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. 9000
- B. Less than 10000
- C. 10000
- D. More than 10000
Explanation: d) More than 10000:This option is the most accurate statement. Proteins typically have molecular masses greater than 10000.
Correct answer: More than 10000- A. Greek, Important.
- B. French, Prime Importance.
- C. Greek, Functional.
- D. Greek, Prime Importance.
Explanation: The name protein is derived from the Greek word "proteios", which means "primary" or "of prime importance".
Correct answer: Greek, Prime Importance.1183. Protein is a polymer of?
- A. Nitrogen atoms.
- B. Amino acids.
- C. Glucose.
- D. Nitrogenous base.
Explanation: Protein is a polymer of amino acids. Amino acids are the monomers that make up proteins, and they are linked together by peptide bonds to…
Correct answer: Amino acids.- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation: Tertiary structure is the compact structure of a protein molecule resulting from the three dimensional coiling of an already folded chain…
Correct answer: Tertiary structure- A. B1
- B. B2
- C. C
- D. B3
Explanation: NAD contains vitamin B3 as a cofactor. A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's role…
Correct answer: B3- A. 60000
- B. 10000
- C. 5000
- D. 200
Explanation: Option B is correct since the human body probably contains at least 10,000 different kinds of proteins.
Correct answer: 10000- A. C-H
- B. N-H
- C. O-H
- D. Cl-H
Explanation: Proteins are made of long chains of amino acids .The long chains of amino acids are coiled around each other into a spiral called helix…
Correct answer: N-H1188. Nucleoprotein are _ proteins which transfer heredity information from one generation to the other.
- A. Transport protein
- B. Structural protein
- C. Genetic protein
- D. Regulatory protein
Explanation: Nucleoproteins which are complexes of protein with nucleic acids serve as carriers of heredity from one generation to another and thus are…
Correct answer: Genetic protein- A. Oxidoreductase
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: This option is correct because hydrolase is the enzyme which catalyses the process of hydrolysis.Hydrolysis is the process in which large…
Correct answer: Hydrolases- A. Invertase
- B. Urease
- C. Glycolysis
- D. Zymase
Explanation: A zymase enzyme present in the yeast is used to convert glucose into ethanol and carbon dioxide.
Correct answer: Zymase- A. Hydrogenolysis
- B. Fermentation
- C. Carboxylation
- D. Saponification
Explanation: Saponification is a process that involves the conversion of fat, oil, or lipid (fats in this case) into soap and alcohol by the action of…
Correct answer: Saponification- A. 7
- B. 8
- C. 6
- D. 4
Explanation: Nylon 6,6 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine, and adipic acid, which give nylon 6,6 its name.
Correct answer: 6- A. Disaccharides
- B. Monosaccharides
- C. Polysaccharides
- D. Starch
Explanation: It consists of one unit of galactose plus one of glucose linked together by β-(1→4) glycosidic bond, then it is a disaccharide.
Correct answer: Disaccharides- A. Monomers
- B. Isomers
- C. Metamers
- D. Tautomers
Explanation: A monomer is a molecule that "can undergo polymerization thereby contributing constitutional units to the essential structure of a…
Correct answer: Monomers- A. Addition
- B. Condensation
- C. Substitution
- D. Pyrolysis
Explanation: Polymerization of ethene involves the addition of many ethene molecules to form a long-chain hydrocarbon called polyethylene.
Correct answer: Addition1196. The ―NH―CO is called:
- A. Amide group
- B. Amino group
- C. Protein linkage
- D. Peptide linkage
Explanation: -NH-CO- is a peptide linkage bond, done when 2 amino acids are joined together.
Correct answer: Peptide linkage- A. Option A`
- B. Option B
- C. Option C
- D. Option D
Explanation: The amino acids having amino and carboxyl group attached to the same carbon, i.e., alpha-carbon atom is called alpha-amino acids.
Correct answer: Option A`- A. Lysine
- B. Proline
- C. Valine
- D. Alanine
Explanation: Lysine has an amino in it's R-group chain i.e.NH2.
Correct answer: Lysine- A. ―NH3+ and COO-
- B. ―NH3 and COO-
- C. ―NH3+ and COOH
- D. ―NH3 and COOH
Explanation: Intermediate value means under neutral conditions. So in that circumstance amino acids produce NH3+ and COO- zwitter ions.
Correct answer: ―NH3+ and COO-- A. Biopolymer
- B. Lipids
- C. Condensation polymer
- D. Addition polymer
Explanation: PolyESTERS (polymers of esters) are mostly made by condensation polymerisation reactions, making them condensation polymers.
Correct answer: Condensation polymer