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.
Last updated
1,790 questions · page 49 of 90
- A. Cellulose is a polysaccharide consisting of a linear chain of several hundred to many thousands of β(1→4) linked D-glucose units
- B. Cellulose is a branched polysaccharide that serves as a storage form of energy in animals
- C. Cellulose is a protein that acts as an enzyme to break down starch
- D. Cellulose consists of α(1→4) linked glucose units, similar to amylose starch
Explanation: Cellulose is a complex carbohydrate or polysaccharide that consists of long chains of β(1→4) linked D-glucose units, forming an…
Correct answer: Cellulose is a polysaccharide consisting of a linear chain of several hundred to many thousands of β(1→4) linked D-glucose units- A. Fatty acids, Polysaccharides
- B. Proteins, Amino acids
- C. Lipids, Glucose
- D. None of these
Explanation: In catabolic reactions, proteins are broken down into amino acids. Proteins are large biomolecules consisting of one or more long chains…
Correct answer: Proteins, Amino acids- A. Oxygen
- B. Carbon
- C. Hydrogen
- D. All of these
Explanation: Carbon is the fundamental element found in all organic compounds. Its ability to form four covalent bonds allows for the creation of…
Correct answer: Carbon- A. 774 Kcal/kg
- B. 874 Kcal/kg
- C. 574 Kcal/kg
- D. 674 Kcal/kg
Explanation: The specific heat of vaporization of water is 574 kcal/kg, representing the energy needed to convert liquid water into vapor without…
Correct answer: 574 Kcal/kg- A. 50
- B. 80
- C. 85
- D. 90
Explanation: 85 percent of brain cells consist of water. Water is essential for the brain's proper functioning, providing a medium for biochemical…
Correct answer: 85- A. Phospholipid
- B. Polysaccharides
- C. Protein
- D. Both B and C
Explanation: Glycogen is a polysaccharide (carbohydrate) found in muscles and liver. Glycogen belongs to a group of polysaccharide carbohydrates.
Correct answer: Polysaccharides- A. 0.008
- B. 0.0008
- C. 0.018
- D. 0.08
Explanation: In human blood, glucose is typically found at a concentration of about 0.08%.
Correct answer: 0.08- A. Polysaccharides
- B. Monosaccharides
- C. Oligosaccharides
- D. Sucrose
Explanation: Monosaccharides are the simplest form of carbohydrates and are often referred to as simple sugars.
Correct answer: Monosaccharides- A. Cellulose
- B. Agar
- C. Glycogen
- D. Chitin
Explanation: Glycogen is the correct answer as it is the form of energy storage polysaccharide in animals, similar to starch in plants.
Correct answer: Glycogen- A. Fructose
- B. Glucose
- C. Sucrose
- D. All are monosaccharides
Explanation: The correct answer is Sucrose. Sucrose is a disaccharide, meaning it consists of two monosaccharide units: glucose and fructose.
Correct answer: Sucrose- A. Sugar cane
- B. Milk
- C. Almonds
- D. None of these
Explanation: Sucrose is a disaccharide composed of glucose and fructose, commonly found in sugar cane and sugar beet.
Correct answer: Sugar cane- A. Green vegetables
- B. Grapes
- C. Rice
- D. All of these
Explanation: Green vegetables are valuable for diabetic control because they are low in carbohydrates and high in dietary fiber, which helps stabilize…
Correct answer: Green vegetables- A. Liver
- B. Muscles
- C. Kidneys
- D. Both A and B
Explanation: The correct answer is that glycogen is most abundantly present in both the liver and muscles.
Correct answer: Both A and B- A. Starch
- B. Glycogen
- C. Amylose
- D. Amylopectin
Explanation: The correct answer is amylose, as it is the only option that is soluble in hot water.
Correct answer: Amylose- A. Dextrose
- B. Lymph sugar
- C. Grape sugar
- D. Both A and C
Explanation: Glucose is also known as both dextrose and grape sugar, making Option D correct.
Correct answer: Both A and C- A. Monosaccharides
- B. Carbon atoms
- C. Amino acids
- D. Fatty acids
Explanation: The correct answer is that a glycosidic bond is present between monosaccharides.
Correct answer: Monosaccharides- A. Mannose
- B. Galactose
- C. Maltose
- D. Raffinose
Explanation: The correct option is D. Raffinose is a trisaccharide, which means it is composed of three sugar units: glucose, galactose, and fructose.
Correct answer: Raffinose- A. Glucose
- B. Galactose
- C. Fructose
- D. Ribose
Explanation: Glycogen is a storage form of energy in animals and is made up of repeating glucose units linked by a-1,4-glycosidic and a-1,6-glycosidic…
Correct answer: Glucose- A. ATP
- B. Amino acid
- C. Glucose
- D. All of these
Explanation: Glucose is a simple sugar, a monosaccharide, and is a primary source of energy for cells.
Correct answer: Glucose- A. Lipids
- B. Carbohydrate
- C. Protein
- D. All of these
Explanation: Protein quaternary structure refers to the organization, number, and spatial arrangement of multiple folded protein subunits that assemble…
Correct answer: Protein