MDCAT MCQs with Answers | Free Practice Tests

Test your MDCAT Biology preparation with this comprehensive Biological Molecules Quiz covering fats, oils, fatty acids, enzymes, coenzymes, cofactors, enzyme inhibition, active sites, pH, and enzyme models. This 20-question MDCAT Biology MCQ quiz is designed to help students practice key concepts in biological molecules and enzymes, which are frequently tested in medical entrance examinations. Challenge yourself, check your understanding, identify weak areas, and improve your MDCAT Biology score through focused practice. Let us start with the Online Biological Molecules Quiz now

Online Biological Molecules Quiz with Answers

1. Fats containing fatty acids are usually liquid at room temperature and are said to be oils
2. Fats containing ————- fatty acids are solid at room temperature
3. Fats containing unsaturated fatty acids are usually represented by
4. —————- fats are solid at room temperature
5. Fats and oils are
6. The specific gravity of fats and oils is
7. The inhibitors that bind tightly and permanently to enzymes and destroy their globular structure and catalytic activity are
8. Enzyme succinate dehydrogenase converts succinate into
9. If the detachable co-factor is an inorganic ion, then it is designated as
10. The view that the active site of an enzyme is flexible and when a substrate combines with it, causes changes in enzyme structure is known as
11. All coenzymes are derived from
12. The optimum pH value for the working of pancreatic lipase is
13. The competitive inhibitors have structural similarity with
14. Which molecular structure of an enzyme is essential for its activity?
15. Some enzymes require a helper, which is a non-protein part, for their efficient functioning; that is called
16. Pepsin, a protein-digesting enzyme, acts best at pH
17. Which one of the following is an example of a competitive inhibitor?
18. An enzyme requires Mg++ to catalyze the substrate. The Mg+ is best identified as
19. The figure represents ————— inhibitor
20. According to ——————– model the active site of the enzyme is modified as the substrate interacts with the enzyme

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Test your MDCAT Biology preparation with this Biological Molecules MDCAT Quiz containing 20 important multiple-choice questions (MCQs). The quiz covers essential concepts related to carbohydrates, lipids, fatty acids, nucleic acids, DNA and RNA, enzymes, enzyme inhibition, phosphodiester bonds, and the structure and properties of biological molecules.

This online Biology quiz is designed for MDCAT students to practice important concepts, identify weak areas, and improve their preparation for the Biology section of the MDCAT exam. Questions include chemical energy in glucose, fatty acids, waxes, nucleotides, purine and pyrimidine bases, DNA structure, enzyme active sites, cofactors, enzyme inhibition, and melting points of fatty acids.

Online Biological Molecules MDCAT Quiz with Answers

1. The chemical energy stored in 10 grams of glucose is
2. These are comparatively less sweet in taste and less soluble in water
3. Waxes are formed by the combination of fatty acids with
4. The combination of a pentose sugar with a base results in a compound known as
5. One of the pyrimidine bases is absent in DNA
6. Which of the follwing combination of base pairs is absent in DNA?
7. Which of the following is a purine?
8. Number of base pairs in one turn of DNA is
9. A phosphodiester bond is
10. An enzyme and substrate react through a special feature or site present in the enzyme known as
11. The non-protein part of an enzyme, which is covalently and permanently bonded, is called
12. Enzymes increase the rate of reaction by
13. The type of inhibition in which the inhibitor has no structural similarity to the substrate and combines with the enzyme at a site other than the active site is called
14. Solubility of fatty acids in organic solvents and their melting points increase with an increase in the
15. —————- is much more soluble in organic solvent than
16. Melting point of palmitic acid is
17. Melting point of butyric acid is
18. The smallest fatty acid is
19. A saturated fatty acid with four carbon atoms is
20. A saturated fatty acid with sixteen carbon atoms is

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Preparing for the MDCAT Biology Quiz? Challenge yourself with this 20-question practice test on Biological Molecules: covering DNA coiling, codon recognition, and sugar rings. Let us start the Online MDCAT Biology Quiz now:

Online MDCAT Biology Quiz: Biological Molecules Practice MCQs with Answers

1. Watson and Francis Crick built ———— model of DNA
2. Nonsense codons are recognized by the
3. Amino acids are arranged according to the information present on
4. Chain length of rRNA molecule is ——————– nucleotide
5. On hydrolysis, oligosaccharides yield —————- monosaccharides
6. Coiling of DNA strands is
7. Which of the following is a disaccharide?
8. Glycogen resembles which of the following?
9. The general formula of carbohydrates is $Cx$ (H20) $y$ where $x$ is the whole number
10. Polyhydroxy aldehydes or ketones are
11. The example of a polyhydroxy ketone is
12. “Complex substances which on hydrolysis yield polyhydroxy aldehyde or ketone subunits” are
13. The sources of carbohydrates are
14. Glucose forms a six-corner ring called
15. —————- corners of ribofuranose are occupied by carbon
16. —————- corners of Glycopyranose are occupied by carbon atoms
17. In the free state, glucose is present in
18. In combined form, glucose is found in
19. Starch, cellulose and glycogen yield on complete hydrolysis
20. Glucose is naturally produced in

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Test your knowledge with 20 high-yield MDCAT Biological Molecules Practice Questions MCQs on Biological Molecules, Enzymes, enzyme inhibition, carbohydrate structures, glycosidic linkages, and Carbohydrates. Boost your MDCAT score with practice quiz questions! Let us start with the online MDCAT Biology Test: Biological Molecules Practice Questions with Answers now:

Online Biological Molecules Practice Questions with Answers

1. A student of chemical engineering mistakenly ingested the toxic compound A, which was a potent inhibitor of a certain enzyme. He was immediately brought to the hospital, where Dr. injected substrate B intravenously to minimize the toxic effect of compound A. His life was saved from serious damage. The treatment method shows that compound A was a ————— inhibitor.
2. If a molecule can bind to another site of the enzyme rather than the true active site, it is referred to as
3. A non-protein part essential for proper and essential functioning of an enzyme is called
4. The temperature that promotes the maximum activity of an enzyme is referred to as
5. The covalent bond formed between two monosaccharides is called
6. The bond formed between glucose and fructose to form sucrose is —————- linkage:
7. Carbohydrates are organic molecules and contain three elements
8. Which ones are intermediates in respiration and photosynthesis both?
9. ————— is the most abundant carbohydrate in nature
10. Which of the following is a keto sugar?
11. The compounds which, on hydrolysis, yield polyhydroxy aldehyde or ketone subunits are
12. Which one of the following is the formula structure of D ($\alpha$) glucose?
13. In an amino acid in which the R-group is hydrogen, the amino acid will be
14. Cellulose of wood, cotton, and paper is an example of
15. The main constituents of cell walls in plants, algae, fungi, and eukaryotic microorganisms are
16. Carbohydrates are composed of
17. In simple carbohydrates, the ratio of hydrogen and oxygen is the same as in
18. The most common respiratory substance as a source of energy is
19. The simplest monosaccharide containing a keto group is
20. Monosaccharides are major components of

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