All Free Biology MCQs with Answers
Every Biology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
19,844 questions · page 914 of 993
- A. Four 6-C rings
- B. Three 6-C rings and two 5-C rings
- C. Three 6-C rings and one 5-C ring
- D. Three 6-C rings only
- E. Two 6-C rings and one 5-C ring
Explanation: Explanation for this question will be added soon.
Correct answer: Three 6-C rings and one 5-C ring- 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: Both18274. 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 lipid18280. 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