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. Maltose
- B. Sucrose
- C. Lactose
- D. All of these
Explanation: The most physiologically significant disaccharides are maltose, sucrose, and lactose.
Correct answer: All of these- A. Fats
- B. Glycogen
- C. Amino acids
- D. DNA
Explanation: When blood glucose levels decrease, the body can break down glycogen stored in the liver and muscles into glucose through a process called…
Correct answer: Glycogen- A. 2 to 10
- B. 6
- C. 20
- D. 1
Explanation: Oligosaccharides are carbohydrates that yield between two and ten monosaccharide units upon hydrolysis.
Correct answer: 2 to 10- A. Brain
- B. Heart
- C. Blood
- D. Muscle Tissues
Explanation: Glycogen is a form of stored glucose in the body, primarily found in the liver and muscle tissues.
Correct answer: Blood- A. Glucose
- B. Galactose
- C. Fructose
- D. Ribose
Explanation: Glycogen is a storage form of glucose primarily found in the liver and muscle tissues.
Correct answer: Glucose- A. Polysaccharides
- B. Monosaccharides
- C. Oligosaccharides
- D. Sucrose
Explanation: The correct answer is monosaccharides. Monosaccharides, such as glucose and fructose, are the simplest form of carbohydrates and cannot be…
Correct answer: Monosaccharides- A. Phosphodiester bond
- B. Peptide bond
- C. Ionic bond
- D. Glycosidic bond
Explanation: The correct answer is the glycosidic bond, which is the covalent bond that forms between two monosaccharide subunits, allowing them to…
Correct answer: Glycosidic bond- A. Green vegetables
- B. Grapes
- C. Rice
- D. All of these
Explanation: Green vegetables, such as spinach, kale, and broccoli, are excellent for diabetic control because they are low in carbohydrates and sugar…
Correct answer: Green vegetables- A. Grains
- B. Fruits and tubers
- C. Seeds
- D. All of the above
Explanation: The correct answer is all of these. Grains, fruits, tubers, and seeds all contain starch, though the concentration and prominence as a…
Correct answer: All of the above1070. Table sugar consists of:
- A. Lactose
- B. Sucrose
- C. Glucose
- D. Maltose
Explanation: Table sugar is chemically known as sucrose, which is a disaccharide made from one molecule of glucose and one molecule of fructose.
Correct answer: Sucrose- A. Cellulose
- B. Galactose
- C. Sucrose
- D. Starch
Explanation: In plant cells, excess glucose is primarily stored as starch, which is a polysaccharide. This allows plants to store energy for later use.
Correct answer: Starch- A. Lactose
- B. Sucrose
- C. Glucose
- D. Fructose
Explanation: The correct answer is lactose, which is not typically found in plants. Lactose is a sugar found in milk, produced by mammals, and is not a…
Correct answer: Lactose- A. Iodine test
- B. Benedict's test
- C. Biuret test
- D. Sudan III test
Explanation: Among the listed tests, only the iodine test detects starch by producing a blue-black colour.
Correct answer: Iodine test- A. Nucleic acids
- B. Actin filaments
- C. Lipids
- D. Carbohydrates
Explanation: Carbohydrates are the correct answer because they are often referred to as 'carbon-water' molecules due to their chemical composition.
Correct answer: Carbohydrates- A. Chitin
- B. Starch
- C. Cellulose
- D. Glycogen
Explanation: Cellulose is the correct answer because it is the most abundant organic polymer on Earth.
Correct answer: Cellulose- A. Glycosidic bond
- B. Peptide bond
- C. Ester bond
- D. Hydrogen bond
Explanation: The correct answer is a glycosidic bond. This is the type of covalent bond that specifically forms between two monosaccharides in…
Correct answer: Glycosidic bond- A. Amino group
- B. Hydrogen atom
- C. Carboxyl group
- D. Hydroxyl group
Explanation: Monosaccharides are the simplest form of carbohydrates and typically contain multiple hydroxyl groups.
Correct answer: Hydroxyl group- A. Glucose
- B. Fructose
- C. Mannose
- D. Ribose
Explanation: Cellulose is a polysaccharide that consists of long chains of glucose molecules.
Correct answer: Glucose- A. 1,4
- B. 1,6
- C. Both 1,4 and 1,6
- D. 1,2
Explanation: Glycogen is a highly branched polysaccharide that serves as a form of energy storage in animals and fungi.
Correct answer: Both 1,4 and 1,6- A. It is a stored form of glucose
- B. In glycogen, the right end is reducing and the left end is non-reducing
- C. It is a branched polymer of glucose
- D. It is a stored form of glucose in plants
Explanation: The correct answer is Option D: 'It is a stored form of glucose in plants.' This statement is incorrect because glycogen is the storage…
Correct answer: It is a stored form of glucose in plants