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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1,790 questions · page 80 of 90
- A. Electronegative oxygen
- B. Nitrogen atom
- C. Sulphur
- D. Both A and B
Explanation: Most contain nitrogen, and some also contain sulfur or cobalt or oxygen except carbon, hydrogen elements.
Correct answer: Both A and B- A. Vitamin C
- B. Vitamin B
- C. Both options A and B are correct
- D. None of these options is correct
Explanation: Vitamin B1 (thiamine) and vitamin B2 (riboflavin) are generally non-toxic.
Correct answer: Both options A and B are correct- A. Carbohydrates
- B. Proteins
- C. Lipids
- D. All of these
Explanation: Large organic molecules are composed of many atoms, and they are often referred to as macromolecules.
Correct answer: All of these- A. UTP
- B. FAD
- C. NAD
- D. ATP
Explanation: The most abundant free nucleotide in mammalian cells is ATP.
Correct answer: ATP1585. Carbon can form bonds with which of the following to perform various functions in living organisms?
- A. H
- B. N and O
- C. S
- D. All of the above options are correct
Explanation: Carbon can bind to H, O, N, and S and form many important structural and functional components of a living organism.
Correct answer: All of the above options are correct- 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: Choline1589. Cell surface markers are
- A. Lipoproteins
- B. Glycolipids
- C. Sphingolipids
- D. Glycoproteins
Explanation: Cell-surface markers are glycoproteins that are able to respond to or sense the environment around the cell and contain receptors that…
Correct answer: Glycoproteins- A. Glycoproteins
- B. Lipids
- C. Phospholipids
- D. Nucleoprotiens
Explanation: The nucleoprotein of negative-strand RNA viruses forms a major component of the ribonucleoprotein complex that is responsible for viral…
Correct answer: Nucleoprotiens- A. Glycoproteins
- B. Glycolipids
- C. Nucleohistones
- D. Carbohydrates
Explanation: Any protein molecule with a carbohydrate attached is known as a glycoprotein.
Correct answer: Glycoproteins- A. They are conjugated molecules of carbohydrates
- B. Both have role in the extracellular matrix of animals and bacterial cell wall
- C. They are components of biological membranes.
- D. Both are produced and secreted by endoplasmic reticulum
Explanation: D is correct because glycoprotein and glycolipids are secreted by golgi apparatus .It also modifies these conjugated molecules.
Correct answer: Both are produced and secreted by endoplasmic reticulum- A. They are conjugated molecules of carbohydrates
- B. Both have role in the extracellular matrix of animals and bacterial cell wall
- C. They are components of biological membranes.
- D. Both are produced and screted by endoplasmic reticulum
Explanation: Addition of sugars to protiens and lipids occurs in the golgi body, not in the endoplasmic reticulum.
Correct answer: Both are produced and screted by endoplasmic reticulum- A. They are conjugated molecules of carbohydrates
- B. Both have a role in extracellular matrix of animal and bacterial cell wall
- C. They are components of biological membranes
- D. Both are produced and seceted by the endoplasmic reticulum
Explanation: Proteins and lipids themselves are formed in rough and smooth endoplasmic reticulum respectively, but their conjugation with carbohydrates…
Correct answer: Both are produced and seceted by the endoplasmic reticulum- A. Starch
- B. Haemoglobin
- C. Lecithin
- D. Mucin
Explanation: One example of glycoproteins found in the body is mucins, which are secreted in the mucus of the respiratory and digestive tracts.
Correct answer: Mucin- A. 1, 2 and 3
- B. 2, 1 and 4
- C. 1 and 4 only
- D. 2 and 3 only
Explanation: Triglycerides are formed by linking fatty acids with an ester linkage to three alcohol groups in glycerol.
Correct answer: 2 and 3 only- A. Vitamin A
- B. Vitamin B
- C. Vitamin C
- D. Vitamin D
Explanation: d) Vitamin D:Ergocalciferol is the name of Vitamin D2. It is a type of vitamin D that is synthesized in plants and is also known as…
Correct answer: Vitamin D- A. Replacement of a corner fatty acid in acyl glycerol by phosphate group
- B. Their place of occurrence
- C. Phospholipid is a lipid and acyl glycerol is not
- D. Difference in number of C in fatty acid chains
- E. They are the same
Explanation: Explanation for this question will be added soon.
Correct answer: Replacement of a corner fatty acid in acyl glycerol by phosphate group- A. Terpenes
- B. Terpenoids
- C. Waxes
- D. Carotenoids
- E. Unsaturated acyl glycerol
Explanation: Explanation for this question will be added soon.
Correct answer: Waxes- A. Four 6-C rings
- B. Three 6-C rings and two 5-C rings
- C. Three 6-C rings and one 5-C ring
- D. Three 6-C rings only
- E. Two 6-C rings and one 5-C ring
Explanation: Explanation for this question will be added soon.
Correct answer: Three 6-C rings and one 5-C ring