1Biologymembrane integrity
Which property of water helps to maintain the integrity of cell membrances?
- A.Specific heat capacity
- B.Hydrogen bonding
- C.Cohesion and adhesion
- D.Hydrophobic exclusion
Answer and explanation locked
Biological Molecules MCQs for MDCAT
9 Biological Molecules questions from real MDCAT past papers (2020), each with the correct answer and a written explanation.
9 questionsBiology
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2Biologysolvent properties
Water act as universal solvent because of
- A.Heat of vaporization
- B.Hydrogen bonding
- C.High polarity
- D.Cohesion and adhesion
Answer and explanation locked
3Biologyenergy content
Lipids store double amount of energy as compared to carbohydrtes because of
- A.High proportion of oxygen
- B.High C-O ratio
- C.Low proportion of carbon
- D.High proportion of C-H
Answer and explanation locked
4Biologyfatty acids
Which of the following is an unsaturated fatty acid?
- A.Oleic acid
- B.Palmitic acid
- C.Butyric acid
- D.Acetic acid
Answer and explanation locked
5Biologynad
NAD is an example of
- A.Mononucleotide
- B.Dinucleotide
- C.Tri nucleotide
- D.Tetra cucleotide
Answer and explanation locked
6Biologynucleic acids
Which one of the following is found both messgenger RNA an DNA of a mammalian cell?
- A.Double helical structure
- B.Ribose sugar
- C.Thymine
- D.Sugar- phosphate backbone
Answer and explanation locked
7Biologytranscription
Transcription is the process in which an RNA copy of the DNA sequence and coding the gene is produced with help of an enzyme called:
- A.DNA polymerases
- B.RNA polymerase
- C.DNA transcriptase
- D.RNA trnscriptase
Answer and explanation locked
8Biologytranscription
Which statement correctly describes transcription of DNA?
- A.It produces aminon acids
- B.It produces messenger RNA
- C.It results in increased DNA synthesis
- D.It is a semi conservative process
Answer and explanation locked
9Biologydna ligase
What is the effect of DNA ligase?
- A.DNA is broken up at specific sits
- B.DNA fragments are joined together
- C.DNA replication occurs
- D.DNA transcription occurs
Answer and explanation locked
How Biological Molecules is examined
Biological Molecules sits in the official PMDC Biology curriculum, the document that defines what can and cannot appear in the 2026 paper. Everything on this page is tagged against that curriculum rather than against a chapter list invented for a website, which is why a chapter here matches the chapter your textbook and your teacher use.
Biology carries 81 of the 180 questions in the real paper - 45% of your MDCAT score, and the MDCAT is half your merit aggregate. PMDC does not publish how those 81questions are split across chapters, so no honest page can tell you “expect four from Biological Molecules”. What the archive can tell you is what actually appeared: 9 Biological Molecules questions out of the 77 Biology questions digitised so far.
Work through them with the explanations rather than checking answer letters. The explanation says why the other three options are wrong, and distractors get reused across years far more reliably than whole questions do.
Frequently asked questions
How many Biological Molecules MCQs are on this page?
9, drawn from one past paper - the 2020 paper. Every one is transcribed from the real paper rather than written to look like a past paper question, and each carries the correct answer with a written explanation. 0 of them are readable in full without an account.
Is Biological Molecules in the MDCAT 2026 syllabus?
Yes. Biological Molecules is a chapter of the official PMDC Biology curriculum, and PMDC has confirmed the 2026 syllabus is unchanged from the 2025 revision, so everything on this page is still examinable.
How many Biological Molecules questions come up in the MDCAT?
PMDC does not publish a per-chapter breakdown, so nobody can tell you a reliable number - be careful with pages that do. What can be counted is the paper as a whole: Biology is 81 of the 180 questions, and 12% of the Biology questions in our archive so far have come from Biological Molecules.
Do these Biological Molecules MCQs come with explanations?
Yes, and they are written from scratch rather than copied. An answer letter tells you nothing about why the other three options are wrong, which is the part that transfers to the next question. The first 0 questions of every paper are free to read in full; the rest need a pass.