Biomolecules
- Sugar 'X'A. is found in honey.B. is a keto sugar.C. exists in α and β - anomeric forms.D. is laevorotatory.'X' is : Answer: 2. D-Fructose Key idea: match each property. D-Fructose is present in honey, is a keto sugar (ketohexose), exists as α and β anomers... 1
- Match List I with List II.List I (Name of Vitamin): A. Vitamin B_12 B. Vitamin D C. Vitamin B_2 D. Vitamin B_6List II (Deficiency disease): I. Cheilosis II. Convulsions III. Rickets IV. Pernicious anaemiaChoose the correct answer from the options giv… Answer: 2. A-IV, B-III, C-I, D-II Vitamin mathrmB₁₂ : pernicious anaemia (IV). Vitamin D: rickets (III). Vitamin B₂ (riboflavin): cheilosis... 1
- Fehling's solution 'A' is Answer: 2. aqueous copper sulphate Key idea: Fehling's solution is prepared as two separate solutions. Fehling's A: aqueous copper sulphate.... 1
- The reagents with which glucose does not react to give the corresponding tests/products areA. Tollen's reagent B. Schiff's reagent C. HCN D. NH_2OH E. NaHSO_3Choose the correct options from the given below: Answer: 4. B and E Key idea: glucose exists mostly as the cyclic hemiacetal, so it gives some but not all aldehyde reactions. Tollens' reage... 1
- Given below are two statements :Statement I : A unit formed by the attachment of a base to 1' position of sugar is known as nucleosideStatement II : When nucleoside is linked to phosphorous acid at 5'-position of sugar moiety, we get nucleotide.In th… Answer: 4. Statement I is true but Statement II is false. Key idea: Nucleoside = base + sugar; nucleotide = nucleoside + phosphoric acid. St... 1
- The incorrect statement regarding enzymes is : Answer: 4. Enzymes are polysaccharides. Key idea: enzymes are (almost all) globular proteins, not polysaccharides. Statements 1 to 3 are tru... 1
- Match List - I with List - II.List - I (Drug class): (a) Antacids (b) Antihistamines (c) Analgesics (d) AntimicrobialsList - II (Drug molecule): (i) Salvarsan (ii) Morphine (iii) Cimetidine (iv) SeldaneChoose the correct answer from the options given… Answer: 3. (a) - (iii), (b) - (iv), (c) - (ii), (d) - (i) Key idea: match each drug class with a standard example. Antacids: cimetidine (iii... 1
- The RBC deficiency is deficiency disease of : Answer: 1. Vitamin B₁₂ Key idea: vitamin mathrmB₁₂ is needed for red blood cell formation. Its deficiency causes pernicious anaemia (reduced... 1
- Given below are two statements :Statement I : Aspirin and Paracetamol belong to the class of narcotic analgesics.Statement II : Morphine and Heroin are non-narcotic analgesics.In the light of the above statements, choose the correct answer from the o… Answer: 2. Both Statement I and Statement II are false. Key idea: aspirin and paracetamol are non-narcotic analgesics; morphine and heroin a... 1
- Which of the following is a basic amino acid ? Answer: 4. Lysine A basic amino acid has an extra basic group (amino) in its side chain. Lysine, H₂N(CH₂)₄CH(NH₂)COOH , has two amino groups... 1
- Which of the following is a natural polymer ? Answer: 1. cis-1,4-polyisoprene Natural rubber is cis-1,4-polyisoprene, a polymer made by plants. Poly(butadiene-styrene) (SBR), polybutadie... 1
- Sucrose on hydrolysis gives : Answer: 3. α -D-Glucose + β -D-Fructose Sucrose is made of α -D-glucose and β -D-fructose joined through C1 of glucose and C2 of fructose (a... 1
- Among the following, the narrow spectrum antibiotic is : Answer: 1. penicillin G Narrow spectrum antibiotics act on a limited range of bacteria. Penicillin G is mainly effective against gram-positi... 1
- The non-essential amino acid among the following is : Answer: 3. alanine Essential amino acids cannot be made by the body and must come from food: valine, leucine, lysine (and isoleucine, etc.).... 1
- Which of the following compounds can form a zwitterion ? Answer: 4. Glycine A zwitterion needs both an acidic group and a basic group in the same molecule, so the proton moves from the acid to the... 1
- Regarding cross-linked or network polymers, which of the following statements is incorrect ? Answer: 4. They contain strong covalent bonds in their polymer chains. Cross-linked (network) polymers are formed from bi- and tri-functiona... 1
- The difference between amylose and amylopectin is Answer: 1. Amylopectin have 1 → 4 α -linkage and 1 → 6 α -linkage Both amylose and amylopectin are polymers of α -D-glucose, and they differ... 1
- Which of the following are not polymeric ? Answer: 3. Lipids Key idea: A polymer is a long chain of repeating monomer units. Proteins: chains of amino acids. Polysaccharides: chains o... 1
- Which of the following statements is not correct ? Answer: 3. Denaturation makes the proteins more active. Key idea: denaturation destroys the 3-D structure. On denaturation (heat, acid), sec... 1
- The correct corresponding order of names of four aldoses with configuration given below [four Fischer projections] respectively, is Answer: 3. D-erythrose, D-threose, L-erythrose, L-threose Key idea: D/L is decided by the OH on the lowest chiral carbon (right = D). Erythr... 1
- The correct statement regarding RNA and DNA, respectively is : Answer: 2. The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose. Key idea: RNA has the sugar D-ribose and D... 1
- Which one given below is a non-reducing sugar ? Answer: 4. Sucrose Key idea: a sugar is non-reducing when both anomeric carbons are tied up in the glycosidic bond, leaving no free hemiacet... 1
- In a protein molecule various amino acids are linked together by : Answer: 3. peptide bond Key idea: amino acids join through the amide linkage between the -COOH of one and the -NH₂ of the next, formed by lo... 1