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 9 of 15
- A. A
- B. B
- C. C
- D. D
Explanation: The following is the structure of a dipeptide.
Correct answer: D- A. C and C
- B. O and C
- C. C and N
- D. C and H
Explanation: Two or more amino acids condensed to form protein by a peptide linkage which is present between two atoms of C and N.
Correct answer: C and N- A. A
- B. B
- C. C
- D. D
Explanation: An amino acid has both a basic amine group and an acidic carboxylic acid group.
Correct answer: D- A. Glycine
- B. Lysine
- C. Aspartic acid
- D. Alanine
Explanation: In alanine, the alkyl chain (-R) consists of a -CH3 group.
Correct answer: Alanine- A. 4
- B. 6
- C. 5
- D. 7
Explanation: Ribose and deoxyribose are 5 carbon sugars which are found in RNA and DNA.
Correct answer: 5166. The increased quantities of cholesterol in blood make plaque like deposits in the arteries causing:
- A. Cholera
- B. Down's syndrome
- C. Heart attack
- D. Phenylketonuria
Explanation: When there are increased quantities of chloesterol in the blood, it can lead to the formation of plaque like deposits in the arteries.
Correct answer: Heart attack- A. COOH
- B. NH2
- C. CH2COO-
- D. OH-
Explanation: Zwitter ions are ions with two functional groups; they contain both positive and negative charges and are considered neutral.
Correct answer: COOH- A. Lysine
- B. Leucine
- C. Alanine
- D. Glycine
Explanation: Glycine is the simplest amino acid because it has the smallest side chain, which consists of just a single hydrogen atom.
Correct answer: Glycine- A. Carbon and Hydrogen
- B. Carbon and Oxygen
- C. Carbon, Hydrogen and Oxygen
- D. Hydrogen and Oxygen
Explanation: Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen atoms in specific ratios.
Correct answer: Carbon, Hydrogen and Oxygen- A. Adenine
- B. Guanine
- C. Uracil
- D. Cytosine
Explanation: Uracil is a nitrogen base present in RNA but not in DNA. In DNA, the nitrogen bases are adenine (A), guanine (G), cytosine (C), and…
Correct answer: Uracil- A. 50%
- B. 10%
- C. 30%
- D. 100%
Explanation: Nearly 45% of woody trees contain cellulose. While 25% of woody plants are lignin.
Correct answer: 50%- A. Cellulose
- B. Raffinose
- C. Ribose
- D. Starch
Explanation: The intense blue color formed when an unknown compound is added to iodine indicates the formation of a starch-iodine complex.
Correct answer: Starch- A. Chlorofluorocarbon
- B. Freon
- C. Smog
- D. Both a and b
Explanation: This option is correct. The ozone layer in the upper atmosphere can be depleted or destroyed by certain substances known as…
Correct answer: Both a and b174. Enzyme show optimum activity between 37°C and 50°C It, however loses activity permanently above
- A. Above 40°C
- B. Below 37°C
- C. it loses activity permanently above 50°C
- D. It loses activity permanently below 37°C
Explanation: If the optimum temperature for an enzyme is 37°C to 50°C, it means that increasing temperature above 50°C, will denature the enzyme and it…
Correct answer: it loses activity permanently above 50°C- A. Increase rate of chemical reaction
- B. decrease rate of chemical reaction
- C. has no effect on chemical reaction
- D. Stops chemical reaction
Explanation: Enzyme increases the rate of a chemical reaction by decreasing activation energy of reaction.
Correct answer: Increase rate of chemical reaction- A. Amino Acid and small polypeptide
- B. Only Amino Acid
- C. Only small polypeptide
- D. Only ammonia
Explanation: This option suggests that the only product of protein digestion before absorption is amino acids. This is correct option
Correct answer: Only Amino Acid- A. C₆H₅N
- B. C5H5N
- C. C5H5NH
- D. C₆H₆N
Explanation: The correct answer is B. The molecular formula C5H5N represents pyridine.
Correct answer: C5H5N- A. Starch
- B. Denatured protein
- C. Cellulose
- D. Fructose
Explanation: Humans are unable to digest cellulose, a type of complex carbohydrate (fiber) found in plant cell walls, due to the lack of the enzyme…
Correct answer: Cellulose- A. Lipases
- B. Amylase
- C. Maltase
- D. Hydrolases
Explanation: Amylase is an enzyme that breaks down complex carbohydrates ino smaller sugars, such as maltose.
Correct answer: Amylase- A. Hemoglobin
- B. Glycoproteins
- C. Ceruloplasmin
- D. Histones
Explanation: Ceruloplasmin is a copper-containing protein found in blood plasma. It plays a crucial role in binding and transporting copper throughout…
Correct answer: Ceruloplasmin