CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 9 - MCQExams.com

TCA cycle enzymes are located in
  • Cristae of the mitochondria.
  • Outer membrane of the mitochondria.
  • Mitochondrial matrix.
  • Mitochondrial intermembrane space.
Choose the correct combination of labeling the molecules involved in the pathway of anaerobic respiration in Yeast.
570948_5b3a31d630ce407a8086eb44f59e7208.png
  • A - Ethanol, B - $$C{ O }_{ 2 }$$, C - Acetaldehyde
  • A - $$C{ O }_{ 2 }$$, B - Ethanol, C - Acetaldehyde
  • A - Acetaldehyde, B - $$C{ O }_{ 2 }$$, C - Ethanol
  • A - Ethanol, B - Acetaldehyde, C - $$C{ O }_{ 2 }$$
Select a suitable name for this process.
$${C}_{6}{H}_{12}{O}_{6}+2ADP+2Pi \longrightarrow 2{C}_{2}{H}_{5}OH + 2ATP + 2C{O}_{2}\uparrow$$
  • Alcoholic fermentation
  • Photorespiration
  • Lactate fermentation
  • Aerobic respiration
Cellular respiration takes place in the mitochondria of eukaryotic cells. Which process is affected when holes are poked through the inner mitochondrial most membrane?
  • Production of pyruvate
  • Production of Acetyl-CoA
  • Production of NADH
  • Production of ATP
  • Production of lactic acid
Which of the following metabolites enter the TCA cycle during glucose oxidation?
  • Oxaloacetic acid
  • Pyruvic acid
  • Acetyl CoA
  • Malic acid
RQ (Respiratory Quotient) is defined as
  • $$Volume \quad of \quad C{O}_{2} \quad evolved = volume \quad of \quad {O}_{2} \quad consumed$$
  • $$\dfrac{Volume \quad of \quad {O}_{2} \quad consumed}{Volume \quad of \quad C{O}_{2} \quad evolved}$$
  • $$\dfrac{Volume \quad of \quad C{O}_{2} \quad evolved}{Volume \quad of \quad {O}_{2} \quad consumed}$$
  • $$\dfrac{Volume \quad of \quad {O}_{2} \quad evolved}{Volume \quad of \quad C{O}_{2} \quad consumed}$$
During complete oxidation of one glucose molecule, the number of ATP molecules obtained by direct substrate level phosphorylation is 
  • 2
  • 4
  • 6
  • 8
Removal of water molecule from the substrate is called
  • Enolation
  • Phosphorylation
  • Decarboxylation
  • Oxidation
Acetylation of pyruvate takes place in the 
  • $$F_1$$ particles.
  • Perimitochondrial space.
  • Mitochondrial matrix.
  • Cristae.
Column I contains some terms and column II contains their meanings. Match the properly and choose the right answer.
Column I
Column II
A. Glycogenesis
Conversion of glycogen to glucose
B. Glycosuria
Conversion of glucose to glycogen
C. Glyconeogenesis
Excretion of glucose in urine
D. Glycogenolysis
Conversion of non-carbohydrate sources to glucose

Conversion of glucose to starch
  • A- $$1$$, B-$$2$$, C-$$3$$, D-$$4$$
  • A-$$2$$, B-$$3$$, C-$$4$$, D-$$1$$
  • A-$$2$$, B-$$1$$, C-$$3$$, D-$$4$$
  • A-$$1$$, B-$$5$$, C-$$2$$, D-$$4$$
How many glucose molecules are required for the formation of 52 pyruvic acid molecules at the end of glycolysis?
  • 52
  • 46
  • 32
  • 26
Membrane bound Krebs cycle enzyme is
  • Fumarase
  • Cis-aconitase
  • Succinic dehydrogenase
  • Malate dehydrogenase
Anaerobic respiration following glycolysis is
  • Oxidative phosphorylation
  • Krebs cycle
  • Fermentation
  • Both A and B
Given below are some reactions and the enzymes involved. Identify the correct pairs.

I.

II.
$$1$$.
Fructose $$1, 6$$ diphosphate $$\rightarrow 3$$PGAL $$+$$ DHAP
a.
Enolase
$$2$$.
Citrate $$\rightarrow$$Cis - aconitate
b.
Thiokinase
$$3$$.
Succinyl Co. A $$\rightarrow$$ Succinate
c.
Aconitase
$$4$$.
$$2$$PGA$$\rightarrow$$ PEPA
d.
Aldolase
  • 1- d, 2- c, 3- b, 4- a
  • 1- a, 2- b, 3- c, 4- d
  • 1- b, 2- a, 3- d, 4- c 
  • 1- c, 2- b, 3- a, 4- b
The number of ATP molecules utilised for the breakdown of one molecule of glucose during glycolysis is
  • 62
  • 2
  • 8
  • 4
Oxalosuccinic acid, an intermediary compound of Krebs cycle is a
  • 4 carbon compound.
  • 3 carbon compound.
  • 5 carbon compound.
  • 6 carbon compound.
Enzyme enolase catalyzes the conversion of 2 PGA to phosphoenol Pyruvic acid in presence of .......... which is the cofactor.
  • $$Mn^{++}$$
  • $$Fe^{++}$$
  • $$Mg^{++}$$
  • Both A and C
In anaerobic respiration, acetaldehyde is reduced to form alcohol by utilising NADH$$_2$$ obtained from 
  • Glycolysis.
  • Terminal oxidation.
  • Krebs cycle.
  • Acetylation.
In Kreb's cycle, guanosine triphosphate is formed during the conversion of
  • Isocitrate to oxalosuccinate.
  • Oxalosuccinate to $$\alpha$$-ketoglutarate.
  • Succinyl Co-A to succinate.
  • Fumarate to malate.
The number of ATP produced when a molecule of glucose undergoes fermentation is?
  • $$4$$
  • $$36$$
  • $$2$$
  • $$38$$
When 100% carbon is oxidized to CO$$_2$$, the efficiency of such respiration is
  • 40%
  • 60%
  • 90%
  • 100%
Which is false regarding EMP pathways?
  • End product is $$CO_2$$ and $$H_2O$$
  • Substrate level phosphorylation
  • Production of ATP
  • Expenditure of ATP
In pne Krebs cycle, decarboxylation takes place at .......... steps.
  • Five
  • Four
  • Three
  • Two
Series of reactions which can convert fatty acids to sugars in plants but not in animals is
  • Krebs cycle
  • Glyoxylate cycle
  • Ornithine cycle
  • Glycolysis.
During glycolysis, glucose is first changed to
  • Glucose 6-phosphate
  • Fructose 6-phosphate
  • Glucose 1, 6-phosphate
  • Fructose 1, 6-phosphate
FAD acts as an $$e^-$$ acceptor in between
  • Fumaric and malic acid
  • Succinic and fumaric acid
  • Malic and oxaloacetic acid
  • Citric and isocitric acid
Which one of the following reactions is an example of oxidative decarboxylation?
  • Conversion of succinate to fumarate.
  • Conversion of fumarate to malate.
  • Conversion of pyruvate to acetyl Co-A.
  • Conversion of citrate to isocitrate.
TCA enzymes mostly occur in
  • Ribosomes
  • Mitochondrial matrix
  • Cytoplasm
  • Peroxisome
In members of family Crassulaceae, .......... is regenerated from starch during night.
  • Phosphoenol pyruvic acid
  • Pyruvic acid
  • Malic acid
  • Oxaloacetic acid
Common phase in aerobic and anaerobic respiration is
  • Krebs cycle.
  • Glycolysis.
  • Glycogenolysis.
  • ETS.
Which one is inhibited if the cells contain excess of ATP
  • Krebs cycle
  • Glycolysis
  • Oxidative phosphorylation
  • Electron transport
The intermediate of glycolysis which undergoes lysis or splitting is
  • Dihydroxyacetone 3 - phosphate
  • Fructose 1,6 - diphosphate
  • Glyceraldehyde 3 -phosphate
  • Glucose 6 - phosphate
Formation of phosphoenol pyruvate from 2-pliosphoglycerate is
  • Dehydration
  • Dehydrogenation
  • Oxidation
  • Hydration
Enzyme taking part in converting dihydroxyacetone phosphate to glyceraldehyde phosphate belongs to the class of
  • Isomerases
  • Hydrolases
  • Ligases
  • Transferases
Fermentation is
  • Anaerobic respiration
  • Incomplete oxidation of carbohydrates
  • Complete oxidation of carbohydrates
  • None of the above
For undergoing glycolysis, glucose requires priming with the help of how many ATP?
  • 1
  • 2
  • 3
  • 4
Which one yields the highest energy per gram
  • Carbohydrate
  • Protein
  • Fat
  • Amino acids
Respiratory formation of ATP during the reactions 1,3-diphosphoglyceric acid-->3-phosphoglyceric acid and phosphoenol pyruvate -->Pyruvate is
  • Oxidative phosphorylation
  • Substrate level phosphorylation
  • Respiratory phosphorylation
  • Chemical phosphorylation
The different steps of aerobic respiration are
  • Glycolysis and oxidative phosphorylation
  • Glycolysis and Krebs cycle
  • Glycolysis, Krebs cycle and terminal oxidation
  • Krebs cycle and terminal oxidation
Substrate phosphorylation is the formation of
  • ATP
  • AMP
  • ADP
  • Pyruvic acid
An amphibolic pathway is
  • TCA cycle
  • Calvin cycle
  • Terminal oxidation
  • Electron transport chain
A complex enzyme system functional in Krebs cycle is
  • Citrate synthetase
  • Isocitrate dehydrogenase.
  • Oxalosuccinate decarboxylase
  • $$\alpha$$-ketoglutarate dehydrogenase
Inner mitochondrial membrane allows the passage of
  • Glucose
  • Pyruvate
  • NADH
  • Oxaloacetate
The respiratory enzymes are located in
  • Mitochondrial matrix
  • Perimitochondrial space
  • Cristae
  • Outer membrane
Number of carbon atoms present in citric acid, oxaloacetic acid, and pyruvic acid are 
  • 6, 3 and 3 respectively
  • 6, 4 and 3 respectively
  • 5, 4 and 3 respectively
  • 6, 4 and 2 respectively
Number of ATP molecules synthesised through substrate level phosphorylation during aerobic respiration of one glucose molecule is
  • 8
  • 6
  • 4
  • 2
During conversion of pyruvic acid into acetyl CoA, pyruvic acid is
  • Reduced
  • Oxidised
  • Isomerised
  • Condensed
A complex enzyme system of mitochondria functional outside Krebs cycle is
  • Pyruvate kinase
  • Pyruvate dehydrogenase
  • Enolase
  • $$\alpha$$ - Ketoglutarate dehydrogenase
Tricarboxylic acids of Kreb's cycle are
  • Succinic acid, Fumaric acid and Citric acid
  • Oxalosuccinic acid, Citric acid and $$\alpha$$-ketoglutaric acid.
  • Citric acid, Isocitric acid and Malic acid
  • Citric acid, Isocitric acid and Oxalosuccinic acid
Hydration reaction occurs in Krebs cycle during conversion of
  • Acetyl CoA to citric acid
  • $$\alpha$$-ketoglutarate to succinyl CoA
  • Succinate to fumarate
  • Fumarate to malate
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