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Quiz 2
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Q.1
Out of 36ATP molecules produced per glucose molecule during respiration … … [ CBSE 1991]
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a) 2 are produced outside glycolysis and 34 during respiratory chain
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b) 2 are produced outside mitochondria and 34 inside mitochondria
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c) 2 during glycolysis and 34 during Krebs cycle
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d) All are formed inside mitochondria
Explanation
Glycolysis produces 2 ATP, 2 NADH, and 2 pyruvate molecules, NADH, and pyruvate, which itself enters the citric acid cycle to produce more energy. The two NADH that are produced during glycolysis pass into the mitochondria, are added into the electron transport system, and are then used in the production of ATP ATP that comes from glycolysis, and ATP that comes from the Krebs Cycle and the Electron Transport Chain Answer : (b)
Q.2
Glycolysis and TCA cycle operate respectively in … … [ CBSE 1994]
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a) Cytosol and matrix of mitochondrion
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b) Cytosol and stroma of chloroplast
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c) Cytosol and oxysomes of mitochondrion
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d) Matrix of mitochondrion and inner membrane of mitochondrion
Explanation
Glycolysis occurs in the cytosol, but the Krebs cycle and electron transport chain occur inside the mitochondria. Answer : (a)
Q.3
Mitochondrial matrix has enzyme for .. .. [ AMU 1996]
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a) Krebs cycle
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b) TCA cycle and electron transport
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c) Glycolysis and TCA cycle
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d) Both b and c
Explanation
The enzymes in the matrix facilitate reactions responsible for the production of ATP, such as the citric acid cycle (Krebs cycle, TCA cycle), oxidative phosphorylation, oxidation of pyruvate and the beta oxidation of fatty acids. Answer : (a)
Q.4
Which theory explains ATP synthesis in chloroplasts and mitochondria? … ..[ CBSE 1997]
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a) Lipman and Lohmann theory
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b) Lock and Key theory of Fischer
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c) Induced fit theory of Koshland
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d) Chemi-osmotic theory of Mitchell
Explanation
The chemiosmotic hypothesis was proposed by Peter Mitchell. This hypothesis stated that a proton-motive force was responsible for driving the synthesis of ATP. In this hypothesis, protons would be pumped across the inner mitochondrial membrane as electrons went through the electron transfer chain. Answer : (d)
Q.5
General formula for aerobic respiration is … .. [ JIPMER 1998]
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a) 6CO2 + 6H2O → C6H12O6 + 6O2
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b) C6H12O6 + 6O2 → 6CO2 + 6H2O + 686 kcal
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c) C6H12O6 → 2C2H5OH + 2CO2 + 2ATP
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d) C6H12O6 → 2C3H6O3 + 2ATP
Explanation
Answer : (b)
Q.6
Oxidative phosphorylation occurs during … ..[ Manipal 2001]
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a) Photosynthesis
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b) Protein synthesis
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c) Respiration
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d) Lipid synthesis
Explanation
Oxidative phosphorylation is the fourth step of cellular respiration, and produces the most of the energy in cellular respiration Answer : (c)
Q.7
Anaerobic respiration following glycolysis is … ..[ BHU 2006]
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a) Krebs cycle
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b) Oxidative phosphorylation
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c) Fermentation
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d) Both a and b
Explanation
The second step in anaerobic respiration is called fermentation. Fermentation starts with pyruvate (the end product of glycolysis). Depending on the organism, pyruvate can either be fermented into ethanol (a fancy name for alcohol) or lactate (lactic acid). Answer : (c)
Q.8
In respiration .. .. [ Manipal 2002]
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a) 2PGAL are formed in glycolysis and none in Krebs cycle
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b) 6 PGAL in glycolysis, 3 PGAL in Krebs cycle
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c) 8 PGAL in glycolysis, 3 PGAL in Krebs cycle
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d) PGAL formation does not occur in respiration
Explanation
In glycolysis, the six-carbon product of glucose phosporylation, called glucose-6-phosphate, ultimately breaks into 2 three-carbon molecules of PGAL. Answer : (a)
Q.9
Pasteur effect is … .. [ Wardha 2005]
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a) Stoppage of fermentation in presence of oxygen
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b) Increase of fermentation in presence of oxygen
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c) Decrease in fermentation is presence of oxygen
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d) No effect of fermentation
Explanation
Answer : (a)
Q.10
During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP .. ..[ CBSE 2005]
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a) Glycolysis
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b) Krebs cycle
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c) Conversion of pyruvic acid to acetyl CoA
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d) Electron transport chain
Explanation
In glycolysis 34 ATP from electron transport chain Answer : (d)
Q.11
There is no transfer of electron from cty b to cyt c as … … [ MHT CET 2007]
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a) Energy is not available
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b) The two are not nearby
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c) Electrons are transported in pairs
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d) Electrons have no affinity for cyto-chromes
Explanation
Cytochrome b is a protein found in the mitochondria of eukaryotic cells. cytochrome b complex functions to mediate the transfer of electrons between the two photosynthetic reaction center complexes, from Photosystem II to Photosystem I, The cytochrome complex, or cyt c is a small hemeprotein found loosely associated with the inner membrane of the mitochondrion. Cytochrome c is a component of the electron transport chain in mitochondria. Answer : (b)
Q.12
End product of citric acid/Krebs cycle is … .. [ CBSE 1993]
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a) Citric acid
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b) Lactic acid
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c) Pyruvic acid
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d) CO2 + H2O
Explanation
Answer : (d)
Q.13
Which is rich in energy .. .. [ CET Chd 2003]
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a) NAD+
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b) Mitochondria
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c) FAD
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d) ATP
Explanation
ATP, is the principal molecule for storing and transferring energy in cells. It is often referred to as the energy currency of the cell and can be compared to storing money in a bank. Answer : (d)
Q.14
Coenzyme NAD+ and FAD are connected with respiratory reaction as they … … [ Tamilnadu 2001]
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a) Are involved in each step of ATP synthesis
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b) Function in Krebs cycle and terminal oxidative phosphorylation
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c) Act as hydrogen carrier
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d) Are reducing agent
Explanation
NAD and FAD plays a major role in cellular respiration, They carry the H+ and electrons to Electron Transport Chain to convert ADP + Pi ATP. Answer : (c)
Q.15
Site of glycolysis/EMP is … .. [ JKCET 2012]
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a) Chloroplast
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b) Chromosome
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c) Cytoplasm
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d) Nucleus
Explanation
Glycolysis is the first step of aerobic respiration in all living organisms. It is an anaerobic pathway which does not require oxygen and takes place in the cytoplasm of cells Answer : (c)
Q.16
ADP → ATP → ADP system was found by Lipmann in … .. [ Pb PMT 1997]
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a) 1940
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b) 1950
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c) 1960
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d) 1970
Explanation
Between 1939 and 1941 Fritz Lipmann (USA) shows that ATP is the main bearer of chemical energy in the cell. He coins the phrase “energy-rich phosphate bonds”. Answer : (a)
Q.17
Respiration is … . [ AIIMS 1996]
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a) Catabolic process that uses carbon dioxide, produces oxygen and converts released energy to ATP
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b) Anabolic process that uses oxygen and carbon dioxide to form ATP
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c) Anabolic process that uses oxygen, produces carbon dioxide and converts released energy into ATP
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d) Catabolic process that uses oxygen, produces carbon dioxide and converts released energy into ATP
Explanation
In cellular respiration, glucose and oxygen react to form ATP. Water and carbon dioxide are released as byproducts. The three stages of aerobic cellular respiration are glycolysis (an anaerobic process), the Krebs cycle, and oxidative phosphorylation. Answer : (d)
Q.18
Life without air would be … … [ CBSE 1993]
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a) Reduction
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b) Free from oxidative damage
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c) Impossible
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d) Anaerobic
Explanation
Fermentation happens in anaerobic conditions (i.e.,without oxygen). Fermentation begins with glycolysis which breaks down glucose into two pyruvate molecules and produces two ATP (net) and two NADH. Fermentation allows glucose to be continuously broken down to make ATP due to the recycling of NADH to NAD+ Answer : (d)
Q.19
Sequence in Krebs cycle is … … [ MHTCET 2010]
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a) αKetoglutaric acid → Isocitric acid → Oxalosuccinic acid
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b) Isocitric acid → Oxalosuccinic acid → αKetoglutaric acid
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c) Isocitric acid → αKetoglutaric acid → Oxalosuccinic acid
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d) Oxalosuccinic acid → Isocitric acid → αKetoglutaric acid
Explanation
Answer : (b)
Q.20
In succulents, respiratory quotient is less than one due to … .. [ RPMT 2006]
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a) Incomplete oxidation
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b) Incomplete reduction
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c) Complete reduction
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d) Complete oxidation
Explanation
Respiratory quotient (RQ) or respiratory coefficient is a measurement of the ratio between oxygen (O2) an organism intakes and carbon dioxide (CO2) the organism eliminates, expressed with the formula RQ=CO2 eliminated/O2 absorbed. In succulent plants, the RQ is less than one in the night. This is due to to incomplete oxidation of carbohydrates which leads to production of acids such as malic acid, oxalic acid and in extreme cases, no CO2 is evolved at all. This makes the RQ less than 1. Answer : (a)
Q.21
In the process of respiration in plants 180g of glucose plus 192g of oxygen produce … ..[ AIIMS 2001]
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a) 132g of CO2, 54g of water and 343 Cal. Of energy
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b) 264g of CO2 , 108g of water and 686 Cal, of energy
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c) 528g of CO2, 216 g of water and 1372 Cal. Energy
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d) Large amount of CO2, no water and no energy
Explanation
Answer : (b)
Q.22
Most of the biological energy is supplied by mitochondria through … ..[ MPPMT 1994]
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a) Breaking of proteins
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b) Reduction of NADP+
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c) Breaking of sugar
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d) Oxidising TCA substrates
Explanation
1 mole of glucose (180 g) and oxidize it with 6 moles of oxygen molecules, there are 6 moles of carbon dioxide, 6 moles of water and 686 kcal of energy produced Answer : (d)
Q.23
Both ATP and Mg2+ are involved in the activity of … … [ AIIMS 1992]
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a) Pyruvic Kinase
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b) Glucokinase
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c) Phosphoglucoisomerase
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d) PGA dehydrogenase
Explanation
Answer : (b)
Q.24
During passage of electron over ETC … … [BHU 2012]
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a) Electron undergoes resonance
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b) Electron undergoes fluorescence
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c) Electron undergoes active transport
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d) pH of inner mitochondrial membrane increases
Explanation
Energy obtained through the transfer of electrons down the ETC is used to pump protons from the mitochondrial matrix into the intermembrane space, creating an electrochemical proton gradient (ΔpH) across the inner mitochondrial membrane (IMM). Answer : (d)
Q.25
ATP molecules formed on complete oxidation of 40 moles of glucose … ..[ WB 2012]
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a) 3040
0%
b) 380
0%
c) 190
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d) 1520
Explanation
Answer : (d)
Q.26
In citric acid cycle, the step not using dehydrogenase enzymes is .. ..[ AMU 2011]
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a) Malic acid to oxaloacetate
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b) Succinate to fumarate
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c) Oxaloacetate to citric acid
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d) Citric acid to α-ketoglutarate
Explanation
Answer : (c)
Q.27
In Krebs cycle., OAA accepts acetyl CoA to form … .. [ Odisha 2010]
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a) Citric acid
0%
b) Oxalosuccinate
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c) Fumarate
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d) Succinyl CoA
Explanation
Answer : (a)
Q.28
Conversion of pyruvic acid to acetyl CoA is … ..[ AFMC 2009]
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a) Reductive carboxylation
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b) Oxidative decarboxylation
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c) Oxidative carboxylation
0%
d) Reductive decarboxylation
Explanation
Answer : (b)
Q.29
Which enzyme converts glucose into alcohol .. ..[ CPMT 2008]
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a) Invertase
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b) Lipase
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c) Zymase
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d) Diastase
Explanation
Answer : (c)
Q.30
lyceraldehyde phosphate is oxidized in glycolysis. What is fate of hydrogen atom and electron liberated. They cause …
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a) Oxidation of NAD+
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b) Reduction of NAD+
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c) Change in oxaloacetic acid
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d) Formation of methane
Explanation
Answer : (b)
0 h : 0 m : 1 s
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