Free Biological Molecules MCQs with Answers
1,790 Biological Molecules MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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- A. A
- B. B
- C. K
- D. D
Explanation: The explanation for this question will be added soon.
Correct answer: K- A. Solid
- B. Liquid
- C. Gas
- D. Plasma
Explanation: Option A is correct since animal fats most commonly include, saturated fats that have a high melting point, and are solids at room…
Correct answer: Solid- A. Waxes
- B. Fats
- C. Both Options A and B are correct
- D. None of these options are correct
Explanation: Esters of fatty acids with higher alcohols other than glycerol are said to be waxes.
Correct answer: Waxes- A. Glycogen
- B. Starch
- C. Fat
- D. Cholesterol
Explanation: Fat, or adipose tissue, is the molecule used by most animals for long-term energy storage.
Correct answer: Fat- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Triglyceride being non-polar do not dissolve in water. They store a lot of energy in them and are hydrolysed to release water.
Correct answer: Option A- A. As insulating material
- B. Providing more energy
- C. As exoskeleton
- D. As cuticle of leaves
Explanation: Lipids are an energy-rich macromolecule, and the carbon-hydrogen bonds in lipids store a lot of energy.
Correct answer: Providing more energy- A. High proportion of oxygen
- B. High C-O ratio
- C. Low proportion of Carbon
- D. High proportion of C-H
Explanation: The normal oxidative process yields approximately 9 kcal per gram of fats, and approximately 4 kcal per gram for carbohydrates.
Correct answer: High proportion of C-H- A. Saponification number
- B. Saponification
- C. Both Options A and B are correct
- D. None of these options are correct
Explanation: Saponification is a process involving the hydrolysis of fats on its reaction with alkali, thereby leading to the formation of salts of…
Correct answer: Saponification- A. Waxes
- B. Fats
- C. Both A and B
- D. None of these
Explanation: Fats (acylglycerol) are esters of fatty acids and glycerol.Natural waxes are esters of long-chain fatty acids and long-chain alcohols.
Correct answer: Waxes- A. Acetic acid
- B. Oleic acid
- C. Palmitic acid
- D. All of these options are correct
Explanation: Palmitic acid is a saturated fatty acid (thus it has a high melting point) and is also soluble in organic solvents.
Correct answer: Palmitic acid- A. Hydrophilic Carbohydrates
- B. Hydrophobic fats
- C. Both a and b
- D. None of these
Explanation: Option A : Carbohydrate groups are present only on the outer surface of the plasma membrane and are attached to proteins, forming…
Correct answer: Both a and b- A. Animals
- B. Plants
- C. Both
- D. None of these
Explanation: Carotenoids perform a protective function in plants. They act as pigments and antioxidants, helping to protect plant cells from damage…
Correct answer: Both1613. Cholesterol is:
- A. Animal sterol
- B. C27H46O
- C. 5 methyl groups
- D. All of these
Explanation: Cholestrol is an animal sterol which the structure shown below indicating the presence of 5 methyl groups and the molecular formula C27H46O.
Correct answer: All of these- A. C26
- B. C25
- C. C30
- D. C28
Explanation: Fatty acids in acylglycerols contain carbon atoms in even numbers. C25 is the only one with an odd number of carbons.
Correct answer: C25- A. Lipotropism
- B. Blood cloting factors
- C. Used for energy production
- D. None of these
Explanation: Essential fatty acids are used as blood clotting factors and energy production.
Correct answer: Lipotropism- A. C-C
- B. C-H
- C. C-N
- D. C-O
Explanation: C-H bond has a high bond energy so it breaks to give a lot of energy; thus, lipids due to thor long fatty acid chains have higher energy…
Correct answer: C-H- A. DNA
- B. RNA
- C. ATP
- D. Triglycerides
Explanation: In triglycerides, 3 fatty acid chains form ester bonds with a glycerol molecule which has 3 alcohol groups.
Correct answer: Triglycerides- A. neutral lipid
- B. natural lipid
- C. wax
- D. all of these
Explanation: Neutral lipids are called so because the have no charge as they do not contain acidic or basic groups.
Correct answer: neutral lipid1619. Lipids have great functional significance in the human body. What are the main functions of lipids?
- A. Energy source
- B. Structure of membrane
- C. Mechanical protection
- D. All of these options are correct
Explanation: Lipids function as an energy reserve, regulate hormones, membrane lipid layer formation, transmit nerve impulses, cushion vital organs…
Correct answer: All of these options are correct- A. Esterified cholesterol
- B. Glycerophospholipids
- C. Triglycerides
- D. Sphingolipids
Explanation: Correct option is C. Lipids are stored in the body in different forms such as, triglycerides, fat cells, cell membranes and lipoproteins.
Correct answer: Triglycerides