CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 4 - MCQExams.com

Four respiratory enzymes are given below.Arrange them in increasing order of the carbon number of the substrate on which they act.
(I)Enolase         (II)Aconitase
(III)Fumerase      (IV)Alcohol dehydrogenase

  • II,IV,III,I
  • IV,I,II,III
  • I,IV,III,II
  • IV,I,III,II
In carbon dioxide reduction, ATP is
  • Used
  • Unused
  • May be used or not used
  • None of the above
Which of the following is involved in the catalysis of link reaction during aerobic respiration?
  • Vitamin A
  • Vitamin $$B_{1}$$
  • Vitamin $$B_{6}$$
  • Vitamin K
Aerobic respiratory pathway is appropriately termed
  • Catabolic
  • Parabolic
  • Amphibolic
  • Anabolic
Select the wrong statement.
  • When tripalmitin is used as a substance in respiration the R.Q.is 0.7
  • The intermediate compound which links glycolysis with Kreb's cycle is malic acid
  • One glucose molecules yields a net gain of 36 to 38 ATP molecules during aerobic respiration
  • One glucose molecules yields a net gain of 2 ATP molecules  fermentation
  • The scheme of glycolysis was given by Embden,Meyerhof and Parnas
Which one is a product of aerobic respiration?
  • Malic acid
  • Ethyl alcohol
  • Lactic acid
  • Phosphoglyceric acid
Which of the following is the first step of glycolysis?
  • Breakdown of glucose
  • Phosphorylation of glucose
  • Conversion of glucose into fructose
  • Dehydrogenation of glucose
Which of the following is utilized first in respiration?
  • Fat
  • Protein
  • Sucrose
  • Hexose
Which of the following forms the connecting link between glycolysis and Kreb's cycle?
  • Glucose
  • Ethyl alcohol
  • Lactic acid
  • Pyruvic acid
Degradation of sugar and fat to Acetyl CoA will not take place if this organelle is not present in a eukaryotic cell. Which organelle is that?
  • Golgi apparatus
  • Mitochondria
  • Ribosome
  • Nucleus
In mitochondria, cristae act as a site for
  • Protein synthesis
  • Oxidation-reduction reaction
  • Breakdown of macromolecules
  • Phosphorylation of flavoproteins
The product formed by malic acid dehydrogenase is 
  • Malic acid
  • Fumaric acid
  • Oxaloacetic acid
  • Succinic acid
Hydrogen of malate is accepted by  
  • FAD
  • FMN
  • COQ
  • NAD
During Krebs cycle, energy from glucose is mostly transferred to 
  • NADH and FADH
  • NADPH
  • ADP
  • Water
The details of tricarboxylic acid pathway was worked out by
  • Miescher
  • Hans Krebs
  • Pasteur
  • None of the above
How many carbon atoms are present in citric acid?
  • 8
  • 6
  • 10
  • 2
In how many steps, $$CO_{2}$$ is released in aerobic respiration of pyruvic acid?
  • One
  • Six
  • Three
  • Twelve
 Link between glycolysis, Krebs cycle and beta-oxidation of fatty acid is
  • Pyruvic acid
  • Acetyl CoA
  • Acetaldehyde
  • Citric acid
The process by which the energy of glucose is released under aerobic respiration was discovered by
  • Hopkins
  • Lister
  • Krebs
  • Pasteur
All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in the cytosol in prokaryotes. This enzyme is 
  • Lactate dehydrogenase
  • Isocitrate dehydrogenase
  • Malate dehydrogenase
  • Succinate dehydrogenase
Connecting link between glycoysis and Krebs cycle is 
  • Citric acid
  • Acetyl CoA
  • Succinic acid
  • Oxaloacetic acid
Which intermediate compound is involved in the synthesis of amino acids?
  • Malic acid
  • Citric acid
  • $$\alpha -$$ketoglutaric acid
  • Isocitric acid
During one Krebs cycle, number of $$CO_{2}$$ molecules released are
  • 1
  • 2
  • 3
  • 4
Complete oxidation of 1 gm of glucose molecule gives rise to 
  • 68,60,000 cal
  • 6,86,000 cal
  • 68,600 cal
  • 6,800 cal
In citric acid cycle decarboxylation occurs when 
  • Citric acid converts to $$\alpha -$$ketoglutaric acid
  • Succinic acid converts to malic acid
  • Malic acid converts to oxaloacetic acid
  • Oxaloacetic acid converts to citric acid
Most of the energy in the cell is liberated by oxidation of carbohydrate when 
  • Pyruvic acid is converted into $$CO_{2}$$ and $$H_{2}O$$.
  • Pyruvic acid is converted into acetyl CoA.
  • Sugar is converted into pyruvic acid.
  • Glucose is converted into alcohol and $$CO_{2}$$.
In Krebs cycle formation of 
  • 34 ATP takes place
  • 38 ATP takes place
  • 15 ATP from each acetyl-CoA takes place
  • 12 ATP from each acetyl-CoA takes place
The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of 
  • ATP in small stepwise reactions
  • ATP in one large oxidation reaction
  • Sugars
  • Nucleic acid
Which of the following is correct sequence in Krebs cycle?
  • Isocitric acid$$\rightarrow $$Oxalosuccinic acid$$\rightarrow $$ $$\alpha $$-ketoglutaric acid
  • Oxalosuccinic acid $$\rightarrow $$Isocitric acid$$\rightarrow $$ $$\alpha $$-ketoglutaric acid
  • $$\alpha$$ -ketoglutaric acid $$\rightarrow $$Isocitric acid$$\rightarrow $$Oxalosuccinic acid
  • Isocitric acid$$\rightarrow $$ $$\alpha$$ -ketoglutatric acid $$\rightarrow $$ Oxalosuccinic acid
Mineral activator needed for the enzyme aconitase of Kreb's cycle is 
  • Cu
  • Mn
  • Fe
  • Mg
In respiration, pyruvic acid is 
  • Formed only when oxygen is available
  • One of the product of Krebs cycle
  • Broken down into two carbon fragments and $$CO_{2}$$
  • None of the above
In Krebs cycle, the Hydrogen atoms removed at succinate level are accepted by
  • FAD
  • ADP
  • ATP
  • NAD
ATP synthesis occurs on the 
  • Outer membrane of mitochondrion
  • Inner membrane of mitochondrion
  • Matrix
  • None of the above
The reaction of Krebs cycle take place
  • In cytoplasm
  • In endoplasmic reticulum
  • In matrix of mitochondria
  • On the surface of mitochondrion
Largest amount of phosphate bound energy is produced in the process of respiration during 
  • Anaerobic respiration
  • Glycolysis
  • Krebs cycle
  • Link reaction
Match the column and choose the appropriate match.
  List I  List II
 A 4C Compound 1 Acetyl Co-A
 B 2C Compound 2 Pyruvate
 C 5C Compound 3 Citric acid
 D 3C Compound 4 $$\alpha -$$keto glutaric acid
   5 Malic acid
  • A- 5, B- 1, C- 4, D- 2
  • A - 5, B- 4, C- 1, D- 2
  • A- 1, B- 5, C- 4, D- 2
  • A- 5, B- 1, C- 2, D- 4
Krebs cycle starts with the formation of six carbon compound by reaction between
  • Malic acid and acetyl CoA
  • Succinic acid and pyruvic acid
  • Fumaric acid and pyruvic acid
  • Acetyl CoA and oxaloacetic acid
The cycle in which pyruvic acid is broken down in the presence of oxygen is known as 
  • Glycolysis
  • Kreb's cycle
  • Anaerobic respiration
  • None of the above
Which one is not correct about Krebs cycle?
  • It is also called citric acid cycle.
  • The intermediate compound which links glycolysis with Krebs cycle is malic acid.
  • It occurs in mitochondria.
  • It start with six carbon compound.
Krebs cycle involves the 
  • Formation of lactic acid from glucose.
  • Change of pyruvic acid to energy transformation.
  • Formation of pyruvic acid from glucose.
  • Formation of ATP from ADP.
Oxidation of succinate to fumarate in the Kreb's cycle is due to 
  • Loss of electron from it
  • Removal of hydrogen from it
  • Addition of oxygen to it
  • None of the above
Krebs cycle is also known as
  • TCA cycle
  • Citric acid cycle
  • Tricarboxylic cycle
  • All of the above
The importance of Krebs cycle is in the production of 
  • Acetyl Co-A
  • Water
  • ATP
  • ADP
How many ATP molecules could maximally be generated from one molecule of glucose if the complete oxidation of one mole of glucose to $$CO_{2}$$ and $$H_{2}O$$ yields 686 kcal and the useful chemical energy available in the high energy phosphate bonds of one mole of ATP is 12 kcal?
  • Fifty-seven
  • One
  • Two
  • Thirty
Minerals activator needed for the enzyme carboxylase of TCA cycle is 
  • $$Mg^{++}$$ 
  • $$Fe^{+++}$$
  • $$Mo^{++}$$
  • $$Ca^{++}$$
The full form of NAD is 
  • Nicotine adenosine diphosphate
  • Nicotinamide adenosine dinucleotide
  • Nicotinamide adenine dinucleotide
  • Nicotinamide adenine diphosphate
Which of the following is not an intermediate of Krebs cycle?
  • Acetyl CoA
  • Citric acid
  • Succinic acid
  • Lactic acid
In Kreb's cycle, OAA accepts acetyl CoA to form 
  • Citric acid
  • Oxalosuccinate
  • Fumarate
  • Succinyl CoA
Activity of succinic dehydrogenase involves which of the following in TCA cycle?
  • NAD
  • FAD
  • GDP
  • ATP
In which one of the following, the two names refer to one and the same thing?
  • Tricarboxylic acid cycle and urea cycle
  • Krebs cycle and Calvin cycle
  • Tricarboxylic acid cycle and citric acid cycle
  • Citric acid cycle and Calvin cycle
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