MDCAT Biology — Bioenergetics
Bioenergetics is a core Biology topic in the PMDC MDCAT syllabus, covering 4 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (4)
- Cyclic and Non-Cyclic Photophosphorylation
- Photosynthesis
- Pigments and Light Absorption
- Respiration
How Bioenergetics is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Bioenergetics accounts for 68 questions. It appears in all 16, about 4.3 questions a paper. The heaviest was MDCAT 2014, with 8 questions, and the most recent is MDCAT 2025, with 1.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 1 |
| MDCAT 2024 | 4 |
| MDCAT 2023 | 3 |
| MDCAT 2022 | 5 |
| MDCAT 2019 | 4 |
| MDCAT 2018 | 3 |
| MDCAT 2017 | 3 |
| MDCAT 2016 | 4 |
| MDCAT 2015 | 3 |
| MDCAT 2014 | 8 |
| MDCAT 2013 | 5 |
| MDCAT 2012 | 6 |
| MDCAT 2011 | 5 |
| MDCAT 2010 | 5 |
| MDCAT 2009 | 5 |
| MDCAT 2008 | 4 |
Bioenergetics MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Bioenergetics
The most primitive respiratory process occurring in a living cell is:
- A.Lactic acid fermentation
- B.Alcoholic fermentation
- C.Glycolysis
- D.Krebs's cycle
Show answer
Answer: C. Glycolysis — Glycolysis is the most primitive respiratory process in living cells.
- Q2 · MDCAT 2024 · Bioenergetics
In Calvin cycle CO₂ reacts with RuBP to produce __________
- A.3-PGA
- B.G3P
- C.6-Carbon unstable intermediate
- D.1,3 bisphosphoglycerate
Show answer
Answer: C. 6-Carbon unstable intermediate — CO2 + RuBP first forms an unstable 6-carbon intermediate, which immediately splits into two 3-PGA molecules.
- Q3 · MDCAT 2023 · Bioenergetics
Which is the major event in electron transport chain?
- A.ATP synthesis
- B.Decarboxylation
- C.Substitution
- D.Isomerisation
Show answer
Answer: A. ATP synthesis — ATP synthesis is the major outcome of the electron transport chain, via oxidative phosphorylation.