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. Starch
- B. Glycogen
- C. Cellulose
- D. All of them
Explanation: Cellulose yields glucose through a process called hydrolysis, where the bonds between glucose units are broken.
Correct answer: All of them- A. Peptide bonds
- B. Hydrogen bonds
- C. Disulphide bonds
- D. Glycosidic bonds
Explanation: The two chains of insulin are held together by disulphide bonds, which form covalent links between sulfur atoms in cysteine residues of…
Correct answer: Disulphide bonds- A. Disulphide bonds
- B. Hydrogen bonds
- C. Hydrophobic interactions
- D. Peptide bonds
Explanation: The primary structure of proteins is defined by the linear sequence of amino acids, which are linked by peptide bonds.
Correct answer: Peptide bonds- A. Ionic bond
- B. Peptide bond
- C. Hydrogen bond
- D. Disulfide bond
Explanation: The secondary structure of proteins, such as the alpha helix, is stabilized by hydrogen bonds.
Correct answer: Hydrogen bond- A. Ionic bonds
- B. Hydrogen bonds
- C. Disulfide bonds
- D. Hydrophobic interactions
Explanation: The most stable tertiary configuration in proteins is primarily due to disulfide bonds.
Correct answer: Disulfide bonds- A. Golgi Apparatus
- B. Ribosome
- C. Mitochondria
- D. DNA of a gene
Explanation: The correct answer is Ribosome. Ribosomes are vital cellular organelles that facilitate the synthesis of proteins by translating the…
Correct answer: Ribosome- A. Water has high specific heat
- B. Water has high heat of vaporization
- C. Water is not a universal solvent
- D. Water exhibits strong cohesion tension
Explanation: The correct answer is Option C: Water is not a universal solvent. While water is capable of dissolving many polar and ionic substances due…
Correct answer: Water is not a universal solvent1488. The formation of a large molecule from two small molecules with the removal of water is called:
- A. A: Condensation
- B. B: Hydrolysis
- C. C: Dehydration synthesis
- D. D: Both A and C
Explanation: The correct answer is D: Both A and C. Dehydration synthesis and condensation are two terms for the process of forming a large molecule…
Correct answer: D: Both A and C- A. Globular proteins
- B. Intermediate proteins
- C. Fibrous Proteins
- D. Integral proteins
Explanation: Actin and myosin are classified as fibrous proteins because of their elongated filamentous structure, which is crucial for their role in…
Correct answer: Fibrous Proteins- A. I. Phosphate; II. Ribose; III. Nitrogenous base
- B. I. Phosphate; II. Nitrogen base; III. Ribose
- C. I. Nitrogenous base; II. Phosphate; III. Ribose
- D. I. Ribose; II. Nitrogen base; III. Phosphate
Explanation: The correct answer is Option A: I. Phosphate; II. Ribose; III. Nitrogenous base.
Correct answer: I. Phosphate; II. Ribose; III. Nitrogenous base- A. Water
- B. Carbohydrates
- C. Lipids
- D. Proteins
Explanation: Water is essential for life and participates in numerous biological processes, including digestion, circulation, and chemical reactions.
Correct answer: Water1492. Liposomes are:
- A. Drug carriers
- B. Water in middle
- C. Sac of phospholipids
- D. ALL A, B, C
Explanation: Liposomes are spherical vesicles that act as drug carriers, containing water in their central core surrounded by a lipid bilayer.
Correct answer: ALL A, B, C- A. Hydrogen bonding
- B. Peptide bond
- C. Disulfide bond
- D. Both A and B
Explanation: Proteins with a secondary structure have both hydrogen bonding and peptide bonds as essential elements of their stability and…
Correct answer: Both A and B- A. High proprortion of oxygen
- B. Low proportion of carbon
- C. Lower proportion of C-H bond
- D. High proportion of C-H
Explanation: Option D is correct. Yes, that is correct. Lipids contain more energy than carbohydrates because they have a higher proportion of…
Correct answer: High proportion of C-H- A. Three groups
- B. Seven groups
- C. Three to seven groups
- D. More than seven groups
Explanation: Monosaccharides, Oligosaccharides and polysaccharides as per text book.
Correct answer: Three groups- A. (CH2O)n
- B. Cn(H2O)y
- C. Cn(H2O)n
- D. Cy(H2O)n
Explanation: These are hydrated carbons i.e. having a water molecule against each carbon.
Correct answer: Cn(H2O)n- A. Saccharolipids or sphingolipids
- B. Glycerolipids or polyketides
- C. Triglycerides or neutral lipids
- D. Isoprene or neutral lipids
Explanation: Correct option: C) Triacylglycerols are also called triglycerides or neutral lipids.
Correct answer: Triglycerides or neutral lipids- A. No double bond
- B. One the six double bonds
- C. Low melting point
- D. Part of plant fats
Explanation: Correct option: A) No double bond does not belong to unsaturated fatty acids.
Correct answer: No double bond- A. 61.3oC
- B. 63.1oC
- C. 80oC
- D. -8oC
Explanation: Correct option: B) The melting point of palmitic acid is approximately 63.1°C.
Correct answer: 63.1oC- A. Animal
- B. Plant
- C. All
- D. None
Explanation: Animal fatty acids are saturated fatty acids and have higher melting points. Hence they are solid at room temperature.
Correct answer: Animal