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 61 of 90
- A. Toys
- B. Gramophone recorders
- C. Compact discs
- D. Emulsion paints
Explanation: PVA is used in sizing agents that give greater strength to textile yarns and make paper more resistant to oils and greases.
Correct answer: Emulsion paints- A. Condensation polymer
- B. Addition polymer
- C. Biopolymer
- D. Thermosetting polymer
Explanation: Polyvinyl chloride is an example of an addition polymer. It is formed by the addition polymerization of vinyl chloride monomers.
Correct answer: Addition polymer- A. Hair
- B. Nail
- C. Tendons
- D. Arteries
Explanation: Collagen is most abundantly found in tendons. Tendons are fibrous connective tissues that connects muscles to bones, providing strength…
Correct answer: Tendons- A. Stomach
- B. Mouth
- C. Liver and Muscles
- D. Small intestine
Explanation: Animals store glucose in the form of glycogen. Glycogen is a polysaccharide stored mainly in the liver and skeletal muscles.
Correct answer: Liver and Muscles- A. 1
- B. 2
- C. 4
- D. 6
Explanation: Amino acid leucine is coded by 6 codons UUA, UUG, CUU, CUC, CUA, and CUG.
Correct answer: 6- A. H2O
- B. HCl
- C. NH3
- D. No one is eliminated
Explanation: In polymer chemistry, an additional polymer is a polymer that forms by simple linking of monomers without the co-generation of other…
Correct answer: No one is eliminated- A. Nylon
- B. PVC
- C. Polythene
- D. Both PVC and Polythene
Explanation: In addition polymerization (sometimes called chain-growth polymerization), a chain reaction adds new monomer units to the growing polymer…
Correct answer: Both PVC and Polythene- A. Annealing
- B. Extension
- C. No Annealing
- D. Primer-dimer formation
Explanation: Primer annealing is a critical step in polymerase chain reaction or PCR.
Correct answer: No Annealing- A. Amylose
- B. Cellulose
- C. Glycogen
- D. Glycine
Explanation: Glycogen Is known as animal starch. The animals have polymerized glucose stored in the form of glycogen.
Correct answer: Glycogen- A. Proteins
- B. Vitamins
- C. Lipids
- D. Minerals
Explanation: Enzymes are proteins that help speed up metabolism, or the chemical reactions in our bodies.
Correct answer: Proteins- A. Cytosine
- B. Adenine
- C. Guanine
- D. Thymine
Explanation: Uracil forms a nucleoside with only ribose sugar while thymine forms the same with only deoxyribose sugar. Other nitrogen bases (i.e.
Correct answer: Thymine- A. Mg2+
- B. Al3+
- C. Fe3+
- D. B3+
Explanation: In chlorophyll, the central ion is magnesium, and the large organic molecule is a porphyrin.
Correct answer: Mg2+1213. Which of the following is necessary for the normal development of leaves and bark of the plants?
- A. Sodium
- B. Aluminium
- C. Calcium
- D. Beryllium
Explanation: Calcium plays an important role in producing plant tissues and it enables plants to grow better.
Correct answer: Calcium- A. Glass
- B. Iron
- C. Plastic
- D. copper
Explanation: A polymer is a substance made of many repeating units called monomers. Plastics are formed by many identical repeating monomers thus are…
Correct answer: Plastic- A. Sulfur
- B. Carbon
- C. Nitrogen
- D. Oxygen
Explanation: Chemically, proteins are complex nitrogenous organic compounds, which are associated with the concept of life itself.By chemical…
Correct answer: Nitrogen- A. Catalyst
- B. Lipoproteins
- C. Conjugated molecules
- D. Biocatalyst
Explanation: Enzymes are proteins that catalyze a chemical reaction in our body. They function as a catalyst that speeds up the reaction by lowering…
Correct answer: Biocatalyst- A. Oxidoreductase
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: These enzymes, called transferases, move functional groups from one molecule to another.
Correct answer: Transferases- A. Forms a colloidal solution with water
- B. Is soluble in water
- C. Does not form an emulsion with the grease
- D. Forms an emulsion with the grease
Explanation: Soap has a tadpole like structure, because they possess a long carboxylic acid chain through which hydrocarbons and sodium-pottasium ions…
Correct answer: Does not form an emulsion with the grease- A. Glycerol and gum are added to the soap.
- B. The soap is dissolved in alcohol and then the alcohol is evaporated out.
- C. Glycerine is added to the alcoholic solution of soap.
- D. A saturated solution of sodium chloride is added to the soap.
Explanation: To make the soap transparent firstly soap crystals are processed with solvents like glycerine, alcohol and sugar to dissolve, that…
Correct answer: The soap is dissolved in alcohol and then the alcohol is evaporated out.- A. Increased by both
- B. Reduced by both
- C. Reduced by detergent and increased by soap
- D. Reduced by soap and increased by detergent
Explanation: When soap and detergent are added to the water, the ionic part of soap and detergent attract grease and repel water molecules, thus the…
Correct answer: Reduced by both