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 5 of 15
- A. Fermentation
- B. Inversion
- C. Esterification
- D. Rearrangement
Explanation: Fermentation is the metabolic process where enzymes break down sugars into alcohol and carbon dioxide.
Correct answer: Fermentation- A. 8.0
- B. 6.0
- C. 5.4
- D. 7.4
Explanation: The normal pH of human blood is tightly maintained within a narrow, slightly alkaline range of 7.35 to 7.45.
Correct answer: 7.4- A. Serum proteins present in the blood act as buffer
- B. Na-K channels maintain the flow of hydrogen ions
- C. Hb acts as a buffer and also helps in its coagulation
- D. It is neutral
Explanation: Human blood contains several buffer systems to resist pH changes. The primary buffer system in the blood plasma (serum) is the carbonic…
Correct answer: Serum proteins present in the blood act as buffer- A. More stable than the O2-Hb bond
- B. Less stable than the O2-Hb bond
- C. The stability of both bonds is approximately the same
- D. CO-Hb does not exist
Explanation: The bond between carbon monoxide and haemoglobin (carboxyhaemoglobin) is extremely stable, approximately 200-250 times more stable than…
Correct answer: More stable than the O2-Hb bond- A. (I) − (C); (II) − (D); (III) − (B); (IV) − (A)
- B. (I) − (A); (II) − (B); (III) − (C); (IV) − (D)
- C. (I) − (D); (II) − (C); (III) − (B); (IV) − (A)
- D. (I) − (C); (II) − (D); (III) − (A); (IV) − (B)
Explanation: Scurvy is caused by a deficiency of Ascorbic Acid (Vitamin C). Night blindness is caused by a deficiency of Retinol (Vitamin A).
Correct answer: (I) − (C); (II) − (D); (III) − (B); (IV) − (A)- A. A
- B. D
- C. B12
- D. K
Explanation: Vitamin K is a fat-soluble vitamin that is essential for the synthesis of several proteins required for blood coagulation, including…
Correct answer: K- A. Progesterone
- B. Testosterone
- C. Tetraiodothyronine
- D. Estrogen
Explanation: Tetraiodothyronine (T4) and triiodothyronine (T3) are hormones produced by the thyroid gland.
Correct answer: Tetraiodothyronine- A. Rickets
- B. Chicken pox
- C. Malaria
- D. Small pox
Explanation: Malaria is an infectious disease caused by protozoan parasites of the genus Plasmodium.
Correct answer: Malaria- A. Soluble in water
- B. Helps in healing wounds
- C. Easily destroyed by oxidation
- D. All of these
Explanation: Ascorbic acid is indeed soluble in water, easily destroyed by oxidation, and helps in healing wounds through collagen synthesis.
Correct answer: All of these- A. Vitamin E
- B. Vitamin B1
- C. Vitamin K
- D. Vitamin D
Explanation: Vitamin B1 is also known as thiamine. Its chemical structure contains both a pyrimidine ring (with nitrogen) and a thiazole ring (with…
Correct answer: Vitamin B1- A. Vitamin C
- B. Vitamin K
- C. Vitamin A
- D. Vitamin D
Explanation: Vitamins are classified as either fat-soluble (A, D, E, K) or water-soluble (B-complex vitamins and Vitamin C).
Correct answer: Vitamin C- A. C2nHnO2n
- B. Cn(H2O)2n
- C. Cn(H2O)n
- D. CnH3nO2n
- E. Hn(C2O)n
Explanation: The term carbohydrate means "hydrate of carbon." Many common carbohydrates have the empirical formula CH2O, which can be generalized to…
Correct answer: Cn(H2O)n- A. Glucose has one −CHO group
- B. Glucose has five −OH groups and one primary alcohol group
- C. Glucose gives a positive Fehling's solution test
- D. Glucose has five secondary alcohol groups
Explanation: The open-chain structure of glucose contains one aldehyde group, four secondary alcohol groups (on carbons 2, 3, 4, and 5), and one…
Correct answer: Glucose has five secondary alcohol groups- A. 12
- B. 10
- C. 5
- D. 14
Explanation: The number of essential amino acids is 10. As they are synthesized internally from other amino acids and metabolic intermediates, they do…
Correct answer: 10- A. One mole of glucose and two moles of fructose
- B. One mole of glucose and one mole of fructose
- C. Two moles of glucose
- D. Two moles of fructose
Explanation: Sucrose is a disaccharide made up of two simpler sugar units. Hydrolysis breaks the glycosidic bond, yielding its constituent…
Correct answer: One mole of glucose and one mole of fructose- A. Its optical rotation sign changes from dextrorotatory (+) to levorotatory (-)
- B. Its optical rotation sign changes from levorotatory (-) to dextrorotatory (+)
- C. Its optical rotation sign remains unchanged
- D. None of the given options are correct
Explanation: Sucrose is dextrorotatory (+66.5°). Upon hydrolysis, it forms a mixture of glucose (+52.5°) and fructose (-92.0°).
Correct answer: Its optical rotation sign changes from dextrorotatory (+) to levorotatory (-)- A. Glucose
- B. Maltose
- C. Sucrose
- D. Aspartame
Explanation: Aspartame is a low-calorie artificial sweetener that is a dipeptide of aspartic acid and phenylalanine.
Correct answer: Aspartame- A. Iodine
- B. Ketone
- C. Fructose
- D. Protein
Explanation: The iodine test is a classic chemical test for the presence of starch. The helical structure of the amylose component of starch traps…
Correct answer: Iodine- A. Epimers
- B. Enantiomers
- C. Diastereomers
- D. Anomers
Explanation: Anomers are a specific type of epimer. They are diastereomers of cyclic saccharides that differ in configuration only at the anomeric…
Correct answer: Anomers- A. Sucrose
- B. Raffinose
- C. Maltose
- D. Lactose
Explanation: Maltose, also known as malt sugar, is a disaccharide composed of two α-glucose units linked together.
Correct answer: Maltose