

In which one of the following processes CO2 is not released?

  • Aerobic respiration in plants

  • Aerobic respiration in animals

  • Alcoholic fermentation

  • Lactate fermentation

The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

  • glycolysis

  • fermentation

  • aerobic respiration

  • photorespiration

Aerobic respiratory pathway is appropriately termed 

  • catabolic 

  • parabolic 

  • amphibolic 

  • anabolic 

Which one of the following mammalian cells is not capable of metabolising glucose to

carbon-dioxide aerobically?

  • White blood cells

  • Unstriated muscle cells

  • Liver cells

  • Red blood cells

All enzymes of TCA cycle are located in the mitochondrial matrix except one which is

located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes.

This enzyme is

  • lactate dehydrogenase

  • isocitrate dehydrogenase

  • malate dehydrogenase

  • succinate dehydrogenase

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