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. Fish
- B. Liver
- C. cow milk
- D. Plants
Explanation: Explanation for this question will be added soon!
Correct answer: cow milk- A. Alkaline phosphatase
- B. Acidic phosphatase
- C. LDH-1
- D. None
Explanation: Explanation for this question will be added soon!
Correct answer: Alkaline phosphatase- A. Formic acid
- B. Acetic acid
- C. Benzoic acid
- D. Amino acid
Explanation: Explanation for this question has been added!
Correct answer: Acetic acid- A. Benzyl acctate
- B. Octyl acctate
- C. Amyl butyrate
- D. Ethyl butyrate
Explanation: Benzyl acetate has Jasmine flavour. Octyl acetate has orange flavour. Amyl butyrate has banana flavour.
Correct answer: Octyl acctate- A. Nitriles, ester
- B. Nitriles, amines
- C. AIkenes, alkynes
- D. Esters, alcohol
Explanation: Explanation for this question has been added!
Correct answer: Nitriles, ester- A. Polarity of carbonyl group
- B. Due to methyl group
- C. Due to H-bonding
- D. Due London forces
Explanation: Explanation for this question has been added!
Correct answer: Due to H-bonding- A. Coagulation
- B. Dehydration
- C. Denaturation
- D. None of these
Explanation: The disruption of protein structure by heating, chemical agents, or other factors is commonly referred to as denaturation.Denaturation…
Correct answer: Denaturation- A. Reducers
- B. Activators
- C. Promotors
- D. Inhibitors
Explanation: Substances that reduce the activity of enzyme action are called enzyme inhibitors.Enzyme inhibitors are molecules that bind to enzymes and…
Correct answer: Inhibitors- A. Carbohydrates
- B. Lipids
- C. Proteins
- D. DNA
Explanation: High molecular mass organic compounds that, upon hydrolysis, yield amino acids are called proteins.Proteins are macromolecules composed of…
Correct answer: Proteins- A. Transport proteins
- B. Structural proteins
- C. Genetic proteins
- D. Regulatory proteins
Explanation: Nucleoproteins are Genetic proteins.Nucleoproteins are complex molecules composed of both nucleic acids (such as DNA or RNA) and proteins.
Correct answer: Genetic proteins- A. CO
- B. CH3COOCH3
- C. CH3CH2COOH
- D. CH3COOCH2CH3
Explanation: The reaction of an alcohol with an acid in the presence of conc. H2SO4 to form an ester is called an esterification reaction.
Correct answer: CH3COOCH2CH3- A. Methyl MgBr reacts with CO2
- B. Isopropyl MgBr reacts with CO2
- C. Ethyl MgBr reacts with CO2
- D. Propyl MgBr reacts with CO2
Explanation: Ethyl magnesium bromide is an organometallic compound that reacts with carbon dioxide (CO2) through a Grignard reaction.
Correct answer: Ethyl MgBr reacts with CO2- A. Decreases with increase of volume
- B. Decreases with increase in molecular mass
- C. Increases with increase in molecular mass
- D. None of these
Explanation: This option is generally correct. The solubility of carboxylic acids tends to decrease as the molecular mass of the carboxylic acid…
Correct answer: Decreases with increase in molecular mass- A. colourless liquid, has odour, sour taste
- B. Bright colour bitter taste
- C. Colourless solid, sour taste. pungent smell
- D. All are incorrect
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Correct answer: colourless liquid, has odour, sour taste- A. Acctic acid
- B. Bitter
- C. Citric
- D. Vinegar
Explanation: Explanation for this question will be added soon!
Correct answer: Vinegar- A. Dehydration reaction
- B. Condensation reaction
- C. Both A and B
- D. None of these
Explanation: The explanation for this question has been added!
Correct answer: Both A and B- A. Co-enzyme
- B. Co-factor
- C. Apoenzyme
- D. Prosthetic group
Explanation: Explanation for this question will be added soon!
Correct answer: Apoenzyme- A. Activator
- B. Coenzyme
- C. Co-factor
- D. Both A and B
Explanation: Explanation for this question will be added soon!
Correct answer: Both A and B- A. HCI
- B. H2SO4
- C. CH3COOH
- D. H3PO4
Explanation: Explanation for this question will be added soon!
Correct answer: CH3COOH- A. Lyases
- B. Hydrolases
- C. Ligases
- D. Transferase
Explanation: Explanation for this question will be added soon!
Correct answer: Lyases