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. Proteins
- B. Carbohydrates
- C. Lipids
- D. Nucleic acids
Explanation: Nucleic acids are not called "food factors" because they are not used for energy or building tissues.
Correct answer: Nucleic acids1322. The enzyme that catalyze the transfer of groups within molecules to yield isomeric forms is called:
- A. Lyase
- B. Ligase
- C. Hydrolase
- D. Isomerase
Explanation: Isomerase enzymes catalyze the rearrangement of atoms within molecules.
Correct answer: Isomerase- A. Muscles
- B. Red blood cells
- C. Tendons
- D. Blood plasma
Explanation: Collagen is the most abundant protein in the body, making up about 30% of all protein.
Correct answer: Tendons- A. Acid halides
- B. Acid carbonyls
- C. Esters
- D. Acid amides
Explanation: Esters are the most common type of carboxylic acid derivative used as flavoring agents.
Correct answer: Esters- A. Formic acid
- B. Acetic acid
- C. Benzoic acid
- D. Amino acid
Explanation: Acetic acid is a colorless, clear liquid with a strong sour smell. It is also known as ethanoic acid or vinegar acid.
Correct answer: Acetic acid- A. Small sizes
- B. Polarity of C-O bond
- C. H-bonding
- D. Dipole-dipole interactions
Explanation: The primary factor that contributes to the formation of carboxylic acid dimers is hydrogen bonding.
Correct answer: H-bonding- A. Alcohol
- B. Aldehyde
- C. Ketone
- D. All of these
Explanation: The oxidation of alcohols, aldehydes, and ketones can form carboxylic acids.
Correct answer: All of these- A. Oxalic acid
- B. Methanoic acid
- C. Glutaric acid
- D. Adipic acid
Explanation: A monocarboxylic acid only has 1 carboxyl group. Methanoic acid has only 1 carboxyl group.
Correct answer: Methanoic acid- A. Apples
- B. Butter
- C. Ant's sting
- D. Foam
Explanation: Formic acid is obtained from ants sting. It is a colorless, pungent liquid that is the simplest carboxylic acid.
Correct answer: Ant's sting- A. Concentration of products
- B. Time
- C. Concentration of substrate
- D. Concentration of solvent
Explanation: The rate of enzyme action is directly proportional to the concentration of the substrate.
Correct answer: Concentration of substrate- A. Hexokinase
- B. Glucose kinase
- C. Fructose kinase
- D. Malonic acid
Explanation: The enzyme that catalyzes the conversion of hexoses to 6-phosphate derivatives is hexokinase.
Correct answer: Hexokinase- A. Aldehydes
- B. Ketones
- C. Carboxylic acids
- D. Alcohols
Explanation: The compounds having the -COOH group are called carboxylic acids.
Correct answer: Carboxylic acids- A. Salt + water
- B. Salt
- C. Salt + H2 gas
- D. Salt + Alcohol
Explanation: When metals react with carboxylic acids, they produce salts and hydrogen gas.
Correct answer: Salt + H2 gas- A. Acetic acid
- B. Butyric acid
- C. Propanoic acid
- D. All of these
Explanation: Formic acid is used as a coagulant for latex in the rubber industry.
Correct answer: Acetic acid- A. Cardiac
- B. Epithelial
- C. Connective
- D. Epidermis
Explanation: Connective tissues are the tissues that bind and support other tissues in the body.
Correct answer: Connective- A. Two dimensional
- B. Unidimensional
- C. Three dimensional
- D. None of these
Explanation: Proteins are three-dimensional in structure. This means that they have a complex shape that is determined by the sequence of amino acids…
Correct answer: Three dimensional- A. Oxidoreductase
- B. Hydrolases
- C. Ligases
- D. Transferases
Explanation: Explanation for this question will be added soon!
Correct answer: Transferases- A. Three
- B. Two
- C. Five
- D. One
Explanation: Explanation for this question has been added!
Correct answer: Two- A. Carbolic acid
- B. H2O
- C. Methanol
- D. Formic acid
Explanation: Explanation for this question has been added!
Correct answer: Formic acid- A. Butanoic acid
- B. Hexanedioic acid
- C. Phthalic acid
- D. Acetic acid
- E. both A and D
Explanation: Explanation for this question has been added!
Correct answer: both A and D