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. Bathochromic group
- B. Hypsochromic groups
- C. Chromogens
- D. All the above
Explanation: Deepening of compounds colour is due to bathochromic groups, because in presence of these groups bathochromic shift (Shifting of different…
Correct answer: Bathochromic group- A. Para
- B. Meta
- C. Ortho
- D. None
Explanation: Auxochrome does not deepens the colour of a chromogen if it is present at meta position relative to chromophore because meta position is…
Correct answer: Meta- A. Troposphere
- B. Thermosphere
- C. Mesosphere
- D. Stratosphere
Explanation: Ozone is present in stratosphere and protect us from harmful ultraviolet radiations.
Correct answer: Stratosphere- A. Organic waste into drinking water
- B. Oil spill in water
- C. Industrial waste mercury into fishing water
- D. Arsenic into the atmosphere
Explanation: Since the discovery of the disease, investigation of the cause has been made, and finally in 1968, the government announced its opinion…
Correct answer: Industrial waste mercury into fishing water- A. Photochemistry
- B. Sonochemistry
- C. Nuclear chemistry
- D. Biochemistry
Explanation: Under the green chemistry such chemical products are designed that can reduce the use or production of hazardous substances.
Correct answer: Nuclear chemistry- A. Sedatives
- B. Antiseptics
- C. Antipyretic
- D. Antidepressant
Explanation: Antipyretics are drugs that help reduce fever. Common examples include acetaminophen (paracetamol) and nonsteroidal anti-inflammatory…
Correct answer: Antipyretic- A. Sodium stearate
- B. Sodium stearoyl lactylate
- C. Sodium acetate
- D. Sodium benzoate
Explanation: Sodium stearate is a salt of stearic acid, which is a fatty acid. It is a common ingredient in soap and is often used as a surfactant…
Correct answer: Sodium stearate- A. Esterification
- B. Saponification
- C. Acetylation
- D. Carboxylation
Explanation: The alkaline hydrolysis of oils and fats is called Saponification. The ester, on treating with a base such as NaOH is converted back to…
Correct answer: Saponification- A. Palmitic acid
- B. Stearic acid
- C. Lauric acid
- D. Benzoic acid
Explanation: Benzoic acid is not typically used in soap preparation.It is an aromatic carboxylic acid and is not a common ingredient in traditional…
Correct answer: Benzoic acid- A. Both are fatty acids having same number of carbon atoms
- B. Both are saturated fatty acids
- C. One olefinic bond is present in oleic acid
- D. The alkyl group of stearic acid contains 38 hydrogen atoms
Explanation: Stearic acid is a saturated fatty acid, as it contains no double bonds in its hydrocarbon chain.
Correct answer: Both are saturated fatty acids- A. It is a drying oil
- B. It is used in paints and varnishes
- C. It is a vegetable oil
- D. All of these are correct
Explanation: Upon review, all the statements (a, b, and c) individually appear to be accurate descriptions of linseed oil.
Correct answer: All of these are correct- A. Stearic acid
- B. Octadecyl alcohol
- C. Tricarboxylic acid
- D. Heptadecyl alcohol
Explanation: Hydrogenolysis of tristearin involves breaking the ester bonds between glycerol and the stearic acid chains.
Correct answer: Octadecyl alcohol- A. Oleic acid
- B. Glycerol
- C. Stearic acid
- D. Tristearin
Explanation: Hydrogenolysis is a chemical reaction that involves the cleavage or breaking of chemical bonds in a molecule using hydrogen gas (H2) in…
Correct answer: Tristearin- A. Glycerol tristearate
- B. Cetyl palmitate
- C. Melissylcerotate
- D. Melissyl palmitate
Explanation: Glycerol tristearate is a white microfine crystalline powder whereas all others are white waxy solids.
Correct answer: Glycerol tristearate- A. A and C
- B. A and B
- C. B and C
- D. B and D
Explanation: Linoleic acid and arachidonic acid are polyunsaturated omega-6 fatty acid whereas palmitic acid and stearic acid are saturated fatty acids…
Correct answer: A and B- A. Trimethylcerylammonium bromide
- B. Sodium lauryl sulphonate
- C. Pentaerythritolmonostearate
- D. Sodium cetylsulphate
Explanation: Pentaerythritolmonostearate(C23H46O5) is an example of a non-ionic detergent.
Correct answer: Pentaerythritolmonostearate- A. Surface active
- B. Surface inactive
- C. Water soluble
- D. Water insoluble
Explanation: Soaps and detergents are surface-active agents, also known as surfactants.
Correct answer: Surface active- A. Wool wax
- B. Carnauba wax
- C. Beeswax
- D. Spermaceti wax
Explanation: Carnauba wax is a natural wax obtained from the leaves of the Copernicia prunifera palm plant.This plant is found only in Brazil so it is…
Correct answer: Carnauba wax- A. CH3O2
- B. Hydrazine
- C. H2 and O2
- D. All of these
Explanation: Monopropellants are substances used in rocket propulsion that decompose or react without needing an additional oxidizer to produce…
Correct answer: Hydrazine1260. Paracetamol contains:
- A. -OH and -NHCHO groups
- B. -OH and -NHCH2 groups
- C. --NHCO CH3 and -SO2NH2 group
- D. -OH and -NHCOCH3 groups
Explanation: Paracetamol contains a hydroxyl group (-OH) and an amide group (-NHCOCH3), which is also referred to as the acetamide group.
Correct answer: -OH and -NHCOCH3 groups