MDCAT Chemistry Online Test With Answers

MDCAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Based on the physico-chemical properties, proteins may be classified into the following types Simple proteins Compound proteins Derived proteins All of the above
2 Which of the following bond is responsible for joining the amino acids in proteins? Metallic Bond Di sulfide bond Peptide Bond Peptide Bond
3 The enzyme which is found in saliva, accelerates the conversion of starch into sugar is Pepsin Thrombin Ptyalin Fumarase
4 The proteins which give an amino acid and non-protein group on hydrolysis are known as Derived protein Albumins Conjugated simple protein Conjugated protein
5 Glucose is converted into ethanol by the enzyme present in the yeast Urease Zymase Invertase Sucrase
6 The type of isomerism shown by alkyl halides is geometric functional positional metamerism
7 For a particular halogen, the reactivity of alkyl halides remains same with C-increase decreases with C-increase increases with C-increase decreases with C-decrease
8 An example of regulatory protein is nucleoprotein hemoglobin lactoglobulin thyroxine
9 UV rays inactivate enzymes because they change sequence of amino acids of enzymes They add prosthetic group to them They increase their specificity affect structure of enzymes
10 Simplest Structure of a protein that has only covalent bonding between amino acids is 2° structure 3°structure 1° structure 4° structure
11 Dehydrogenase is an example of ligase oxidoreductase lyase hydrolase
12 Proteins have linkage between amino acids imide amide ester ether
13 Amino acids react together to form the primary structure of proteins which is accompanied by addition of water addition of ammonia removal of ammonia removal of water
14 An element that is not an essential par of proteins is O N H S
15 The most complex strueture a single polypetide can assume is 1° structure 2°structure 3° structure 4° structure
16 Proteins loose their ability to work by slight heating by change in structure by slight cooling when inside the body
17 Enzymes consist of proteins only proteins and non-protein parts fats only futs and non-fatty components
18 Which of the following is not a property of enzymes? extraordinary speciffcity reversibility of reactions high efficiency minimum activity at optimum T
19 Alpha helix and beta pleated sheath are secondary structures of protein which are maintained by dipole forces non-polar interactions ionic bonds Hydrogen bonds
20
The enzymes that catalyse the addition or removal of ammonia are:
 Lyases Ligases Transferases Kinses
21 L-asparginase is helpful in treatment of skin disease blood cancer heart failure obstructive jaundice
22 Increased concentration of enzyme alkaline phosphatase is a sign of hemophilia heart disease thrombosis rickets
23 All are examples of different classes of enzymes except Hydrolases Isomerases Oxido-reductases Mutases
24 Succinic thiokinase is an enzyme of the type mutase peroxidase ligase lyase
25 An example of bydrolase is Amylase Lipase Fumarase A,C
26 Phosphoprotein comes under the type of proteins Simple protein Derived protein Conjugated Both A & B
27 The specifie substance (metabolite) that fits on the enzyme surface and is converted to products is called Co-factor Isoenzyme Prosthetic group Substrate
28 Collagen is a fibrous protein present most abundantly in heart nucleus connective tissues Arteries
29 The enzymes that bring about exchange of functional groups like phosphate are called Ligases Lyases Isomerases Transferases
30 Dehydrogenase is an erample of Transferase Hydrolase Lyase Oxido-reductase
31 Enzymes have been classified on the basis of protein structure prosthetic groups type of reaction they catalyse bonding in them
32 Fe+2 is the co-factor for Chrome oxidase Glucose-6-phosphatase Carbonic anhydrase Hydrolase
33 The protein component of enzyme ls called apoenzyme proenzyme holoenyme co-enzyme
34 The structure of protein helps protein to be in proper shape attach substrate perform is function All of these
35 An example of simple protein is lipoprotein Cholesterol lecithin globulin
36 Lactoglobulin is found in nucleus nerve cells Plants only muscles and in plants
37 Prosthetic groups are helical structures in protein sulphur containing parts of protein non-protein parts in compound proteins sites for hydrogen bonding
38 Enzymes are simple proteins derived proteins compound proteins conjugated proteins
39 Helical structure of proteins is stabilized by Peptide bond Dipeptide bond Van der Wall's forces Hydrogen bonding
40 Which of the following is the element not present in all proteins? Carbon Hydrogen Nitrogen Sulphur
41 Which of the following is not a category of proteins based upon their function? genetic Regulatory nucleo structural
42 Denaturation of proteins is often characterised by Loss of biological activity Aiways being irreversible Being ereater the lower the temperature Changes in primary structure
43 The most abundant protein in the human body is Collagen Keratin Myosin Albumin
44 In proteins, the alpha-helix and Beta-pleated sheet are examples of <sup>Primary Structure</sup> Secondary Structure Tertiary Structure Quaternary Structure
45 Abumins and globulins are defined as Derived protein Conjugated protein Fibrous protein Simple Protein
46 Third order of protein structure refers to Bending of protein chain Three-dimensional structure of protein Number and sequence of amino acids Site of disulphide bonds
47 Primar structure of proteins refers to Coling and folding in form of specilie structure 3d structure Number of amino acids in a chain Alpha and Beta sheets
48 When ethyl magnesium bromide is treated with carbon dioxide and the product hydrolyzed we get formic acid propionic acid oxalic acid acetic acid
49 Molar mass of formic acid in benzene comes out to be 64 46 32 92
50 Carboxylic acid is more acidic than phenol because of the greater stability of Carboxylic acid Phenoxide ion proton Carboxylate ion
51 The formation of acetic anhydride from acetic acid follows the mechanism SN AN SE AE
52 In esterification, the OH of carboxylic acid is replaced by OR+ R+ OR R
53 solubility of carboxylic acids decreases in water with increase in molar mass because Bigger molecules are more polar bigger molecules have bigger non-polar groups bigger molecules make more hydrogen bonds bigger molecules can form lesser hydrogen bonds/molecule
54 Which compound shows the highest melting point water Propanoic acid Methanoic acid Ethanoic acid
55 Propanoic acid is functional group isomer of Methyl acetate Ethyl acetate Propanal Proparone
56 Ethane nitrile can be converted into ethanoic acid through......intermediate Ethyl alcohol AcetyI chloride Acetamide Methyl cyanide
57 The highest melting point is observed by Butanoic acid Propanoic acid Pentanoie acid HCI
58 Final product of hydrolysis of nitrile is Ketone Alcohol Aldehyde Carboxylic acid
59 Which one of the following reaction of carboxylic acid is reversible? Esterification Salt formation Reaction with PCI5 Reaction with SOCI2
60 Formamide is formed by the reaction of which acid with ammonia Oualic acid Formic acid Ethanoic acid Propanoic acid
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