Tiêu đề 14.BIOMOLECULES - Questions.pdf ✅

14.BIOMOLECULES (1.)Which of the following is ketohexose? (a.) Glucose (b.) Sucrose (c.) Fructose (d.) Ribose (2.)Experimental material in the study of DNA replication has been (a.) Escherichia coli (b.) Drosophila melanogaster (c.) Pneumococcus (d.) Neurospora crassa (3.)Which one of the following statements is true? (a.) Saponification of oil yields a diol (b.) Drying of oil involves hydrolysis (c.) Addition of antioxidant to oil minimizes rancidity (d.) Refining of oil involves hydrogenation (4.)Which of the following is not a function of proteins? (a.) Nail formation (b.) Skin formation (c.) Muscle formation (d.) Providing energy for metabolism (5.)Which enzyme convert glucose into alcohol? (a.) Invertase (b.) Zymase (c.) Maltase (d.) Diastase (6.)The charring of sugar when it is treated with conc. H2SO4 is due to (a.) Oxidation (b.) Reduction (c.) Dehydration (d.) Hydrolysis (7.)The sweetest carbohydrate is (a.) Sucrose (b.) Glucose (c.) Fructose (d.) Lactose (8.)Which set of terms correctly identifies the carbohydrate shown? 1. Pentose 2. Hexose 3. Aldose 4. Ketose 5. Pyranose (a.) 1, 3 and 6 (b.) 1, 3 and 5 (c.) 2, 3 and 5 (d.) 2, 3 and 6 (9.)Glucose is a/an (a.) Polyhydroxy ketone (b.) Alcohol (c.) Hydrate of carbon (d.) Pentahydroxy aldehyde (10.)All monosaccharides .............. Tollen’s reagent. (a.) Oxidises (b.) Condense with (c.) Reduces (d.) Add to (11.)A compound gives negative test with ninhydrin and positive test with Benedict’s solution. The compound is (a.) A protein (b.) An amino acid (c.) A lipid (d.) A mono saccharide (12.)Raffinose is (a.) Trisaccharide (b.) Disaccharide (c.) Monosaccharide (d.) Polysaccharide (13.)How many hydrogen bonds are present between pair of thymine and adenine in DNA? (a.) 1-hydrogen bond (b.) 2- hydrogen bond (c.) 3-hydrogen bond (d.) No bonds occur (14.)Which enzyme is present in salive? (a.) Urease (b.) Maltase (c.) Lactase (d.) Amylase (15.)Which of the following is a protein? (a.) Pepsin (b.) Adrenaline (c.) ATP (d.) Glutamine (16.)An example for a saturated fatty acid, presents in nature is (a.) Oleic acid (b.) Linoleic acid (c.) Linolenic acid (d.) Palmitic acid
(17.)Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories? (a.) A co-enzyme (b.) A hormone (c.) An enzyme (d.) An antibiotic (18.)Glucose is hydrolysed by zymase into (a.) Amino acids (b.) Alcohol (c.) Aromatic acids (d.) Dicarboxylic acid (19.)Glucose when treated with CH3OH in presence of dry HCl gas, gives α-and β-methylglucosides because it contains (a.) An aldehydic group (b.) a − CH2OH group (c.) A ring structure (d.) Five −OH group (20.)The change in optical rotation with time of freshly prepared solution of reducing sugar is known as (a.) Inversion (b.) Specific rotation (c.) Rotatory motion (d.) Mutarotation (21.)In alkaline medium, alanine exits predominantly as (a.) Anion (b.) Zwitter ion (c.) Cation (d.) Covalent form (22.)The only vitamin with metal atom in it (a.) Vitamin A (b.) Vitamin K (c.) Vitamin B12 (d.) Vitamin E (23.)The compound, which give a positive ninhydrin test and a negative Benedict’s solution test, is (a.) A monosaccharide (b.) A disaccharide (c.) A lipid (d.) A protein (24.)When adenine is attached to ribose sugar, it is called adenosine. To make a nucleotide from it, it would require (a.) Oxygenation (b.) Addition of a base (c.) Addition of phosphate (d.) Hydrogenation (25.)Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories? (a.) A coenzyme (b.) A hormone (c.) An enzyme (d.) An antibiotic (26.)Pick out the one which does not belong to the family (a.) Pepsin (b.) Cellulose (c.) Ptyalin (d.) lipase (27.)Which of the following biomolecules contain non-transition metal ion? (a.) Vitamin B12 (b.) Chlorophyll (c.) Haemoglobin (d.) Insulin (28.)The correct statement in respect of protein haemoglobin is that it (a.) Acts as an oxygen carrier in the blood (b.) Forms antibodies and offers resistance to diseases (c.) Function as a catalyst for biological reactions (d.) Maintains blood sugar level (29.)Which of the following doesn’t form an oxime? (a.) Glucose (b.) Glucose pentaacetate (c.) Arabinose (d.) Galactose (30.)If α-D-glucopyranose is reacted with acetic anhydride at 373 K, the major products is the β- isomer of the pentaacetate. It is attributed to (a.) Isomerisation of α-D into β-D-glucose at 373 K (b.) Opening of glucopyranose ring (c.) Both the statements are correct (d.) None of the statement is correct (31.)The nucleic acid base having two possible binding sites is (a.) Thymine (b.) Cytocine (c.) Guanine (d.) Adenine (32.)A tripeptide is composed equally of L-valine, L- tryosine and L-alanine (one molecule of each). How many isomeric tripeptide of this kind may exist? (a.) 3 (b.) 4 (c.) 6 (d.) 8 (33.)Iso-electric is a (a.) Specific temperature (b.) Suitable concentration of amino acid
(c.) Hydrogen ion concentration that does not allow migration of amino acid under electric field (d.) Melting point of an amino acid under the influence of electric field (34.)Which of the following set consists only of essential amino acids? (a.) Alanine, tyrosine, cystine (b.) Leucine, lysine, tryptophane (c.) Alanine , glutamine, lycine (d.) Leucine, proline, glycine (35.)An organic compound consumes 4 moles of periodic acid to form following compounds, per mole of the starting compounds HCHO, 3HCOOH and CHOCOOH. The organic compound is (a.) Glucose (b.) Fructose (c.) Gluconic acid (d.) Sorbitol (36.)The vector for genetic code is called (a.) Messenger RNA (b.) Transfer RNA (c.) Ribosomal RNA (d.) Viral DNA (37.)Polypeptides having, molecular weights, above 10000 are known as (a.) Amino acids (b.) Hormones (c.) Proteins (d.) Terminal amino acids (38.)The process used in conversion of triolein to tristearin is (a.) Hrdrolysis (b.) Hydration (c.) Hydrogenation (d.) Dehydrogenation (39.)The best source of vitamin A is (a.) Wheat (b.) Beans (c.) Carrots (d.) Oranges (40.)A diabetic person carries a packet of glucose with him always because (a.) Glucose reduces the blood sugar level slowly (b.) Glucose increases the blood sugar level slowly (c.) Glucose reduces the blood sugar level (d.) Glucose increases the blood sugar level almost- instantaneously. (41.)The total number of basic groups in the following form of lysine is (a.) 1 (b.) 2 (c.) 3 (d.) 4 (42.)An example of a protein which acts as a hormone is (a.) Casein (b.) Oxytocin (c.) Trypsin (d.) Keratin (43.)Which one of the following structure represents the peptide chain? (a.) (b.) (c.) (d.) (44.)In an alkaline medium, Glycine predominantly exists as/in a/an (a.) Cation (b.) Anion (c.) Zwitter ion (d.) Covalent form (45.)The secondary structure of a protein refers to (a.) α −helical backbone (b.) Hydrophobic interaction (c.) Sequence of α −amino acids (d.) Fixed configuration of the polypeptide backbone (46.)When glucose reacts with bromine water the main product is (a.) Acetic acid (b.) Saccharic acid (c.) Glyceraldehydes (d.) Gluconic acid (47.)The α −amino acid which doesn’t give purple colour in the ninhydrin test is (a.) Proline (b.) Glycine
(c.) Lysine (d.) Aspartic acid (48.)If one strand of DNA has the sequence ATCGTATG, the sequence in the complementary strand would be (a.) TAGCTTAC (b.) TCACATAC (c.) TAGCATAC (d.) TACGATAC (49.)Which of the following statement (s) is/are true? (i) All amino acids contain one chiral centre (ii) Some amino acids contain one, while some contain more chiral centre or even no chiral centre (iii) All amino acids in protein have L-configuration (iv) All amino acids found in proteins have 1° amino group (a.) (ii), (iii)and (iv) (b.) (ii) and (iii) (c.) (i), (iii) and (iv) (d.) (i) and (iv) (50.)Number of chiral carbon atoms in β −D-(+)- glucose is (a.) Five (b.) Six (c.) Three (d.) Four (51.)The enzyme pepsin hydrolyses (a.) Proteins to amino acids (b.) Fats to fatty acids (c.) Glucose to ethyl alcohol (d.) Poloysaccharides to monosaccharides (52.)A nucleoside on hydrolysis gives (a.) A heterocyclic base and orthophosphoric acid (b.) An aldopentose, a heterocyclic base and orthophosphoric acid (c.) An aldopentose and a heterocyclic base (d.) An aldopentose and orthophosphoric acid (53.)Complete hydrolysis of cellulose gives (a.) D-fructose (b.) D-ribose (c.) D-glucose (d.) L-glucose (54.)Which is false (a.) Glucose is a disaccharide (b.) Starch is a polysaccharide (c.) Glucose and fructose are not anomers (d.) Invert sugar consists of glucose and fructose (55.)Charagaff’s rule states that in an organism (a.) Amount of adenine (A) is equal to that of thymine (T) and amount of guanine (G) is equal to that of cytocine (C) (b.) Amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of guanine (G) (c.) Amount of adenine (A) is equal to that of cytocine (C) and the amount of thymine (T) is equal to that of guanine (G) (d.) Amount of all bases are equal (56.)α −maltose consists of (a.) One α −D-glucopyranose unit and one β −D- glucopyranose uniy with 1-2 glyosidic linkage (b.) Two α –D-glucopyranose units with 1-2 glycosidic linkage. (c.) Two β-D-glucopyranose units with 1-4 glycosidic linkage (d.) Two α −D-glucopyranose units with 1-4 glycosidic linkage (57.)DNA template sequence of CTGATAGC is transcribed over m-RNA as (a.) GUCTUTCG (b.) GACUAUCG (c.) GAUTATUG (d.) UACTATCU (58.)Which one of the following is a conjugated protein? (a.) Phosphoprotein (b.) Glycoprotein (c.) Chromoprotein (d.) All of these (59.)The letter ‘D’ in D-glucose signifies (a.) Configuration at all chiral carbons (b.) Dextrorotatory (c.) That it is a monosaccharide (d.) Configuration at a particular chiral carbon (60.)The enzymes which have control site in addition to active site are called (a.) Holozymes (b.) Coenzymes (c.) Apoenzymes (d.) Allosteric enzymes (61.)Which is capable to self replication? (a.) Enzymes (b.) DNA polymerase (c.) DNA ligase (d.) DNA (62.)Histidine, a heterocyclic amino acid has following structure at pH < 1.82 At pH > 1.82, it should have which structure?