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CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 12 - MCQExams.com
CBSE
Class 11 Medical Biology
Respiration In Plants
Quiz 12
Decarboxylation occurs during
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0%
Glycolysis.
0%
ETS.
0%
Krebs cycle.
0%
All the above.
Explanation
In Krebs Cycle six carbon compounds like Citric acid converts into Oxalo succinic acid which is five carbon compound and it forms Malic acid which further reacts and forms Oxaloacetic acid which is both four carbon compound. Therefore in each stem carbon is released in the form of carbon dioxide and the process is known as decarboxylation.
So the correct option is 'Krebs cycle.'.
In alcoholic fermentation, two molecules of glucose produce ethanol and CO$$_2$$ respectively
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2 + 2
0%
3 + 3
0%
4 + 4
0%
6 + 6
Explanation
Alcoholic respiration is done by the yeast in which two molecules of ATP, carbon dioxide and alcohol is released and the process takes place in the absence of oxygen.
$$C_6H_{12}O_6 + 2ADP\rightarrow Pi 2C_2H_5OH + CO_2 + 2ATP$$
If 2 ATP and $$C_2$$ is released by molecule. So two glucose will release 4 ATP and $ $$CO_2$$.
So the correct option is '4 + 4'.
Turns of Krebs cycle required for complete oxidation of one molecule of glucose are
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0%
2
0%
3
0%
4
0%
6
Explanation
Complete oxidation of glucose molecules requires glycolysis, Krebs cycle and electron transport chain. Two molecules of pyruvic acid are produced at the end of glycolysis. Each molecule of pyruvate is then converted to acetyl CoA before entering the Krebs cycle. Hence, for two molecules of pyruvate, two turns of Krebs cycle is required. Hence, for complete oxidation of one molecule of glucose 2 turns of Krebs cycle are required.
Thus, the correct answer is '2.'
Which one is amphibolic?
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Glycolysis.
0%
ETC.
0%
Gluconeogenesis.
0%
Krebs cycle.
Explanation
The amphibolic pathway involves both catabolic and anabolic reactions and Kreb's cycle is its good example as it degrades acetyl coenzyme to yield carbon dioxide and energy is released in the form of NADH, FADH or it can be said that it is the catabolic pathway for carbohydrates and anabolic precursor of amino acids.
So the correct option is 'Krebs cycle'.
When one molecule of glucose undergoes glycolysis aerobically, last stable product will be
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0%
One pyruvic acid
0%
Two pyruvic acid
0%
Three pyruvic acid
0%
Four pyruvic acid
Explanation
The term glycolysis has originated from the Greek words, glucose for sugar and lysis for splitting. In this process, glucose undergoes partial oxidation to form two molecules of pyruvic acid in a multi-step process catalyzed by various enzymes.
So the correct option is 'Two pyruvic'.
Oxidative decarboxylation occurs during formation of
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0%
Citric acid and succinic acid
0%
Citric acid and oxaloacetic acid
0%
Acetyl CoA and succinyl CoA
0%
Oxaloacetic acid and oxalosuccinic acid
Explanation
Oxidative decarboxylation is a type of reaction in which there is oxidation of the substrate along with release of CO$$_2$$. During the process of cellular respiration, when the pyruvic acid gets converted to acetyl CoA, oxidation occurs and CO$$_2$$ is released. Same kind of a reaction occurs in Krebs' cycle when ketoglutarate is converted to succinyl CoA.
So the answer is 'Acetyl CoA and succinyl CoA'.
Arrows in the three pathways in aerobic respiration represent net reactants or products. What do 4, 8 and 12 represent?
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FAD or $$FADH_2$$
0%
NADH
0%
ATP
0%
$$H_2O$$
TCA cycle is named after
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0%
Embden
0%
Emerson
0%
Krebs
0%
Calvin
Explanation
TCA is also known as Kreb's cycle has been named after the German biochemist Sir Hans Krebs in the year 1937 and got Nobel Prize for the same in year 1953.
So, the correct option is 'Krebs'.
Which stages of aerobic respiration take place in matrix of mitochondria
i) Oxidative decarboxylation of pyruvic acid
ii) Glycolysis
iii) Krebs cycle
iv) Oxidative phosphorylation
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0%
i and ii only
0%
ii and iii only
0%
iii and iv only
0%
i and iii only
0%
i and iv only
Explanation
After the process of glycolysis that occurs in cytoplasm, pyruvic acid thus formed enters mitochondria where it undergoes oxidative decarboxylation in the link reaction. Krebs' cycle also occurs in mitochondrial matrix.
So the answer is 'i and iii only'.
Which is true of glycolysis
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In aerobic organisms, it is the only process in respiration
0%
In this process glucose undergoes complete oxidation to form pyruvic acid
0%
Enzyme hexokinase catalyses phosphorylation of glucose to glucose 6-phosphate
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ATP is utilised in conversion of PEP to pyruvic acid
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NADH + $$H^+$$ is formed when 1, 3-biphosphoglyceric acid is converted to 3-phosphoglyceric acid
Explanation
Glycolysis is the first step in cellular respiration in which glucose is oxidised to form pyruvic acid, a 3 carbon compound which then enters Krebs' cycle for further oxidation. The first step in glycolysis causes phosphorylation of glucose on its 6th carbon, forming glucose 6-phosphate. The reaction is catalysed by enzyme hexokinase.
So the answer is 'Enzyme hexokinase catalyses phosphorylation of glucose to glucose 6-phosphate'.
How many six carbon organic acids occur in TCA cycle?
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1
0%
3
0%
2
0%
4
Explanation
TCA cycle starts with the condensation of acetyl group with oxaloacetic acid and water to yield citric acid. It contains 4 six carbon compounds. These are citric acid, cis-aconitic acid, isocitric acid and oxalo-succinic acid.
So the correct option is '4'.
Select suitable name for the process
C$$_6$$H$$_{12}$$O$$_6$$ + 2ADP + Pi 2C$$_2$$H$$_5$$OH + CO$$_2$$ + 2ATP
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Photorespiration.
0%
Lactate fermentation.
0%
Aerobic respiration.
0%
Alcoholic fermentation.
Explanation
The given process is alcoholic respiration and is done by the yeast in which two molecules of ATP, carbon dioxide and alcohol is released and the process takes place in the absence of oxygen.
So the correct option is 'Alcoholic fermentation.'
During EMP pathway, ATP is produced through
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Oxidative phosphorylation
0%
Cyclic phosphorylation
0%
Substrate phosphorylation
0%
None of the above
Explanation
During the EMP pathway or glycolysis, there is a stepwise oxidation as well as dephosphorylation of organic substrate to produce energy. A net of 2 ATP are directly produced by substrate level phosphorylation.
So, the correct answer is 'Substrate phosphorylation'.
In which one of following reactions of glycolysis, oxidation takes place
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Glucose 6-P to fructose 6-P
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Fructose 6-P to fructose 1, 6-biphosphate
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1, 3-biphosphoglycerate to 3-phosphoglyceric acid
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3-phosphoglyceraldehyde to 1, 3-biphosphoglycerate
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2-phosphoglycerate to phosphoenolpyruvate
Explanation
Oxidation of organic substrate occurs in glycolysis for the release of energy. In this, oxidation is in the form of release of hydrogen which reduces NAD to NADH2. Conversion of 3-phosphoglyceraldehyde to 1,3- biphosphoglycerate is an oxidation reaction.
So the answer is '
3-phosphoglyceraldehyde to 1,3- biphosphoglycerate'.
The inner membrane of mitochondria is permeable to
Report Question
0%
Glucose
0%
Fructose
0%
Sucrose
0%
ATP
Explanation
Mitochondria is a double membrane-bound(outer membrane and inner membrane) cell organelle found in the cytoplasm of eukaryotic cells.
Mitochondria are responsible for the conversion of nutrients into energy-yielding molecule ATP to fuel cell activities. Mitochondria is frequently referred to as powerhouse of the cell.
The inner membrane is loaded with proteins involved in electron transport and ATP synthesis. This membrane surrounds the mitochondrial matrix, where the citric acid cycle produces the electrons that travel from one protein complex to the next in the inner membrane. Hence it is permeable to ATP.
So, the correct answer is 'ATP'.
In which of the following steps of citric acid cycle,
$$
CO_2$$ is evolved
I. Citric acid -ketoglutaric acid
II. Succinic acid malic acid
III. Malic acid oxaloacetic acid
IV. -Ketaglutaric acid succinyl CoA
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0%
I and II
0%
I and IV
0%
II and III
0%
II and IV
0%
III and IV
What does the following equation represent?
$$C_6H_{12}O_6 + 2 NAD + 2 ADP + 2 Pi \rightarrow 2CH_3.CO.COOH + 2 NADH_2 + 2 ATP$$
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Incomplete glycolysis
0%
Complete glycolysis
0%
Complete aerobic respiration
0%
Complete anaerobic respiration
0%
Complete fermentation
Conversion of pyruvic acid into ethyl alcohol is facilitated by enzyme(s)
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Carboxylase
0%
Phosphatase
0%
Dehydrogenase
0%
Decarboxylase and dehydrogenase
Explanation
When the pyruvic acid converts into alcohol in the presence of enzymes by bacteria and also exhibited by some in the lack of oxygen.
$$2CH_3COOH\rightarrow2CH_3CHO+2CO_2$$ is takes place in the presence of decarboxylase which removes carbon dioxide
$$2CH_3CHO+2 NADH_2\rightarrow2C_2H_5OH+2NAD$$ is takes place in the presence of alcohol dehydrogenase.
So the correct option is '
Decarboxylase and dehydrogenase'.
Which molecule links glycolysis with fermentation as well as TCA cycle?
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Ethanol
0%
Acetaldehyde
0%
PEP
0%
Pyruvic acid.
Explanation
Glycolysis is the formation of pyruvic acid from glucose in a multi-step process in the presence of enzymes. Pyruvic acid acts as the common molecule which undergoes Krebs cycle in aerobic respiration and fermentation in anaerobic respiration.
So the correct option is 'Pyruvic acid'.
Which of the two statements together support that respiratory pathway is an amphibolic pathway.
i) Fats breakdown to glycerol and fatty acids, subsequently yields acetyl CoA
ii) In respiration C-C bonds of complex compounds breakdown through oxidation leading to release of energy
iii) Acetyl CoA from respiratory pathway is withdrawn for synthesis of fatty acids
iv) Proteins are degraded by protease to amino acids and enter the respiratory pathway
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0%
i, ii
0%
i, iv
0%
ii, iv
0%
ii, iii
Out of 38 molecules of ATP produced after aerobic respiration of glucose, the break up in ATP production in glycolysis (P). pyruvic acid to acetyl CoA formation (Q) and Krebs cycle (R) is
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P = 2, Q = 6, R = 30
0%
P = 8, Q = 6, R = 24
0%
P = 8, Q = 10, R = 20
0%
P = 2, Q = 12, R = 24
Three major ways for metabolism of pyruvic acid produced in glycolysis are
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Lactic acid fermentation, alcoholic fermentation and aerobic respiration.
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Oxaloacetic acid fermentation, lactic acid fermentation, aerobic fermentation.
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Alcoholic fermentation, oxaloacetic acid fermentation, citric acid fermentation.
0%
Citric acid fermentation, lactic acid fermentation, alcoholic fermentation.
Explanation
Glycolysis the common pathway of lactic acid fermentation, alcoholic fermentation and aerobic respiration in which glucose is converted into pyruvic acid in a multi-step reaction which includes ten major steps involve various enzymes.
So the correct option is 'Lactic acid fermentation, alcoholic fermentation and aerobic respiration.'
The coenzyme involved in oxidative decarboxylation is phosphate
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Thiamine pyrophosphate
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Biotin
0%
NAD
0%
Pyridoxal phosphate
Explanation
The oxidative decarboxylation occurs when pyruvic acid undergoes a link reaction which connects glycolysis and Krebs' cycle. Coenzymes like thiamine pyrophosphate, lipoic acid and and FAD take part in this reaction.
So, the correct answer is 'Thiamine pyrophosphate'.
How many glucose molecules are required for the formation of 52 pyruvic acid molecules at the end of glycolysis
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52
0%
46
0%
32
0%
26
Explanation
1 molecule of 6-carbon glucose forms 2 molecules of 3-carbon pyruvic acids when it undergoes glycolysis. So to form 52 pyruvic acids, 26 glucose molecules are required.
So the answer is '26'.
Some desert beetles can survive on metabolic water without ever drinking liquid water which
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0%
Was produced as water in the organisms they eat
0%
Is a breakdown product of pyruvate inside the mitochondria alongwith $$CO_2$$
0%
Is a breakdown product from glycolysis in the cytoplasm
0%
Is absorbed from the air along with respiratory oxygen
In anaerobic respiration, acetaldehyde is reduced to form alcohol by utilising $$NADH_2$$ obtained from
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0%
Glycolysis
0%
Terminal oxidation
0%
Krebs cycle
0%
Acetylation
Explanation
Anaerobic respiration starts with the process of glycolysis. The NADH2 thus formed from glycolysis are used to further oxidise acetaldehyde to form alcohol and CO2. The NAD formed are then recycled back to be used in glycolysis.
So the answer is 'Glycolysis'.
Compensation point is the value of a factor where there is
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0%
Beginning of photosynthesis
0%
Little photosynthesis
0%
Photosynthesis equal to rate of respiration
0%
Neither photosynthesis nor respiration
Explanation
Compensation point is the value of a factor where the rate of photosynthesis is equal to the rate of respiration. At this point, carbon dioxide released from respiration is equivalent to that which is taken up during photosynthesis. When the light intensity increases, the compensation point is reached. When light intensity is increased beyond the compensation point, the rate of photosynthesis increases proportionally until the point of light saturation is reached. Beyond light saturation point, the rate of photosynthesis is no longer affected by light intensity. Compensation point varies in different species of plants. It even varies in response to changes in temperature and other environmental factors.
Which of the following statements is correct? End products of protein hydrolysis are
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Mixture of amino acids
0%
Sugars
0%
Peptides
0%
30 amino acids
In glycolysis during which reaction, water molecule is released
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0%
2-phosphoglyceric acid phosphoenol pyruvic acid
0%
PGAL 3 PGA
0%
1, 3-biphosphoglyceric acid Phosphoglyceric acid
0%
Phosphoenol pyruvic acid Pyruvic acid
Explanation
In glycolysis, when 2-phosphoglyceric acid is acted upon by enolase enzyme to form phosphoenol pyruvic acid, H2O is released. So the answer is '2-phosphoglyceric acid phosphoenol pyruvic acid'.
Arrange the following compounds formed in respiration based on their C-atoms
i) Pyruvic acid
ii) -Ketoglutaric acid
iii) Citric acid
iv) Malic acid
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iv, i, ii, ii
0%
ii, iv, ii, iii
0%
i, ii, iv, iii
0%
i, iv, iii, ii
Explanation
The correct order for the given compounds based on their C atoms would be:
pyruvic acid (3C), malic acid (4 C), ketoglutaric acid (5 C), citric acid (6 C).
So the answer is 'i,iv,ii,iii'.
Pick up the reactions from the following where a water molecule is removed and reduction of $$NAD^+$$ does not occur in the reactions of respiration.
i) Succinic acid to fumaric acid
ii) Malic acid to oxaloacetic acid
iii) 2-Phosphoglycerate to phosphoenol pyruvic acid
iv) Pyruvic acid to acetyl CoA
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i, iv
0%
i, ii
0%
ii, iii
0%
i, iii
Explanation
i and iii reactions in which water is removed, but $$NAD^+$$ is not reduced.
Succinic acid to Fumaric acid
$$FAD^+$$
$$\rightarrow$$
$$FADH^+$$ + $$H_2O$$
2-phosphoglycerate to phosphoenol pyruvic acid
$$2- Phosphoglycerate$$ $$\rightarrow$$ $$2-Phosphoenol\,pyruvic\,acid$$ +
$$H_2O$$
The ii and iv reaction occur in the following ways where
$$NAD^+$$ is reduced.
Malic acid to Oxaloacetic acid
$$Malic\,acid$$ + $$NAD^+$$ $$\rightarrow$$ $$Oxaloacetic\,acid$$
+
$$NADH^+$$ +
$$H_2O$$
Pyruvic acid to Acetyl CoA
$$Pyruvic\,acid$$ + $$NAD^+$$
+ $$CoA$$
$$\rightarrow$$ $$Acetyl\,CoA$$ + $$NADH$$
+ $$CO_2$$+ $$H_2$$
So, the correct option is D.
Maximum energy is liberated on respiratory breakdown of
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0%
Protein
0%
Fat
0%
Carbohydrate
0%
Nucleic acid
Explanation
B. Fat.
Solution: Fat contains more energy than carbohydrates and proteins. it is composed of fatty acids and glycerol. The body needs fats for growth and energy. In oxidation, fats releases 9cal/gm of fat.
So, the correct answer is (B).
In which of the following reduction of NAD does not occur?
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0%
Isocitric acid
$$\to$$
$$\alpha$$-ketoglutaric acid
0%
Malic acid
$$\to$$
oxaloacetic acid
0%
Pyruvic acid
$$\to$$
acetyl coenzyme
0%
Succinic acid
$$\to$$
fumaric acid
Explanation
The conversion of succinic acid to fumaric acid is one of the steps in the Krebs cycle. The conversion is catalyzed by the enzyme succinic dehydrogenase and $$FAD$$ is reduced to $$FADH_2$$. Thus the correct answer is option D.
During respiration
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$$PGAL$$ is not produced during respiratory events
0%
$$2\ PGAL$$ during glycolysis and $$4$$ pyruvic acid are produced in Krebs' cycle
0%
$$2\ PGAL$$ during glycolysis and $$2$$ pyruvic acid are produced in Krebs' cycle
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$$2\ PGAL$$ during glycolysis and none of the $$PGAL$$ produced in Krebs' cycle
Explanation
During respiration 2 molecules of glyceraldehyde 3- phosphate (PGAL) are formed in glycolysis, but no such compound is formed in TCA or Krebs' cycle.
RQ is infinite in
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Aerobic respiration
0%
Anaerobic respiration
0%
Carbohydrates
0%
None of these
Explanation
Anaerobic respiration is the respiration which takes place in the absence of oxygen. It is also known as fermentation. It takes place in the unicellular organisms. It leads to production of two ATP.
Respiratory quotient is the ratio of volume of carbon dioxide produced to volume of oxygen consumed.
In anaerobic respiration no oxygen is required. i.e., it occurs in the absence of oxygen and so, the RQ is infinity.
So, the correct answer is option B.
Pyruvic acid is produced at the end of
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0%
Glycolysis
0%
Krebs cycle
0%
Calvin cycle
0%
Photorespiration
Explanation
A single glucose molecule in glycolysis produces a total of 2 molecules of pyruvic acid, 2 molecules of ATP, 2 molecules of NADH and
2molecules of water.
During aerobic respiration, the conversion of pyruvate into acetaldehyde along with TPP, the cofactor is
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0%
$$Mg^{2+}$$
0%
$$Mn^{2+}$$
0%
$$Fe^{3+}$$
0%
$$Zn^{2+}$$
Explanation
During anaerobic respiration, the enzyme pyruvate decarboxylase converts pyruvate into acetaldehydre and carbon dioxide. This is a decarboxylation reaction. The enzyme requires TPP (thiamine pyrophosphate) and Mg$$^{+2}$$ as a cofactor for the reaction to takes place.
Thus, the correct answer is option A.
Aerobic respiratory pathway is appropriately called as
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0%
Anabolic
0%
Catbolic
0%
Amphibolic
0%
Parabolic
Explanation
Aerobic respiratory pathway is appropriately called amphibolic pathway. It contains both catabolic and anabolic reactions. The pathway is catabolic because in this pathway, glucose is broken down into carbon dioxide and water. It is also anabolic pathway as energy rich ATP molecule is produced during this pathway. These ATP molecules are later used to carry out various reaction.
Thus, the correct answer is option C.
Which of the following molecules is common to respiration mediated breakdown of major biomolecules?
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0%
AcetylCoA
0%
Glucose 6-phosphate
0%
Fructose 1, 6 - biphosphate
0%
Pyruvic acid
Explanation
Acetyl Co-A is common in respiration mediated breakdown of major biomolecules like fats, carbohydrates, and proteins. It is an integral part of many cellular processes. It provides carbon atom required for the citric acid cycle. It is produced via glycolysis (breakdown of carbohydrates), gluconeogenesis (breakdown of protein) and fatty acid oxidation.
Thus, the correct answer is option A.
The anaerobic respiration is also called as.
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0%
Fermentation
0%
Fragmentation
0%
Oxidation
0%
Reduction
Explanation
Fermentation is an anaerobic process in which energy can be released from glucose even though oxygen is not available. Fermentation occurs in yeast cells, and a form of fermentation takes place in bacteria and in the muscle cells of animals. So, the correct answer is option A.
Enzyme required to oxidise acetaldehyde is
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0%
Ethanol oxidase
0%
Acetaldehyde dehydrogenase
0%
Alcohol hydrogenase
0%
Glyceraldehyde dehyadrogenase
Explanation
Acetaldehyde dehydrogenase enzyme oxidises acetaldehyde into acetate. This enzyme belongs to class of aldehyde dehydrogenases. Acetaldehyde is produced from the metabolism of alcohol by the enzyme alcoholic dehydrogenase. Acetaldehyde is toxic and its accumulation can lead to effects of hangover so it needs to be metabolized. It is converted into acetate by aldehyde dehydrogenase. Acetate is then converted into carbon dioxide and water. These metabolic reactions occur in liver.
So, the correct answer is 'Acetaldehyde dehydrogenase'.
During fermentation by yeast, alcohol is formed from
Report Question
0%
Proteins
0%
Sugars
0%
Mucopolysaccharides
0%
Fats
Explanation
Alcohol is formed from the fermentation of sucrose or any other sugar source by $$Saccharomyces\ cerevisiae$$ (yeast).
So the correct answer is 'Sugars'
Dinitrophenol inhibits cell function by disrupting ________________.
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0%
Citric acid cycle
0%
Oxidative phosphorylation
0%
Glycolysis
0%
Gluconeogenesis
Explanation
The increase in the concentrations of dinitrophenol, reduced oxidative phosphorylation, which results in a deficiency of ATP. As ATP is required in citric acid production, citric acid output is decreased.
So, the correct option is 'A'.
In Krebs cycle
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Energy is stored in the form of ATP
0%
Energy is stored in the form of ADP
0%
Energy is liberated from ATP
0%
Energy is liberated from ADP
Explanation
The actual ATP generation steps of aerobic respiration occur during passage of electrons along ETS. Total four NADH is produced which leads to the production of 12 ATP. One FADH$$_2$$ leads to the production of two ATP. One GTP is formed. So 15 ATP is produced in one cycle of Kreb's Cycle. So two cycle leads to the production of 30 ATP.
The very first step in the formation of acetyl Co-A is the _____________________.
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Formation of a complex between thiamine pyrophosphate and Pyruvate
0%
Release of the acetyl group from liquid acid to Co-A
0%
Decarboxylation of Pyruvate
0%
Transfer of electrons from reduced lipoid acid to NAD
The citric acid cycle _________________.
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Contains intermediates for amino acid synthesis
0%
Generates fewer molecules of ATP than glycolysis
0%
Is an anaerobic process
0%
Is the major anabolic pathway for glucose synthesis
Among the following substances, which one has the highest Respiratory Quotient?
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Glucose
0%
Malic acid
0%
Oxalic acid
0%
Palmitic acid
Enzyme that changes glucose to ethyl alcohol is
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0%
Zymase
0%
Diastase
0%
Invertase
0%
Maltase
Explanation
A) Zymase causes the breakdown of sugars into alcohols.
B) Diastase catalyses the breakdown of starch into maltose.
C) Invertase is an enzyme that catalyses the breakdown of sucrose into fructose and glucose.
D) Maltase breaks down maltose to glucose.
So the correct answer is 'Zymase'
Why Kreb cycle is also known as citric acid cycle ?
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0%
Due to first stable product as citric acid
0%
First stable product citric acid contain two carboxyl group
0%
First stable product citric acid contain 3-carboxyl group
0%
Citric acid is devoid of any -COOH group
Explanation
Correct option: A
Explanation:
The first stable product of Kreb's cycle is
citric acid
.
It is formed as a result of the reaction between
oxaloacetate and acetyl CoA.
The 4 carbon and 2 carbon compound give rise to a
6 carbon compound.
Hence, "
d
ue to first stable product as citric acid
",
Kreb cycle is also known as a citric acid cycle.
The very first step in the formation of acetyl CoA is the.
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0%
Formation of a complex between thiamine pyrophosphate and syndicate
0%
Release of the acetyl group from lipoid acid to CoA
0%
Dicarboxylation of pyruvate
0%
Transfer of electrons from reduced lipoid acid to NAD
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