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. Ribose sugar
- B. RNA
- C. DNA
- D. ATP
Explanation: C5H10O5 is the formula for the sugar molecule called ribose. Ribose is a pentose sugar, meaning it has five carbon atoms, and is…
Correct answer: Ribose sugar- A. Cn(H2O)n
- B. C2(H2O)n
- C. C(H2O)n
- D. C1(H2O)n
Explanation: General fomrula of monosaccharides is Cn(H2O)n as number of carbon and oxygen is usually same in monosaccharides.
Correct answer: Cn(H2O)n- A. Muscles and Liver
- B. Around Belly and Hips
- C. Around Thighs and Belly
- D. Liver and Kidney's
Explanation: Glycogen is called as animal starch and it is abundantly found in muscle and liver cells of animal tissue.
Correct answer: Muscles and Liver- A. All carbon contain OH except carbonyl carbon
- B. Digestion by amylase enzyme
- C. Primary product of photosynthesis
- D. Very simple and very sweet in taste
Explanation: This statement is incorrect. Monosaccharides are already in their simplest form and do not require digestion by enzymes like amylase.
Correct answer: Digestion by amylase enzyme- A. Storage protein
- B. Structural protein
- C. Enzymatic protein
- D. Hormonal protein
Explanation: Proteins of hair, horns, feathers, and other skin parts are primarily structural proteins.
Correct answer: Structural protein486. Usually a polypeptide chain bends and folds upon itself to form a globular shape. This is protein's:
- A. Primary conformation
- B. Tertiary conformation
- C. Secondary conformation
- D. Quaternary conformation
Explanation: The tertiary conformation refers to the three-dimensional arrangement of a single polypeptide chain.
Correct answer: Tertiary conformation- A. Carbon
- B. Hydrogen
- C. Oxygen
- D. Nitrogen
Explanation: Carbon, hydrogen, and oxygen are also important elements in biological molecules, nitrogen stands out as the primary element associated…
Correct answer: Nitrogen- A. Protein
- B. Fats
- C. Carbohydrate
- D. Vitamins
Explanation: Enzymes are a type of biomolecule known as proteins. Proteins are large molecules composed of amino acids linked together in a specific…
Correct answer: Protein- A. C-C-N
- B. -NH2 Group
- C. -COOH group
- D. -H group
Explanation: The backbone of an amino acid is composed of a central carbon (C) atom, a hydrogen (H) atom, an amino (NH2) group, and a carboxyl (COOH)…
Correct answer: C-C-N- A. Hydrogen bonds
- B. Ionic bonds
- C. Disulphide linkage
- D. Peptide bonds
Explanation: The bonds present in an alpha helix are hydrogen bonds. In an alpha helix, the backbone of the polypeptide chain forms a helical structure…
Correct answer: Hydrogen bonds- A. Primary structure
- B. Tertiary structure
- C. Secondary structure
- D. Quaternary structure
Explanation: The sequence of amino acids in a polypeptide chain, known as the primary structure, is crucially important for determining a protein's…
Correct answer: Primary structure- A. Cluster
- B. Spherical or curled up ball
- C. Flat uncoiled chains
- D. Long strands or librils
Explanation: Fibrous proteins are characterized by their long, elongated strands or fibrils.
Correct answer: Long strands or librils- A. Lipids
- B. Carbohydrates
- C. Vitamins
- D. Proteins
Explanation: The picture represents an amino acid, which is the building block of proteins.
Correct answer: Proteins- A. Deaminase
- B. Rennin
- C. Oxidase
- D. Catalase
Explanation: Protease is an enzyme that cleaves peptide bonds. Rennin, also known as chymosin, is a protease enzyme that plays a crucial role in the…
Correct answer: Rennin- A. Serine
- B. Ethanolamine
- C. Choline
- D. Aspartic acid
Explanation: Serine is an amino acid and is also a part of phospholipids. It is one of the 20 standard amino acids used in protein synthesis, and it…
Correct answer: Serine- A. Sphingolipids
- B. Ethanolamine
- C. Choline
- D. Waxes
Explanation: The myelin sheath is primarily composed of lipids, and sphingolipids are a major component of it.
Correct answer: Sphingolipids- A. Amino acid
- B. Nucleotides
- C. Monosaccharides
- D. All of these
Explanation: Option D is correct. Biopolymers are large molecules made up of repeating units of smaller molecules.
Correct answer: All of these- A. Glucose and Oxygen
- B. An ester and Water molecule
- C. Glycogen and Water molecule
- D. Glycerol and Sulfuric acid
Explanation: Option B is correct. The product formed at the end of the experiment will be an ester.
Correct answer: An ester and Water molecule- A. Lower proportion of C-H bonds
- B. Higher proportion of C-H bonds
- C. Higher proportion of oxygen
- D. None of these
Explanation: Option B is correct. Yes, that is correct. Lipids contain more energy than carbohydrates because they have a higher proportion of…
Correct answer: Higher proportion of C-H bonds- A. Alcohol
- B. Ether
- C. Chloroform
- D. Water
Explanation: Option D is correct. Lipids are organic molecules that are insoluble in water.
Correct answer: Water