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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- A. They are conjugated molecules of carbohydrates
- B. They have a role in the extracellular matrix of animals
- C. They are components of biological membranes
- D. They are found in both plants and animals
Explanation: Connective tissues are specific to animals, providing structure and support.
Correct answer: They are found in both plants and animals- A. Maltose
- B. Sucrose
- C. Lactose
- D. Ribose 5- phosphate
Explanation: In non-reducing sugars, a free aldehyde or ketonic group is absent. Sucrose is a non-reducing sugar formed by condensation of one…
Correct answer: Sucrose- A. Help in regulating metabolism
- B. Are exclusively synthesized in the body of living organism as at present
- C. Are conjugated proteins
- D. Enhance oxidative metabolism.
Explanation: Enzymes control all the life processes. They increase the rate of a biological reaction.
Correct answer: Help in regulating metabolism1084. Chitin is a:
- A. Lipoprotein
- B. Polysacchiride
- C. Glycoprotein
- D. Phospholipid
Explanation: Lipoproteins and glycoproteins are conjugated molecules. Phospholipids are class of lipids that form basic structure of biological…
Correct answer: Polysacchiride- A. 170
- B. 25
- C. 20
- D. 3000
Explanation: 170 amino acids are present in nature in cells or tissues. 25 types of amino acid are constituents of proteins.
Correct answer: 170- A. Primary structure
- B. Tertiary structure
- C. Secondary structure
- D. Quaternary structure
Explanation: The quaternary structure of a protein refers to the arrangement of multiple polypeptide chains (subunits) to form a functional protein…
Correct answer: Quaternary structure- A. Phospholipids
- B. Glycoproteins
- C. Nucleoproteins
- D. Glycolipids
Explanation: B is correct. Most cellular secretions are glycoproteins in nature.
Correct answer: Glycoproteins- A. Amylase
- B. Iodine
- C. Lipase
- D. Glycogen
Explanation: A is correct. Amylase broke down the starch and hence it showed negative test for starch.
Correct answer: Amylase- A. Oils
- B. Solid fats
- C. Butter
- D. Banaspati
Explanation: Oils are made up of unsaturated fatty acids and are usually liquids at room temperature.
Correct answer: Oils- A. Phosphatidic acid
- B. Phosphatidylcholine
- C. Phospholipids
- D. Phosphatidylserine
Explanation: A phosphatidic acid upon combining with a choline gives rise to phosphatidylcholine. It is the most common phospholipid in nature.
Correct answer: Phosphatidylcholine- A. Proteins
- B. Lipids
- C. Nucleic acids
- D. Carbohydrates
Explanation: Proteins being a major structural organic biomolecule at any level of biological organization constitutes more than 50% of the dry weight…
Correct answer: Proteins- A. Primary configuration
- B. Secondary configuration
- C. Tertiary configuration
- D. Quaternary configuration
Explanation: A globular three-dimensional structure formed by a single polypeptide chain will be a tertiary protein, because quaternary protein is also…
Correct answer: Tertiary configuration- A. Ribosome
- B. Golgi bodies
- C. Cell wall
- D. Plasma membrane
Explanation: Cell surface markers are glycoprotein and glycolipid in nature and are present on cell membrane.
Correct answer: Plasma membrane- A. Fatty acids
- B. Glycerol
- C. Phosphate group
- D. Choline
Explanation: Phosphatidic acid is composed if 1 glycerol 2 fatty acid and 1 phosphoric acid.
Correct answer: Choline1095. Lecithin consists of:
- A. Glycerol, Fatty acids, Phosphoric acid and Choline
- B. Glycerol, Fatty acids, Phosphoric acid and Ethanolamine
- C. Glycerol, Fatty acids, Phosphoric acid and Inositol
- D. Glycerol, Fatty acids, Phosphoric acid and Serine
Explanation: Phosphatidic acid is composed if 1 glycerol 2 fatty acid and 1 phosphoric acid it combines with choline to form phosphotidyl choline also…
Correct answer: Glycerol, Fatty acids, Phosphoric acid and Choline- A. Glycosidic bond
- B. Hydrogen bond
- C. Peptide bond
- D. Disulphide bond
Explanation: A glycosidic bond is a type of covalent bond that links a carbohydrate molecule to another group, which can be another carbohydrate or a…
Correct answer: Glycosidic bond- A. C-C bonds
- B. C-H bonds
- C. C-O bonds
- D. C-N bonds
Explanation: Lipids contain double the amount of energy as compared to same amount of carbohydrates because of high proportion of C-H bonds.
Correct answer: C-H bonds- A. 1st
- B. 2nd
- C. 3rd
- D. 6th
Explanation: "The explanation for this question will be added soon!".
Correct answer: 6th- A. Glucose only
- B. Glucose and galactose
- C. Glucose and fructose
- D. All of the above
Explanation: This is correct because lactose is the disaccharide whose monomers are glucose and galactose.
Correct answer: Glucose and galactose- A. The density
- B. The branching of ethylene
- C. Reaction conditions
- D. Type of polymerization
Explanation: Ethylene is a monomer of polyethylene that is widely used as raw material for manufacturing plastics.
Correct answer: Type of polymerization