Recent questions tagged biomolecules

Which force is responsible for the stacking of $\alpha$-helix structure of protein? (1) H-bonding (2) Ionic bonding (3) Covalent bond (4) Vander Wal forces

The correct observation in the following reaction is: $\require{mhchem}\ce{Sucrose->[\text{Gly cosidic bond}][\text{Cleavage (Hydrolysis)}]A + B->[\text{Seliw anoff}][\text{Reagent}]?}$ (1) Formation of blue colour (2) Formation of violet colour (3) ...

Which of the following statement is not true about glucose? (1) It is an aldopentose. (2) It is an aldohexose. (3) It contains five hydroxyl groups. (4) It is a reducing sugar.

The reaction of concentrated sulphuric acid with carbohydrates (C12H22O11) is an example of (1) Sulphonation (2) Dehydration (3) Oxidation (4) Reduction

Match the following (a) Aquaporin (i) Amide (b) Asparagine (ii) Polysaccharide (c) Abscisic acid (iii) Polypeptide (d) Chitin (iv) Carotenoids Select the correct option (1) (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv) (2) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) (3...

Identify the statement which is incorrect. (1) Tyrosine possesses aromatic ring in its structure (2) Sulphur is an integral part of cysteine (3) Glycine is an example of lipids (4) Lecithin contains phosphorus atom in its structure

Deficiency of which vitamin causes osteomalacia? (1) Vitamin E (2) Vitamin A (3) Vitamin D (4) Vitamin K

Which of the following statements is correct ? (1) Adenine pairs with thymine through two H-bonds. (2) Adenine pairs with thymine through one H-bond. (3) Adenine pairs with thymine through three H-bonds. (4) Adenine does not pair with thymine.

The two functional groups characteristic of sugars are : (1) carbonyl and phosphate (2) carbonyl and methyl (3) hydroxyl and methyl (4) carbonyl and hydroxyl

The term 'Nuclein' for the genetic material was used by (1) Mendel (2) Franklin (3) Meischer (4) Chargaff

Which one of the following is the most abundant protein in the animals? (1) Heamoglobin (2) Collagen (3) Lectin (4) Insulin

Identify the basic amino acid from the following : (1) Tyrosine (2) Glutamic acid (3) Lysine (4) Valine

Identify the substances having glycosidic bond and peptide bond, respectively in their structure : (1) Chitin, cholesterol (2) Glycerol , trypsin (3) Cellulose, lecithin (4) Inulin ,insulin

Floridean starch has structure similar to: (1) Starch and cellulose (2) Amylopectin and glycogen (3) Mannitol and algin (4) Laminarin and cellulose

Which of the following statements is not correct? (a) Ovalbumin is a simple food reserve in egg white. (b) Blood proteins thrombin and fibrinogen are involved in blood clotting. (c) Denaturation makes the proteins more active. (d) Insulin maintains sugar ...

Which one of the following statements is incorrect ? (a) The competitive inhibitor does not affect the rate of breakdown of the enzyme-­substrate complex. (b) The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate. (c) A ...

Which of the following biomolecules does have a phosphodiester bond ? (a) Amino acids in a polypeptide (b) Nucleic acids in a nucleotide (c) Fatty acids in a diglyceride (d) Monosaccharides in a polysaccharide

The chitinous exoskeleton of arthropods is formed by the polymerisation of (a) N ­- acetyl glucosamine (b) lipoglycans (c) keratin sulphate and chondroitin sulphate (d) D ­- glucosamine.

Which one of the following statements is wrong ? (a) Uracil is a pyrimidine. (b) Glycine is a sulphur containing amino acid. (c) Sucrose is a disaccharide. (d) Cellulose is a polysaccharide.

A typical fat molecule is made up of (a) one glycerol and one fatty acid molecule (b) three glycerol and three fatty acid molecules (c) three glycerol molecules and one fatty acid molecule (d) one glycerol and three fatty acid molecules.

Which of the following describes the given graph correctly ? (a) Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme. (b) Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme. (c) Endothermic ...

Which of the following is the least likely to be involved in stabilising the three-­dimensional folding of most proteins ? (a) Hydrogen bonds (b) Electrostatic interaction (c) Hydrophobic interaction (d) Ester bonds

A non­proteinaceous enzyme is (a) lysozyme (b) ribozyme (c) ligase (d) deoxyribonuclease.

Which of the following are not polymeric ? (a) Proteins (b) Polysaccharides (c) Lipids (d) Nucleic acids

Which of the following statements is correct with reference to enzymes ? (a) Holoenzyme = Apoenzyme + Coenzyme (b) Coenzyme = Apoenzyme + Holoenzyme (c) Holoenzyme = Coenzyme + Co­factor (d) Apoenzyme = Holoenzyme + Coenzyme

Which of the following is a basic amino acid ? (1) Serine (2) Alanine (3) Tyrosine (4) Lysine

The non-essential amino acid among the following is: (1) valine (2) leucine (3) alanine (4) lysine