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. Glycogen
- B. Cellulose
- C. Starch
- D. Glucose
Explanation: Glucose is the correct answer because it is a monosaccharide, meaning it is a single sugar unit and not a polysaccharide.
Correct answer: Glucose- A. Monosaccharide
- B. Disaccharide
- C. Polysaccharide
- D. All of the above
Explanation: Sucrose is classified as a disaccharide because it is composed of two monosaccharide units: glucose and fructose.
Correct answer: Disaccharide- A. 2 to 8 units
- B. 2 to 9 units
- C. 2 to 10 units
- D. 2 to 11 units
Explanation: Oligosaccharides are carbohydrates composed of 2 to 10 monosaccharide units.
Correct answer: 2 to 10 units- A. Tollen's reagent test
- B. Fehling's solution test
- C. Benedict solution test
- D. All of the above
Explanation: The correct answer is Option D: All of the above. Tollen's reagent test, Fehling's solution test, and Benedict solution test are all used…
Correct answer: All of the above1725. Chitin is a
- A. Lipoprotein
- B. Polysaccharides
- C. Glycoprotein
- D. Phospholipids
Explanation: Chitin is a modified polysaccharide that contains nitrogen. It is a structural carbohydrate found in the exoskeleton of arthropods and the…
Correct answer: Polysaccharides- A. Starch
- B. Cellulose
- C. Sucrose
- D. Glycogen
Explanation: Animal cells store food in the form of glycogen. The excess of glucose in the blood is converted to glycogen in the muscle cells.
Correct answer: Glycogen- A. lonic bond
- B. Hydrogen bond
- C. Peptide bond
- D. Glycosidic bond
Explanation: A glycosidic bond is a type of covalent bond which is formed between two units of monosaccharides
Correct answer: Glycosidic bond- A. Lactose
- B. Maltose
- C. Sucrose
- D. All of the above
Explanation: Maltose is composed of two glucose molecules bonded together. In contrast, lactose consists of one glucose molecule and one galactose…
Correct answer: Maltose- A. 1
- B. 2
- C. 5
- D. 6
Explanation: The ketone functional group in fructose is located on carbon number 2.In fructose, a monosaccharide, the functional group ketone…
Correct answer: 2- A. Monosaccharides
- B. Disaccharides
- C. Oligosaccharides
- D. Polysaccharides
Explanation: Glucose is a simple sugar, also known as a monosaccharide, which means it cannot be broken down into simpler sugars.
Correct answer: Monosaccharides- A. AMP
- B. ATP
- C. ADP
- D. FAD
Explanation: A nucleotide is an organic molecule that is composed of a nitrogenous base, a five-carbon sugar, and a phosphate group.
Correct answer: FAD- A. Trivirates
- B. Triumvirates
- C. Trisvirates
- D. All of the above
Explanation: The correct answer is 'Triumvirates.' This term is used to describe a powerful group of three, which in this context applies to the three…
Correct answer: Triumvirates- A. Decarboxylation
- B. Hydration
- C. Dehydration
- D. Hydrolysis
Explanation: Condensation reactions involve the combination of two molecules to form a new molecule, often with the loss of a small molecule like water…
Correct answer: Hydrolysis- A. Haemocyonin
- B. Haemoprotein
- C. Myoglobin
- D. Haemorrhoids
Explanation: A coiled haemoglobin is referred to as 'Haemoprotein' because haemoglobin is a type of haemoprotein.
Correct answer: Haemoprotein- A. Magnesium
- B. Sodium
- C. Iron
- D. Potassium
Explanation: Hemoglobin is a protein in red blood cells responsible for oxygen transport.
Correct answer: Iron- A. Secreted proteins
- B. Blood clotting factors
- C. Antibodies
- D. All of the above
Explanation: The correct answer is All of the above because oligosaccharides are involved in the modification and functionality of secreted proteins…
Correct answer: All of the above- A. Lipoprotein
- B. Nucleoprotein
- C. Glycolipid
- D. Glycoprotein
Explanation: Option D is correct.The conjugated molecule that is primarily present in egg albumin is glycoprotein.
Correct answer: Glycoprotein- A. Vitamins
- B. Amino acids
- C. Nucleotides
- D. Sugar
Explanation: NAD (Nicotinamide adenine dinucleotide) is a coenzyme that plays a central role in various cellular processes, including energy…
Correct answer: Nucleotides- A. Phospholipids
- B. Cellulose
- C. Cholesterol
- D. Vitamin A
Explanation: Cellulose has no double bonds. Cholesterol and Retinol (vitamin A) have double bonds.
Correct answer: Cellulose- A. Some hormones
- B. Enzymes
- C. Skin terdons
- D. insulin
Explanation: Steroid hormones are derived from lipids. They include testosterone, estrogen, and cortisol, among others.
Correct answer: Some hormones