MDCAT MCQs with Answers | Free Practice Tests

Test your Biology preparation with this MDCAT 2026 Biological Molecules Quiz for MDCAT, featuring 27 important MCQs on carbohydrates, lipids, fatty acids, amino acids, proteins, enzymes, coenzymes, enzyme inhibition, nucleic acids, and biological catalysts. Practice these MDCAT Biology MCQs to strengthen your concepts and prepare effectively for the MDCAT 2026 entrance test. Let us start with the online Biological Molecules Quiz for MDCAT 2026 now:

Online Biological Molecules Quiz for MDCAT 2026

1. Sara is a chemistry student who is experimenting with an alcohol and acetic acid in the laboratory. The product formed at the end of the experiment will be
2. Lipids contain double amount of energy as compared to the same amount of carbohydrates due to the presence of
3. Which of the following is an unsaturated fatty acid?
4. Which lipid is totally hydrophobic or insoluble?
5. —————– inhibitors have structural similarity with substrate
6. Enzyme B requires $Zn^{2+}$ in order to catalyze the conversion of substrate x. The zinc is best identified as a(n)
7. What about enzymes is wrong?
8. Which will cause the breakdown of the substrate?
9. One which help enzyme and is organic and non-protein
10. Which of the following is a coenzyme?
11. At a temperature below the freezing point of an enzyme is
12. The most important property of an enzyme is its
13. Enzyme inhibition caused by a substrate analog is
14. An amino acid consists of which of the following elements
15. The position of the double bond in oleic acid is
16. The highest percentage of RNA in the cell is of
17. What about pyrimidines is not correct?
18. One of the following is not true about biological catalysts
19. Which structure of an enzyme is essential for the special shape of its active site?
20. What is common in both competitive and non-competitive inhibition?
21. The type of energy reduced by the enzymes for biological reactions to occur is
22. Carbohydrates in cells combine with, and the resulting compounds are called glycoproteins and glycolipids, respectively.
23. Which of the following is a peptide bond?
24. An amino acid in which the R-group is hydrogen is
25. Myosin is a ————— type of protein
26. Secondary structure of protein is found in
27. Fatty acids are the organic compounds containing hydrogen, oxygen, and one of the following

Try online General Knowledge Quiz

Prepare for the MDCAT Biology test with this Biological Molecules MCQs Quiz covering key concepts in enzymes, proteins, amino acids, carbohydrates, disaccharides, glycosidic bonds, protein structure, ribozymes, and enzyme activity. These practice questions are designed to help MDCAT aspirants assess their understanding and prepare effectively for the medical entrance test. Let us start with the online Biological Molecules MCQs for MDCAT Preparation:

Online Biological Molecules MCQs for MDCAT with Answers

• What term is used to describe the process by which proteins are synthesized from a genetic code?
• Poisons like cyanide, antibiotics, and some drugs are examples of
• Which step causes activation of the catalytic site of an enzyme?
• A certain enzyme will hydrolyze egg white but not starch. Which statement best explains this observation?
• Which statement about enzymes is not true?
• The proteinaceous part of a holoenzyme is
• Why do drastic changes in the temperature or pH of a system alter enzyme activity?
• Why do drastic changes in the temperature or pH of a system alter enzyme activity?
• Which of the following statements about enzymes is true?
• The rate of any enzyme-controlled reaction increases rapidly if the amount of enzyme is doubled in the presence of an unlimited substrate concentration. This is due to
• A ribozyme is —————– with a well-defined tertiary structure that enables it to catalyze a chemical reaction
• Starch is present in tubers, fruits and grains but absent in animal cells; instead, animals have a substance stored in liver and muscles known as
• Which is an example of a disaccharide?
• The covalent bond or bridge between two monosaccharides to form a disaccharide is called a
• Glycosidic bond is formed by the
• Most proteins are made up of
• In glycine, R is ——————–?
• The structure of a fibrous protein comprises polypeptide chains in the form of
• Which of the following holds the alpha helix of protein in its place?
• The number and sequence of amino acids along a polypeptide chain is called —————- structure of a protein

Try online General Knowledge Quiz

Test your MDCAT Biology preparation with this MDCAT Biological Molecules Quiz featuring 20 important MCQs. The quiz covers proteins, carbohydrates, lipids, DNA, RNA, enzymes, amino acids, nucleic acids, tRNA, translation, enzyme inhibition, and other important concepts in biological molecules. Practice these MDCAT Biology MCQs to strengthen your concepts, improve accuracy, and prepare effectively for the MDCAT entrance test.

Online MDCAT Biological Molecules Quiz with Answers

• Which one of the following graphs shows how the rate of reaction of pepsin is affected by pH?
• Secondary structure of protein is found in
• Phosphoric acid can form with the OH group of pentose sugar
• NAD is an important
• A common carbohydrate composed of glucose and fructose joined by a linkage between C-1 of glucose and C-2 of fructose is
• The DNA of an elephant and the DNA of a cherry tree will probably differ in all of the following respects except the
• The sugar component of the DNA molecule has an empirical formula
• All proteins contain
• ———————— Arises only when a protein consists of two or more polypeptide chains
• The two-dimensional shape of tRNA is
• In beta glucose, the hydroxyl group at the anomeric carbon is present at —————
• The end products of translation are
• Backbone of DNA and RNA
• Inhibition of succinic dehydrogenase by malonate is an example of
• A dipeptides have
• Number of carbon atoms in monosaccharides called heptoses are
• During the course of analyzing an unknown chemical, a chemist determines that the chemical is composed of carbon, hydrogen, and oxygen in the proportion of 1 carbon to 2 hydrogen to 1 oxygen. The chemical is probably
• An amino acid has a minimum of —————- carbon atoms and —————- nitrogen atoms
• Distance between base units of DNA is
• On which of the following molecules would you find codons?

Try Zoology Quiz with Answers