Chapter 3 (Biological Molecules) is one of the most important chapters in MDCAT Biology. Every year, multiple questions appear from this chapter in the actual exam. Practice these solved MCQs covering Carbohydrates, Proteins, Lipids, Nucleic Acids to strengthen your preparation. All questions include correct answers and detailed explanations written by experts.
We have carefully curated MCQs from Chapter 3 (Biological Molecules) following the official MDCAT 2026 syllabus. Each question comes with the correct answer and detailed explanation.
Practice Biology MCQs Now Take Full MDCAT Mock TestBelow are important MCQs from MDCAT Biology Chapter 3 (Biological Molecules). Each question includes the correct answer highlighted in green and a detailed explanation to help you understand the concept.
Peptide bonds form through condensation reactions between the amino group of one amino acid and the carboxyl group of another.
DNA has deoxyribose sugar (missing oxygen at 2' carbon) and thymine instead of uracil found in RNA.
Starch is made of glucose monomers linked by alpha-glycosidic bonds. It exists as amylose (unbranched) and amylopectin (branched).
Saturated fatty acids have no C=C double bonds. All carbons are "saturated" with hydrogen, making them solid at room temperature.
Secondary structure = local folding patterns: alpha-helices and beta-pleated sheets, stabilized by hydrogen bonds between backbone atoms.
Phospholipids have a hydrophilic head and hydrophobic tails, forming the phospholipid bilayer - the basis of all cell membranes.
Lactose (milk sugar) = glucose + galactose linked by beta-glycosidic bond. Lactose intolerance = lactase deficiency.
The R-group (side chain) is the variable part giving each of the 20 standard amino acids its unique chemical properties.
Cellulose has beta-1,4 glycosidic bonds (vs alpha in starch). Humans lack cellulase enzyme so cannot digest cellulose.
Uracil replaces thymine in RNA. It pairs with adenine through two hydrogen bonds during transcription and translation.
Our full question bank has 100+ MCQs for this chapter alone. Practice in quiz mode with instant scoring, timer, and detailed performance analytics.
Start Full Quiz ModeBiological Molecules is a fundamental chapter in MDCAT Biology. This chapter covers the following important topics that frequently appear in the MDCAT exam:
By practicing these MCQs, you will develop a strong understanding of Biological Molecules concepts and be well-prepared for the MDCAT 2026 exam.
Follow these expert tips to master Biological Molecules and score maximum marks in MDCAT:
Based on analysis of past MDCAT papers, these topics from Chapter 3 (Biological Molecules) are most frequently tested:
This Biology chapter is also tested in other Pakistani entry tests. Practice the same topics with exam-specific focus:
In MDCAT, Biology typically has 210 total MCQs. Chapter 3 (Biological Molecules) usually contributes 3-5 MCQs in the actual exam. On Apna MCQs, we provide 10+ practice MCQs with detailed explanations for thorough preparation.
Yes! All MCQs on Apna MCQs are updated according to the latest Pakistan Medical Commission (PMC) MDCAT 2026 syllabus. Our team of expert educators regularly reviews and adds new questions based on the latest exam patterns and past papers.
Our Biological Molecules MCQs cover all important topics including Carbohydrates, Proteins, Lipids and more. Each topic has multiple MCQs ranging from easy to hard difficulty to ensure comprehensive preparation.
To prepare Biological Molecules for MDCAT: 1) Read the textbook thoroughly, 2) Make notes of key concepts, 3) Practice MCQs on Apna MCQs with explanations, 4) Take mock tests, 5) Review weak areas. Our chapter-wise approach ensures you cover all 16 chapters systematically.
After completing Chapter 3, move to the next chapter on Apna MCQs. We cover all 16 chapters of Biology with chapter-wise MCQs. You can also take full-length MDCAT mock tests for timed practice.
Our MCQs include questions modeled on MDCAT past papers as well as original questions created by subject experts. The questions cover all topics in Biological Molecules that are part of the official MDCAT syllabus.
Absolutely! While these MCQs are organized for MDCAT preparation, the content covers the same Biology Chapter 3 (Biological Molecules) topics tested in FSc/Inter board exams. Many students use Apna MCQs for both board and entry test preparation.
Yes! Apna MCQs provides free access to chapter-wise MCQs for MDCAT, ECAT, LAT, IBA, Nursing and other entry tests. We believe quality education should be accessible to every student in Pakistan.
