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. Two
- B. One
- C. Three
- D. Four
Explanation: Polymerization reactions are of two types; condensation and addition polymerization.
Correct answer: Two1142. Polyester is used in:
- A. Cosmetic industry
- B. Fabric industry
- C. None of these
- D. Food industry
Explanation: Polyester is a synthetic fabric made from petroleum. It is one of the most popular textiles.Polyesters are most commonly made by…
Correct answer: Fabric industry- A. Covalent
- B. Ionic
- C. Hydrogen
- D. Metallic
Explanation: Proteins primarily contain covalent bonds which form their primary structure but they also mostly have hydrogen bonding which forms their…
Correct answer: Hydrogen- A. Thrombin
- B. L-asparaginase
- C. Both
- D. None of these
Explanation: L-asparaginase is an enzyme used to fight anti-cancer cells in children. Thrombin is merely a clotting factor.
Correct answer: L-asparaginase- A. Urease
- B. Lipase
- C. Maltase
- D. Protease
Explanation: Option A: Urease is an enzyme that catalyzes the hydrolysis of urea into ammonia and carbon dioxide.
Correct answer: Lipase- A. Transport proteins
- B. Structural proteins
- C. Genetic proteins
- D. Regulatory proteins
Explanation: Option A: Hemoglobin falls under the category of transport proteins. These proteins are responsible for transporting various substances…
Correct answer: Transport proteins- A. Coenzyme
- B. Co-factor
- C. Prosthetic group
- D. None
Explanation: Option A: Coenzymes are small organic molecules that assist enzymes in carrying out specific reactions.
Correct answer: Prosthetic group- A. Rickets
- B. Anaemia
- C. Heart disorders
- D. Stroke
Explanation: LDH-1 (lactate dehydrogenase-1) is an enzyme found in various tissues, including the heart, liver, kidneys, and red blood cells.
Correct answer: Heart disorders- A. Peptide bond
- B. Phosphodiester linkage
- C. H-bonding
- D. Ether linkage
Explanation: The amino acids in proteins are held together by covalent peptide bonds, which are formed through a condensation reaction between the…
Correct answer: Peptide bond- A. Acid halides
- B. Binary compounds
- C. Esters
- D. Alkanes
Explanation: Fatty acids occur as esters of alcohols, rather than as alcohols themselves.
Correct answer: Esters- A. Simple protein
- B. Derived proteins
- C. Conjugated proteins
- D. All of these
Explanation: Simple proteins are composed of only amino acid residues linked together by peptide bonds.
Correct answer: Derived proteins- A. Lyases
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: Lyases, also known as lyases, are a class of enzymes that catalyze the breaking of various chemical bonds in organic molecules, without…
Correct answer: Lyases- A. Animals
- B. Plants
- C. Human beings
- D. None
Explanation: Globulin proteins are found in animals, including humans. Globulins are a class of proteins commonly found in the blood plasma and serve…
Correct answer: Animals- A. Oxidoreductase
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: Enzymes that bring about exchange of functional group are called Transferases.
Correct answer: Transferases- A. Vitamins
- B. DNA
- C. Coenzyme
- D. None of these options are correct
Explanation: OPTION A: Vitamins are considered essential nutrients that are required in small amounts in the diet and are not classified as cofactors…
Correct answer: Coenzyme- A. LDH-1
- B. Protease
- C. Alkaline phosphatase
- D. None of these options is correct
Explanation: Alkaline phosphatase is used for the diagnosis of rickets and obstructive jaundice.
Correct answer: Alkaline phosphatase- A. Carbohydrates
- B. Lipids
- C. Proteins
- D. DNA
Explanation: Option A: A carbohydrate is a naturally occurring compound, or a derivative of such a compound, with the general chemical formula…
Correct answer: Proteins- A. Coagulation
- B. Dehydration
- C. Denaturation
- D. None of these options are correct
Explanation: Option A: Coagulation is defined as the change in the structure of protein (from a liquid form to solid or a thicker liquid) brought about…
Correct answer: Denaturation1159. lsoenzymes comes from _.
- A. Same sources
- B. Different organisms
- C. Same organisms
- D. None of these options are correct
Explanation: Isoenzymes are the enzymes that come from same organism and catalyse the same reaction but are chemically and physically distinct from…
Correct answer: Same organisms- A. Lyases
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: Protease is an enzyme that hydrolyses the protein into amino acids. Hence it is a hydrolases enzyme.
Correct answer: Hydrolases