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. Dipole nature, Thermo-stabilizer
- B. Polar, Bipolar
- C. Organic, Inorganic
- D. Ionic, Covalent
Explanation: Water is an excellent solvent for polar substances due to its dipole nature.
Correct answer: Dipole nature, Thermo-stabilizer- A. Non-covalent
- B. Ionic
- C. Hydrogen
- D. Hydrophobic
Explanation: Non-covalent: Non-covalent bonds are a class of chemical interactions that do not involve the sharing of electrons between atoms.
Correct answer: Hydrogen- A. Heat capacity
- B. Heat of vaporization
- C. Dipole nature
- D. lonization of water
Explanation: Heat capacity: Heat capacity refers to the amount of heat energy required to raise the temperature of a substance.
Correct answer: Heat of vaporization- A. Specific heat capacity
- B. Cohesion and adhesion
- C. Hydrogen bonding
- D. Hydrophobic exclusion
Explanation: Specific heat capacity: Specific heat capacity refers to the amount of heat energy required to raise the temperature of a substance by a…
Correct answer: Hydrophobic exclusion- A. Heat of vaporization
- B. High polarity
- C. Hydrogen bonding
- D. Cohesion and Adhesion
Explanation: Heat of vaporization: The heat of vaporization is the amount of heat energy required to convert a liquid into a gas at a constant…
Correct answer: High polarity- A. High surface tension
- B. Latent heat of vaporization
- C. High specific heat capacity
- D. Density
Explanation: High surface tension: Surface tension refers to the property of the surface of a liquid that allows it to resist external forces…
Correct answer: High specific heat capacity- A. Low density
- B. Heat of vaporization
- C. Ionization
- D. Hydrophobic exclusion
Explanation: Low density: The correct option is low density. Water is one of the few substances where the solid form (ice) is less dense than the…
Correct answer: Low density- A. Cellulose
- B. Polysaccharides
- C. Starch
- D. Glycogen
Explanation: Cellulose: Cellulose is the most abundant carbohydrate in nature. It is a complex polysaccharide made up of glucose molecules linked…
Correct answer: Cellulose- A. Starch
- B. Cellulose
- C. Glycogen
- D. Chitin
Explanation: Starch: Starch is a polysaccharide composed of glucose units linked together in a branched or helical structure.
Correct answer: Chitin- A. Glucose
- B. Galactose
- C. Fructose
- D. Mannose
Explanation: Glucose: Glucose is a monosaccharide, which means it is a single sugar unit.
Correct answer: Galactose- A. 1
- B. 3
- C. 2
- D. 4
Explanation: 1: This option suggests that the formation of a tri-saccharide involves the release of only one water molecule.
Correct answer: 2- A. Myoglobin
- B. Actin and myosin
- C. Collagen
- D. Glycogen
Explanation: Myoglobin: Myoglobin is a protein found in muscle tissues that is responsible for storing and transporting oxygen within muscle cells.
Correct answer: Glycogen- A. Lactose
- B. Fructose
- C. Sucrose
- D. Maltose
Explanation: Glucose: Glucose is a monosaccharide and an essential source of energy for living organisms.
Correct answer: Fructose- A. 11
- B. 10
- C. 8
- D. 12
Explanation: 11: This option suggests that there are 11 OH groups present in the disaccharide with 12 carbon atoms. However, this is not accurate.
Correct answer: 8- A. Mannose
- B. Sucrose
- C. Maltose
- D. Lactose
Explanation: Mannose: Mannose is a monosaccharide, not a disaccharide. It is a single sugar unit and does not fit the criteria for a non-reducing…
Correct answer: Sucrose- A. Glucose
- B. Sucrose
- C. Fructose
- D. Mannose
Explanation: Glucose: The correct option is glucose. Glucose is the main sugar present in human blood and serves as a primary source of energy for the…
Correct answer: Glucose- A. Glyceraldehyde
- B. Glucose
- C. Dihydroxyacetone
- D. Ribose
Explanation: Glyceraldehyde: Glyceraldehyde is a monosaccharide with three carbon atoms (a triose sugar).
Correct answer: Dihydroxyacetone- A. Monosaccharide
- B. Oligosaccharides
- C. Disaccharides
- D. Polysaccharides
Explanation: Monosaccharide: Monosaccharides are the simplest form of carbohydrates, and they cannot be hydrolyzed into smaller carbohydrates.
Correct answer: Polysaccharides- A. Removal of water
- B. Removal of oxygen
- C. Addition of oxygen
- D. Addition of water
Explanation: Removal of water: The formation of a glycosidic bond involves the removal of a water molecule (H2O) from two hydroxyl groups of…
Correct answer: Removal of water- A. Ionic bond
- B. Hydrogen bond
- C. Peptide bond
- D. Glycosidic bond
Explanation: Ionic bond: An ionic bond is a type of chemical bond that forms between two atoms when one atom donates an electron, becoming positively…
Correct answer: Glycosidic bond