Free Conjugated Molecules MCQs with Answers
34 Conjugated 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.
Conjugated molecules contain a non-protein component attached to a protein portion, giving the molecule properties that a simple protein lacks. The content includes glycoproteins, lipoproteins, phosphoproteins, nucleoproteins, chromoproteins and metalloproteins, with attention to their prosthetic groups and roles in transport, protection, catalysis and cellular structure.
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- A. two identical monomers joined together
- B. a protein combined with a non-protein group
- C. a lipid combined with another lipid
- D. a polysaccharide broken into monosaccharides
Explanation: Conjugated molecules are built from two different classes of biological molecule joined together, so a glycoprotein is protein plus…
Correct answer: a protein combined with a non-protein group- A. consists of four identical polypeptide chains
- B. contains only amino acids joined by peptide bonds
- C. is made in the bone marrow rather than the liver
- D. contains a non protein haem group attached to its polypeptide chains
Explanation: A conjugated protein is a protein permanently joined to a non protein prosthetic group, and in haemoglobin each of the four chains carries…
Correct answer: contains a non protein haem group attached to its polypeptide chains- A. Lipids and proteins
- B. Carbohydrates and proteins
- C. Nucleic acid and proteins
- D. Fatty acids and carbohydrates
Explanation: The prefix glyco means sugar, so a glycoprotein is protein joined to a carbohydrate group, and such molecules coat the cell surface where…
Correct answer: Carbohydrates and proteins- A. Calcium
- B. Iron
- C. Water
- D. Carbohydrates
Explanation: Iron is essential because it forms the haem group of haemoglobin, which binds oxygen reversibly in red blood cells.
Correct answer: Iron- A. copper
- B. magnesium
- C. iron
- D. None of these
Explanation: Chlorophyll is a chelate in which a magnesium ion is held at the centre of a large porphyrin-like ring.
Correct answer: magnesium- A. Chromo-proteins
- B. Lipo-proteins
- C. Phospho-proteins
- D. Nucleo-proteins
Explanation: Nucleoproteins consist of nucleic acids associated with proteins, and nucleic acids such as DNA carry hereditary information.
Correct answer: Nucleo-proteins- A. Hormones
- B. Hemoglobin
- C. Red blood cell
- D. White blood cell
Explanation: Hemoglobin is an iron-containing conjugated protein because its globin protein is combined with haem groups containing iron.
Correct answer: Hemoglobin- A. Chlorophyll e
- B. Chlorophyll d
- C. Chlorophyll a
- D. Chlorophyll c
Explanation: Bacteriochlorophylls are specialized pigments of photosynthetic bacteria and include forms such as bacteriochlorophylls a, b, c, d and e.
Correct answer: Chlorophyll a- A. Glycolipids
- B. Glycoproteins
- C. Nucleohistones
- D. None of these
Explanation: Nucleohistones consist of DNA associated with histone proteins and help package DNA into chromosomes, influencing which genes are…
Correct answer: Nucleohistones- A. Glycolipids
- B. Glycoproteins
- C. Nucleohistones
- D. Proteins
Explanation: Many cellular secretions are glycoproteins, in which carbohydrate groups are attached to protein molecules; examples include several…
Correct answer: Glycoproteins- A. Extracellular
- B. Intracellular
- C. Both of these
- D. Glucose
Explanation: Glycolipids and glycoproteins contribute carbohydrate-containing structures to the extracellular matrix and cell surface, where they help…
Correct answer: Extracellular- A. C55H70O5N4Mg
- B. C55H72O6N4Mg
- C. C55H70O6N4Mg
- D. C55H72O5N4Mg
Explanation: The molecular formula of chlorophyll b is C55H70O6N4Mg, with magnesium held in the porphyrin-like ring and six oxygen atoms present.
Correct answer: C55H70O6N4Mg- A. They are conjugated molecules of carbohydrates
- B. Both have role in the extra cellular matrix of animals and bacterial cell wall
- C. They are components of biological membranes.
- D. Both are produced and secreted by endoplasmic reticulum
Explanation: Glycoproteins and glycolipids are carbohydrate-containing conjugated molecules found in membranes and in important extracellular…
Correct answer: Both are produced and secreted by endoplasmic reticulum- A. Fe2+
- B. Mg2+
- C. Zn2+
- D. Cu2+
Explanation: Chlorophyll is a magnesium-containing porphyrin pigment, so Mg2+ occupies its central position and helps absorb light energy.
Correct answer: Mg2+- A. Carotenes
- B. Carotenoids
- C. Xanthophylls
- D. Chlorophyll
Explanation: Carotenes are carotenoid pigments that commonly produce red, orange or orange-yellow colours and contain only carbon and hydrogen.
Correct answer: Carotenes- A. Lipoproteins
- B. Glycolipids
- C. Sphingolipids
- D. Glycoproteins
- E. both b and d
Explanation: The correct answer is both b and d because both glycolipids and glycoproteins are classified as cell surface markers.
Correct answer: both b and d- A. Glycolipids
- B. Glycoproteins
- C. Lipopolysaccharides
- D. Lipoproteins
Explanation: They act as surfactant during respiratory distress syndrome when surfactant production is insufficient or absent, which causes alveolar…
Correct answer: Lipoproteins- A. Fe2+
- B. Mg2+
- C. Mn2+
- D. Ca2+
Explanation: The chlorophyll molecule consists of a central magnesium atom surrounded by a nitrogen- containing structure called a porphyrin ring…
Correct answer: Mg2+- A. Proteins and carbohydrates
- B. Fats and proteins
- C. Fats and carbohydrates
- D. Vitamins and fats
Explanation: 'Chylomicrons' are a type of lipoprotein. As the name suggests, lipo- means lipids and proteins.
Correct answer: Fats and proteins- A. Serine
- B. Choline
- C. Inositol
- D. Ethanolamine
Explanation: 'Lecithin', also called Phosphatidylcholine, is a group of phospholipids (phosphoglycerides) that are important in cell structure and…
Correct answer: CholineConjugated Molecules MCQs: common questions
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