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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1101. During condensation polymerization, two monomers may be joined by the removal of a molecule of:
- A. Carbon Dioxide
- B. Hydrogen
- C. Oxygen
- D. Water
- E. None of these options
Explanation: During condensation polymerization, two molecules are joined together with the removal of H2O molecules.
Correct answer: Water- A. Allotropy
- B. Electroplating
- C. Collision
- D. Cracking
- E. Corrosion
Explanation: The harmful and desirable reaction which occurs due to oxidation of the metal exposed to the surrounding air is called corrosion.
Correct answer: Corrosion- A. Hydrochloric acid and hydrogen
- B. Hydrogen and sodium
- C. Hydrogen and sodium hydroxide
- D. Sodium and sodium hydroxide
- E. Hydrochloric acid and sodium
Explanation: Gas extraction: Chlorine can be manufactured by the electrolysis of a sodium chloride solution (brine), whichis known as the Chlor Alkali…
Correct answer: Hydrogen and sodium hydroxide- A. C2H4
- B. C2H6
- C. C3H6
- D. C3H8
Explanation: In this process, small organic molecules (monomers) combine together to form larger molecules known as Polymers.
Correct answer: C2H4- A. Acid
- B. Oxidizing agent
- C. Nitrating agent
- D. Dehydrating agent
- E. Sulfonating agent
Explanation: H2SO4 is an acid, oxidizing agent, dehydrating agent, and sulfonating agent. It is not a nitrating agent. The nitrating agent is NO2.
Correct answer: Nitrating agent- A. H2SO4
- B. Ammonia
- C. Methanol
- D. NaOH
- E. Formalin
Explanation: Formalin is one of the preservatives used to preserve biological specimens. Formalin is used for the preservation of biological specimens.
Correct answer: Formalin1107. Which one of the following is the pure carbon compound and used as a reducing agent in industries?
- A. Coal tar
- B. Petroleum
- C. Coal gas
- D. Coke
Explanation: Pure carbon used as a reducing agent in industries. It is also used in the manufacture of iron and steel Industry.
Correct answer: Coke- A. 95%
- B. 90%
- C. 85%
- D. 80%
Explanation: Duralumin is an alloy made up of 90% aluminium, 4% copper, 0.51% magnesium, and less than 1% manganese.
Correct answer: 90%- A. Calcium chloride
- B. Magnesium chloride
- C. Aluminium chloride
- D. Potassium chloride
Explanation: Sodium chloride melts at a very high temperature. A mixture containing(NaCl+CaCl2) is used to decrease the melting point.
Correct answer: Calcium chloride- A. PVA
- B. PVC
- C. Bakelite
- D. Perspex
Explanation: Perspex is a hard, brittle, and clear polymer that is mostly used in packaging materials, bowls, toys, combs, trays, disposable cutlery…
Correct answer: Perspex- A. Zymase
- B. Invertase
- C. Lipase
- D. Diastase
Explanation: Lipase is an enzyme that breaks down lipid molecules. Fermentation does not involve lipid substances to be broken down, hence lipase has…
Correct answer: Lipase- A. Al2O3
- B. P2O5
- C. Dilute H2SO4
- D. H3PO4
Explanation: There is no such reaction in which P2O5 can produce alkenes from alcohol.
Correct answer: P2O5- A. Propionic acid
- B. Stearic acid
- C. Palmitic acid
- D. Formic acid
- E. Acetic acid
Explanation: Stearic acid (IUPAC systematic name: octadecanoic acid is one of the useful types of saturated fatty acids that comes from many animal and…
Correct answer: Stearic acid- A. Lands Berger's method
- B. Fractional crystallization
- C. Beckmann method
- D. None
Explanation: As the solution cools, the solubility of the compound (and of the soluble impurities) decreases, the solution becomes saturated with the…
Correct answer: Fractional crystallization- A. Sodium Chloride
- B. Sodium Carbonate
- C. Limestone
- D. Ammonia gas
Explanation: Sodium carbonate is the product of the Solvay process so it can definitely not be the raw material required for this process.
Correct answer: Sodium Carbonate- A. Precursor of making Teflon
- B. Precursor of making refrigerants
- C. Anaesthetic
- D. Embalming chemicals
Explanation: Chloroform is commonly used to prepare Teflon and refrigerants. It has also been used as an anesthetic in history.
Correct answer: Embalming chemicals- A. Oxidising smog
- B. Neutral smog
- C. Basic smog
- D. Reducing smog
Explanation: Smog is a combination of smoke and fog. There are two types of smog: oxidising and reducing.Oxidising smog is also called photochemical…
Correct answer: Reducing smog- A. CuO + ZnO
- B. CuO + Cr2O3
- C. Al2O3 + ZnO
- D. ZnO + Cr2O3
Explanation: Industrially, the conversion of water gas (a mixture of carbon monoxide and hydrogen) into methanol is typically achieved using a catalyst…
Correct answer: ZnO + Cr2O3- A. Polyester
- B. Epoxy resins
- C. Acrylic resins
- D. Polyamides
Explanation: In 1929, WH Carothers suggested classification of polymers based upon the way polymers are formed.
Correct answer: Acrylic resins- A. Ribose
- B. 2 - deoxyribose
- C. 3 - deoxyribose
- D. 2 - deoxypentose
Explanation: The sugar unit in a DNA molecule is deoxyribose. Deoxyribose is a five-carbon sugar that forms the backbone of the DNA molecule along with…
Correct answer: 2 - deoxyribose