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Previous year question hub

Metabolism, Enzymes and Hormones - Biochemistry and Molecular Biology - Life Sciences Previous Year Questions

Practice Metabolism, Enzymes and Hormones - Biochemistry and Molecular Biology - Life Sciences previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

20Papers
20Years
88Questions
1Topics

Metabolism, Enzymes and Hormones question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Metabolism, Enzymes and Hormones. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Medium 50 56.8%
Easy 38 43.2%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 69 78.4%
Numerical Answer Type (NAT) 12 13.6%
MSQ 7 8%

Subject weightage

Top subjects by unique question coverage.

Life Sciences
88 Qs

Most asked topics

Top topics across the included previous year papers.

Biochemistry and Molecular Biology
88 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Metabolism, Enzymes and Hormones
88 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Life Sciences (XL) 2026
4 Qs
Life Sciences (XL) 2025
1 Qs
Life Sciences (XL) 2024
6 Qs
Life Sciences (XL) 2023
5 Qs
Life Sciences (XL) 2022
2 Qs
Life Sciences (XL) 2021
3 Qs
Life Sciences (XL) 2020
8 Qs
Life Sciences (XL) 2019
3 Qs
Life Sciences (XL) 2018
6 Qs
Life Sciences (XL) 2017
3 Qs
Life Sciences (XL) 2016
7 Qs
Life Sciences (XL) 2015
2 Qs
Life Sciences (XL) 2014
3 Qs
Life Sciences (XL) 2013
5 Qs
Life Sciences (XL) 2012
6 Qs
Life Sciences (XL) 2011
3 Qs
Life Sciences (XL) 2010
2 Qs
Life Sciences (XL) 2009
4 Qs
Life Sciences (XL) 2008
7 Qs
Life Sciences (XL) 2007
8 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
Life Sciences (XL) 202620264View paper
Life Sciences (XL) 202520251View paper
Life Sciences (XL) 202420246View paper
Life Sciences (XL) 202320235View paper
Life Sciences (XL) 202220222View paper
Life Sciences (XL) 202120213View paper
Life Sciences (XL) 202020208View paper
Life Sciences (XL) 201920193View paper
Life Sciences (XL) 201820186View paper
Life Sciences (XL) 201720173View paper
Life Sciences (XL) 201620167View paper
Life Sciences (XL) 201520152View paper
Life Sciences (XL) 201420143View paper
Life Sciences (XL) 201320135View paper
Life Sciences (XL) 201220126View paper
Life Sciences (XL) 201120113View paper
Life Sciences (XL) 201020102View paper
Life Sciences (XL) 200920094View paper
Life Sciences (XL) 200820087View paper
Life Sciences (XL) 200720078View paper

All Metabolism, Enzymes and Hormones previous year questions

Practice every matching question in batches of 20, with every available option.

1
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007

One of the carbon atoms of a glucose molecule is [14C]-labeled. If 14CO2 is released during the conversion of pyruvate to acetyl coenzyme-A, which carbon atom of glucose was radiolabeled?

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2
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007

Folate derivatives are required for the synthesis of which deoxynucleotides?

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3
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007

Cytochrome C reductase, also called as Complex III or cytochrome bc1 complex, localized on the inner mitochondrial membrane receives electrons from ubiquinol and donates to cytochrome C. In one cycle,

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4
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007

Which of the following statements about the enzyme complexes of the electron transport system is correct?

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5
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007
The number of ATP molecules that can be synthesized by the oxidation of one NADH molecule is
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6
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007

If the cytosolic NADH is transported to the matrix by the glyceraldehydes 3-phosphate shuttle, then the number of ATPs synthesized is

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7
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007
The respiratory coefficient for the reaction \(a\text{CH}_m\text{O}_n + b\text{O}_2 + e\text{NH}_3 \rightarrow d\text{CH}_p\text{O}_q\text{N}_r + e\text{H}_2\text{O} + f\text{CO}_2\) is defined as
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8
2007 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2007

How many kilograms of ethanol is produced from 1 kilogram of glucose in ethanol fermentation?

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9
2008 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2008

Which of the following inhibitor uncouples electron transport and oxidative phosphorylation?

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10
2008 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2008
Match the enzymes in Column I with their metabolic pathways in Column II.
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11
2008 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2008

Glycolysis and gluconeogenesis are reciprocally coordinated. Which of the following will activate pyruvate carboxylase in gluconeogenesis?

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12
2008 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2008
The following 4 different solutions are prepared by mixing the components of electron transport chain. Which among them is expected to cause a net transfer of electrons to cytochrome c?
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13
2008 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2008
NADH → Q → ? → Cytc1 → ? → Cyt a · a3 → O2 Sequence of electron transfer in oxidative phosphorylation is given above. Complete the missing sequence
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14
2008 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2008
Identify the products from the above reaction
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15
2008 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2008

Identify the enzyme and the type of reaction

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16
2009 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2009

The formation of ATP from ADP and Pi is not a spontaneous reaction. A reason for this is

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17
2009 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2009
Choose the correct pairs from the following:
a. Isocitrate lyase             i. Conversion of amino acids into glucose
b. PEP carboxykinase      ii. Biotin
c. Pyruvate dehydrogenase complex      iii. Synthesis of glucose from acetate
d. Phosphofructokinase           iv. Lipoic acid
e. Pyruvate carboxylase          v. An allosteric enzyme
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18
2009 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2009
Identify the pathways where the following reactions occur :
Group IGroup II
P. Fatty acid + GTP + Co A ⇌ Acyl-CoA + GDP + Pi1. Fatty acid synthesis
Q. NH3 + Glutamate + ATP ⇌ Glutamine + ADP + Pi2. Fatty acid oxidation
R. Succinate + E – FAD ⇌ Fumarate + E – FADH23. Oxidative phosphorylation
S. Malonyl-S-CoA + ACP-SH ⇌ Malonyl-S-ACP + CoA-SH4. Citric acid cycle
5. Gluconeogenesis
6. Amino acid biosynthesis
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19
2009 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2009
Group IGroup II
P. Förster mechanism1. The initial product inhibit the initial reaction
Q. Ping-Pong reaction2. The accumulation of end product inhibit the initial reaction
R. Feed-back inhibition3. Process of exciton transfer in chromophore molecule
S. DNA recombination4. Double displacement reaction
5. Michaelis-Menten enzyme kinetics
6. Holliday model
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20
2010 · Life Sciences · Biochemistry and Molecular Biology · Metabolism, Enzymes and Hormones
Life Sciences (XL) 2010
In the two half reactions Acetaldehyde + 2H+ + 2e → Ethanol ΔEo′ = −0.16 V NADH + H+ → NAD+ + 2H+ + 2e ΔEo′ = −0.32 V (F = 23,063 cal/V) The ΔGo′ for coupled reaction will be
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Showing 20 of 88 questions