Biomolecules: proteins, carbohydrates, lipids, nucleic acids

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Match List I with List II.List I: A. Adenosine B. Adenylic acid C. Adenine D. AlanineList II: I. Nitrogen base II. Nucleotide III. Nucleoside IV. Amino acidChoose the option with all correct matches. Answer: 3. A-III, B-II, C-I, D-IV Key idea: Know the building blocks of nucleic acids: base, nucleoside, nucleotide. Adenosine = adenine + s... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Match List I with List IIList I: A. GLUT-4; B. Insulin; C. Trypsin; D. CollagenList II: I. Hormone; II. Enzyme; III. Intercellular ground substance; IV. Enables glucose transport into cellsChoose the correct answer from the options given below: Answer: 2. A-IV, B-I, C-II, D-III Key idea: match the protein with its role. GLUT-4: enables glucose transport into cells (IV). Insulin: hor... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Lecithin, a small molecular weight organic compound found in living tissues, is an example of: Answer: 3. Phospholipids Key idea: lecithin is a phospholipid. It has glycerol, two fatty acids, a phosphate group and a choline head. Becau... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Given below are two statements:Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (N-terminal)Statement II: Adult human haemoglobin, consists of 4 s… Answer: 1. Statement I is false but Statement II is true. Key idea: Check the orientation of a protein and the structure of haemoglobin. Sta... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Cellulose does not form blue colour with Iodine because Answer: 4. It does not contain complex helices and hence cannot hold iodine molecules. Key idea: The blue colour of the starch-iodine test c... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Match List - I with List - II.List - I (Biological Molecules): (a) Glycogen (b) Globulin (c) Steroids (d) ThrombinList - II (Biological functions): (i) Hormone (ii) Biocatalyst (iii) Antibody (iv) Storage productChoose the correct answer from the opt… Answer: 1. (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii) Key idea: Match molecule and function. (a) Glycogen: storage product, (iv). (b) Gl... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is C_6H_12O_6 then what is the formula for maltose ? Answer: 4. C₁₂H₂₂O₁₁ Key idea: A dehydration reaction removes one water molecule when two units join. 2 glucose = mathrmC₁₂H₂₄O₁₂ . Subtract... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Read the following statements on lipids and find out correct set of statements :(a) Lecithin found in the plasma membrane is a glycolipid(b) Saturated fatty acids possess one or more c=c bonds(c) Gingely oil has lower melting point, hence remains as… Answer: 4. (c), (d) and (e) only (a) Lecithin is a phospholipid, not a glycolipid: false. (b) Saturated fatty acids have no double bonds: fa... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Exoskeleton of arthropods is composed of : Answer: 4. Chitin The arthropod exoskeleton is made of chitin, a polymer of N-acetylglucosamine. Glucosamine is only its monomer unit, cutin... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Following are the statements with reference to ‘lipids’.(a) Lipids having only single bonds are called unsaturated fatty acids.(b) Lecithin is a phospholipid.(c) Trihydroxy propane is glycerol.(d) Palmitic acid has 20 carbon atoms including carboxyl… Answer: 3. (b) and (c) only (a) False: lipids with only single bonds are saturated. (b) True: lecithin is a phospholipid. (c) True: glycerol... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Identify the incorrect pair. Answer: 4. Drugs - Ricin Codeine is an alkaloid - correct. Abrin is a toxin - correct. Concanavalin A is a lectin - correct. Ricin is a toxi... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Match List - I with List - II.List - I | List - II(a) Protein | (i) C=C double bonds(b) Unsaturated fatty acid | (ii) Phosphodiester bonds(c) Nucleic acid | (iii) Glycosidic bonds(d) Polysaccharide | (iv) Peptide bondsChoose the correct answer from t… Answer: 1. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Match each biomolecule with its bond: Protein: peptide bonds, (a)-(iv). Unsaturated fatty... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which of the following are not secondary metabolites in plants ? Answer: 2. Amino acids, glucose Secondary metabolites include alkaloids (morphine, codeine), terpenoids (vinblastin), pigments and drugs (cu... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Identify the basic amino acid from the following. Answer: 3. Lysine Lysine has an extra amino group in its side chain, so it is a basic amino acid (like arginine and histidine). Glutamic aci... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which one of the following is the most abundant protein in the animals ? Answer: 2. Collagen Collagen is the most abundant protein in animals (and RuBisCO is the most abundant protein in the whole biosphere). Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their : Answer: 3. Defence action Key idea: Secondary metabolites are not needed for basic growth but have ecological roles. Nicotine, strychnine an... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Identify the substances having glycosidic bond and peptide bond, respectively in their structure : Answer: 4. Inulin, insulin Key idea: Glycosidic bonds link sugars in polysaccharides; peptide bonds link amino acids in proteins. Inulin is... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Concanavalin A is : Answer: 3. a lectin Concanavalin A is a lectin, a carbohydrate-binding protein extracted from jack bean. It is not an alkaloid, an essential... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
The two functional groups characteristic of sugars are Answer: 4. carbonyl and hydroxyl Sugars are polyhydroxy aldehydes or ketones, so they have a carbonyl group (aldehyde or ketone) and several... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins? Answer: 3. Ester bonds Protein 3D structure is stabilised by hydrogen bonds, hydrophobic interactions, ionic (electrostatic) interactions an... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
A typical fat molecule is made up of : Answer: 2. One glycerol and three fatty acid molecules A triglyceride (typical fat) is formed by esterification of one glycerol with three f... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which one of the following statements is wrong ? Answer: 4. Glycine is a sulphur containing amino acid. Glycine is the simplest amino acid, with H as its R group, and has no sulphur. The su... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
The two polypeptides of human insulin are linked together by : Answer: 4. Disulphide bridges Key idea: Insulin has two chains, A (21 amino acids) and B (30 amino acids), held together by disulphide bridg... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer