Difficulty distribution
How the classified questions are distributed by difficulty.
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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.
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Year-wise coverage for Metabolism, Enzymes and Hormones. Each bar uses a separate theme-derived color.
How the classified questions are distributed by difficulty.
MCQ, numerical, multiple-select and other formats found in these papers.
Top subjects by unique question coverage.
Top topics across the included previous year papers.
Top subtopics inside this exact selection.
Question coverage for the most populated papers. Every active PYP paper remains listed below.
Newest papers appear first. Sort by year, question coverage or name.
| Paper | Year / session | Questions in this view | Open |
|---|---|---|---|
| Life Sciences (XL) 2026 | 2026 | 4 | View paper |
| Life Sciences (XL) 2025 | 2025 | 1 | View paper |
| Life Sciences (XL) 2024 | 2024 | 6 | View paper |
| Life Sciences (XL) 2023 | 2023 | 5 | View paper |
| Life Sciences (XL) 2022 | 2022 | 2 | View paper |
| Life Sciences (XL) 2021 | 2021 | 3 | View paper |
| Life Sciences (XL) 2020 | 2020 | 8 | View paper |
| Life Sciences (XL) 2019 | 2019 | 3 | View paper |
| Life Sciences (XL) 2018 | 2018 | 6 | View paper |
| Life Sciences (XL) 2017 | 2017 | 3 | View paper |
| Life Sciences (XL) 2016 | 2016 | 7 | View paper |
| Life Sciences (XL) 2015 | 2015 | 2 | View paper |
| Life Sciences (XL) 2014 | 2014 | 3 | View paper |
| Life Sciences (XL) 2013 | 2013 | 5 | View paper |
| Life Sciences (XL) 2012 | 2012 | 6 | View paper |
| Life Sciences (XL) 2011 | 2011 | 3 | View paper |
| Life Sciences (XL) 2010 | 2010 | 2 | View paper |
| Life Sciences (XL) 2009 | 2009 | 4 | View paper |
| Life Sciences (XL) 2008 | 2008 | 7 | View paper |
| Life Sciences (XL) 2007 | 2007 | 8 | View paper |
Practice every matching question in batches of 20, with every available option.
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?
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,
Which of the following statements about the enzyme complexes of the electron transport system is correct?
If the cytosolic NADH is transported to the matrix by the glyceraldehydes 3-phosphate shuttle, then the number of ATPs synthesized is
How many kilograms of ethanol is produced from 1 kilogram of glucose in ethanol fermentation?
Which of the following inhibitor uncouples electron transport and oxidative phosphorylation?
Glycolysis and gluconeogenesis are reciprocally coordinated. Which of the following will activate pyruvate carboxylase in gluconeogenesis?
The formation of ATP from ADP and Pi is not a spontaneous reaction. A reason for this is
| Group I | Group II |
|---|---|
| P. Fatty acid + GTP + Co A ⇌ Acyl-CoA + GDP + Pi | 1. Fatty acid synthesis |
| Q. NH3 + Glutamate + ATP ⇌ Glutamine + ADP + Pi | 2. Fatty acid oxidation |
| R. Succinate + E – FAD ⇌ Fumarate + E – FADH2 | 3. Oxidative phosphorylation |
| S. Malonyl-S-CoA + ACP-SH ⇌ Malonyl-S-ACP + CoA-SH | 4. Citric acid cycle |
| 5. Gluconeogenesis | |
| 6. Amino acid biosynthesis |
| Group I | Group II |
|---|---|
| P. Förster mechanism | 1. The initial product inhibit the initial reaction |
| Q. Ping-Pong reaction | 2. The accumulation of end product inhibit the initial reaction |
| R. Feed-back inhibition | 3. Process of exciton transfer in chromophore molecule |
| S. DNA recombination | 4. Double displacement reaction |
| 5. Michaelis-Menten enzyme kinetics | |
| 6. Holliday model |
Showing 20 of 88 questions