At which step, glycolysis reaches the break-even point: 2
molecules of ATP consumed, and 2 new molecules synthesized ?
1. Splitting of fructose-6-phosphate to two trioses
2. Conversion of 1,3 bi-phosphoglycerate to 3 phosphoglycerate
3. Coversion of GADP to 1,3 biphosphoglycerate
4. Conversion of DHAP to GADP
Under which condition would you expect the mitochondrial proton gradient to be highest and therefore ATP synthesis to proceed?
1. pyruvate (present)-oxygen (present)-ATP levels (high)
2. pyruvate (present)-oxygen (present)-ATP levels (low)
3. pyruvate (present)-oxygen (absent)-ATP levels (high)
4. pyruvate (absent)-oxygen (present)-ATP levels (low)
What is the net gain of number of ATP molecules produced during aerobic respiration of one molecule of glucose?
In the absence of oxygen, the primary purpose of fermentation is to:
1. produce amino acids for protein synthesis
2. generate a proton gradient for ATP synthesis
3. oxidize glucose to generate reduce electron carriers
4. regenerate NAD+ from NADH allowing glycolysis to continue
During glycolysis, when glucose is catabolized to pyruvate, most of the energy of glucose is
1. transferred to ADP, forming ATP.
2. transferred directly to ATP.
3. retained in the pyruvate.
4. 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:
1. Glucose 6- phosphate from glucose
2. Fructose 1,6- bisphosphate from Fructose 6 - phosphate
3. Acetyl CoA from Pyruvic acid
4. Citric acid from Acetyl CoA and Oxaloacetic acid
Which statement is wrong for Krebs' cycle?
1. There are three points in the cycle where NAD+ is reduced to NADH + H+
2. There is one point in the cycle where FAD+ is reduced to FADH2
3. During conversion of succinyl Co-A to succinic acid, a molecule of GTP is synthesised
4. The cycle starts with condensation of acetyl group (acetyl Co-A) with pyruvic acid to yield citric acid
The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called
3. aerobic respiration
How many ATP molecules could maximally be generated from one molecule of glucose, if
the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the
useful chemical energy available in the high energy phosphate bond of one mole of ATP is
3. Fifty seven
After glycolysis, fate of glucose in mitochondrial matrix is
(3) oxidative decarboxylation
Which enyme helps in transfer of phosphate group from ATP to carbohydrate?
RQ (Respiratory Quotient) is defined as
The process by which ATP is produced in the inner membrane of a mitochondrion. The electron transport system transfers protons from the inner compartment of the outer; as the protons flow back to the inner compartment, the energy of their movement is used to add phosphate to ADP, forming ATP.
Which of the following act as a respiratory substrate under certain conditions in the plant-animal?
Following are the statements. Choose the correct ones.
p. Each living cell in plant is located quite close to the surface of the plant.
q. In stem, the living cells are organised in thin layers inside and beneath the bark
r. Stems have openings called lenticel
s. A part of living cell is somehow in contact with outer environment
t. The loose packing of parenchyma cells in leaves, stems and roots provide an interconnected network of air spaces to facilitate the direct availability of gases
The complete combustion of glucose
(1) Most of which is given out in the form of ATP
(2) Most of which is given out in the form of heat
(3) Most of which is given out in the form of NADH
(4) Most of which is given out in the form of FADH2
If two molecules of sucrose have to be respired, how many molecules of ATP are produced in anerobic oxidation?
When does NADH is produced in cellular respiration?
(1) Conversion of PGAL to PGA
(2) Conversion of PGAL to DHAP
(3) Conversion of PGAL to BPGA
(4) Conversion of BPGA to PGA
The energy yielding steps of glycolysis are
(1) Conversion of PGA to BPGA and Conversion of PGAL to DHAP
(2) Conversion of PGAL to PGA and Conversion of BPGA to PGA
(3) Conversion of BPGA to PGA and Conversion of PEP to Pyruvate
(4) Conversion of pyruvate to PEP and PGAL to DHAP
What is the total amount of ATP produced in Glycolysis?
Fermentation can take place in
(1) Anaerobic conditions in many prokaryotes and unicellular Eukaryotes
(3) Cancer cells
(4) All of these
The enzymes involved in Alcoholic Fermentation is not
(1) Pyruvate decarboxylase
(2) Alcohol dehydrogenase
(3) Lactate dehydrogenase
Pyruvate is a result of …… of carbohydrates.
(1) Glycolytic fermentation
(2) Glycolytic aerobic respiration
(3) Glycolytic catabolism
(4) Glycolytic anabolism
How many molecule of NADH are produced during oxidation of one molecule of Glucose to Acetyl CoA?
(4) 12 NADH
Choose the incorrect option for why plants can get along without respiratory organs as plants, unlike animals, have no specialized organs for gaseous exchange.
1.Respiration rate is faster than animals in roots, stems and leaves
2. O2 released during photosynthesis is utilized for respiration
3. Loose packing of parenchyma cells in leaves, stems and roots facilitates respiration
4. There is very little transport of gases from one plant part to another
Read the following statements and choose the correct option :
1. Respiration is purely a catabolic process
2. Reduction of food results in the release of energy
3. Chemical energy is broken down during respiration to release energy
4. Fungi can make their own food and derive the energy by respiration
1. Cannot use oxygen for growth and are even harmed by it
2. Cannot use oxygen for growth, but tolerate the presence of it
3. Are aerobes which can gro without oxygen
4. Die when given aerobic condition
Interconversion of glyceraldehyde-3-phosphate and dihydroxyacetone phosphate is catalysed by which enzyme ?
1. Phosphotriose isomerase
2. Phosphohexose isomerase
4. Triose kinase
Common step of both aerobic and anaerobic respiration are
1. EMP pathway
2. Tricarboxylic acid cycle
3. Acetyl CoA formation
4. Citric acid cycle
After glycolysis, first step of ethyl alcohol fermentation requires
3. FAD reduction
4. Mn+2 acceptance
Ubiquinone receives reducing equivalents from
4. Both 2 and 3
Products of anaerobic respiration are
1. Ethyl alcohol and lactic acid only
2,. Ethyl alcohol and CO2 and metabolic H2O
3. Ethyl alcohol, metabolic and lactic acid
4. Ethyl alcohol, CO2 or lactic acid
The efficiency of aerobic respiration is approximately
Last acceptor of electrons is ____in ETS which give electrons to oxygen
1. Cyt c1
2. Cyt c
3. Cyt a-a2
4. Cyt bc1
Total energy obtained from 38 ATP is __ kJ
Protons for the formatiojn of ATP first pass from
1. F0 part
2. F1 head piece
3. Cyt c
4. Complex II
Which of these has R.Q. value more than one ?
4. Organic acids
Select the statement which is not related to fermentation
1. It accounts for only a partial breakdown of glucose
2. It gives only 2 ATP as net for glucose degradation upto pyruvic acid
3. NADH is oxidized slowly as compared to aerobic respiration
4. ETS gives 11 ATP for each Krebs cycle
Mobile electrons carriers in ETS in mitochondrial membrane are
2. CoQ, Cyt c
3. PQ, Cyt c
4. PC, CoQ
Number of total ATP generated in TCA cycle per Acetyl CoA molecule is
In alcohol fermentation, ____ of energy in glycose in released and not all of it is trapped as high energy bonds ATP
1. Less than 1%
2. More than 10%
3. Less than 7%
4. More than 40%
Total number of ATP produced through ETS only from one molecule of 3-phosphoglycerate in aerobic respiration is
Arrange the RQ value of following respiratory substrated in ascending order
(d) Succulents (night)
4. (c),(b),(a) &(d)
Inhibition of sugar breakdown due to presence of O2 under anaerobic condition is called
1. Pasteur effect
2. Warburg effect
3. Crabtree effect
4. Kutusky effect
Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins ?
2. Fructose 1,6-biphosphate
3. Pyruvic acid
4. Acetyl CoA
A : Succinyl CoA is the precursor of pyrrole group containing compounds
R : Succinyl CoA is an intermediate of TCA cycle
The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATPP) is formed because
1. There is a change in the permeability of the inner mitochondrial membrane forward adenosine diphosphate (ADP)
2. High energy bonds are formed in mitochondrial proteins
3. ADP is pumped out of the matrix into the intermembrane space
4. A proton gradient forms across the inner membrane
In glycolysis, during oxidation electrons are removed by
4. Molecular oxygen