Free Macromolecules MCQs with Answers
299 Macromolecules MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
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Read the Macromolecules notesFree MDCAT chapter notes with key terms299 questions · page 11 of 15
- A. Glucose
- B. Maltose
- C. Sucrose
- D. Aspartame
Explanation: The artificial sweetener that is 200 times sweeter than sugar and is commonly used as a sugar substitute in foods and soft drinks is…
Correct answer: Aspartame- A. Sucrose
- B. Raffinose
- C. Maltose
- D. Galactose
Explanation: Maltose ia a disaccharide that on hydrolysis gives two units of alpha-glucose.
Correct answer: Maltose- A. Amino acids
- B. Ethers
- C. Esters
- D. Cycloparaffins
Explanation: Protein is a macromolecule formed by amino acid monomers. Proteins on hydrolysis in acidic or basic medium gives amino acid monomers.
Correct answer: Amino acids- A. C1 and C5
- B. C1 and C4
- C. C1 and C3
- D. C3 and C4
Explanation: The ring structure of glucose is due to the formation of a hemiacetal between the aldehyde group at carbon 1 and the hydroxyl group at…
Correct answer: C1 and C5- A. Elevation in boiling point
- B. Relative lowering of vapour pressure
- C. Depression in freezing point
- D. Osmotic pressure method
Explanation: To determine the molecular weight of a protein, a chemist can use various methods such as osmotic pressure method, ultracentrifugation…
Correct answer: Osmotic pressure method- A. Strong base
- B. Strong acid
- C. Weak base
- D. Both strong and weak bases
Explanation: H3PO4 is a dibasic acid, meaning it has two acidic hydrogen atoms that can dissociate in water to form two H+ ions.
Correct answer: Strong base- A. Laevorotatory
- B. Dextrorotatory
- C. Both (a) and (b)
- D. None of the given options are correct
Explanation: The fructose present in honey is laevorotatory because it has an asymmetric carbon atom that rotates the plane of polarized light to the…
Correct answer: Laevorotatory208. During the reduction of sugar through Fehling's solution, the ionic state of metal changes from:
- A. Fe+2 to Fe+3
- B. Fe+3 to Fe+5
- C. Cu+1 to Cu+2
- D. Cu+2 to Cu+1
Explanation: During the reduction of sugar through Fehling's solution, the ionic state of metal changes from Cu²⁺ to Cu₂O.
Correct answer: Cu+2 to Cu+1- A. Carcinogenic
- B. Thermally unstable
- C. 300-400 times sweeter than sugar
- D. All of these options are correct
Explanation: Benzoic sulfimide which is also known as sodium saccharin was discovered in 1879 and was used as an artificial sweetener with zero food…
Correct answer: Carcinogenic- A. Saturated in nature
- B. Unsaturated in nature
- C. Both (a) and (b)
- D. None of these options are correct
Explanation: A fatty acid with no double bond and high melting point is called a saturated fatty acid.
Correct answer: Saturated in nature- A. Aromatic
- B. Unsaturated
- C. Saturated
- D. Options A and C are correct
Explanation: Arachidonic acid contains four double bonds, hence it is unsaturated in nature. Its structure is given below:
Correct answer: Unsaturated- A. Linoleic acid and Arachidonic acid
- B. Linolenic acid and lauric acids
- C. Arachidonic acid and carboxylic acids
- D. All of these options are correct
Explanation: Essential fatty acids are required by the body for good health, but the body cannot synthesize them by itself.They are mainly two types:1.
Correct answer: Linoleic acid and Arachidonic acid- A. 3
- B. 4
- C. 5
- D. 8
Explanation: Arachidonic acid is a 20-carbon chain with four cis-double bonds, containing carboxylic acid. It is abundantly present in the brain.
Correct answer: 4- A. It is a polyunsaturated omega-6 fatty acid
- B. It helps in the formation of membranes
- C. It is the most abundant fatty acid in the brain
- D. All of these options are correct
Explanation: Arachidonic acid is a polyunsaturated omega-6 fatty acid. It is found in phospholipids and helps in membrane formation.
Correct answer: All of these options are correct- A. Glycogen
- B. Starch
- C. Cellulose
- D. Protein
Explanation: Cellulose is produced by almost all plants so it is potentially the most common and abundant organic compound on Earth.
Correct answer: Cellulose- A. Replication
- B. Termination
- C. Duplication
- D. Translation
Explanation: The primary structure (amino acid sequence) of a protein is. determined by the sequence of codons in a messenger RNA (mRNA) molecule.
Correct answer: Translation- A. Derived protein
- B. Simple protein
- C. Proteose
- D. Conjugated protein
Explanation: A conjugated protein is a protein that functions in interaction with other non-protein chemical groups. known as prosthetic groups.
Correct answer: Conjugated protein- A. Fe+2
- B. Zn+2
- C. Mg+2
- D. None of these
Explanation: Option A is correct.The activator for cytochrome oxidase is Fe2+. Cytochrome oxidase is an enzyme that is found in the electron transport…
Correct answer: Fe+2- A. Lyases
- B. Hydrolases
- C. Ligases
- D. Transferase
- E. Isomerases
Explanation: This is the correct answer because lyases are enzymes that catalyze the addition of ammonia (NH₃), water (H₂O), or carbon dioxide (CO₂) to…
Correct answer: Isomerases- A. S
- B. C
- C. N
- D. O
Explanation: Option A is correct since sulfur is present only in some proteins, not all.The general formula for proteins is RCH(NH2)COOH implying that…
Correct answer: S