MDCAT Biology Online Test With Answers

MDCAT Biology Online Test

Sr. # Questions Answers Choice
1 Which of the following helps in recognition of substrate Active site Catalytic site Binding site All
2 Slight change in pH can cause Denaturation Crystallization Ionization<span style="white-space:pre"> </span> All
3 Enzymes present in human body generally have Same optimum temperature and optimum pH Same optimum temperature but different optimum pH Same optimum pH but different optimum temperature Different optimum temperature and optimum pH
4 Which of the following kind of inhibitors don’t compete for active site of enzyme Irreversible competitive Reversible competitive Reversible non competitive Both b and c
5 The specificity of enzymes is due to their High molecular weight pH sensitivity Hydrogen bonding Surface configuration
6 Function of succinic dehydrogenase is aided by Metal ion Vitamin NAD FAD
7 Prosthetic groups are Radicals Inorganic molecules Organic molecules Metal ions
8
Phosphorylation of glucose molecule in glycolysis is carried out by
 ATPase Kinase Isomerase Transferase
9 Allosteric enzymes have ___ major sites 1 2 3 4
10 Potentially damaging enzymes are produced in Active form Inactive form Abundant quantity Minor quantity
11 Succinic acid differs from malonic acid by OH CH<sub>2</sub> CH<sub>3</sub> CHO
12 Succinic acid is the ____ of succinic dehydrogenase which undergoes____ Active site, reduction Prosthetic group, reduction Substrate, oxidation Substrate, reduction
13 Succinic acid dehydrogenase +succinic acid and high concentration of malonic acid? Maleic acid Fumaric acid No reaction Oxalic acid
14 Catalase and chymotrypsin have similar Substrate Product Optimum pH Metabolic impact
15 Which of the following is not affected by enzymes Nature and properties of end products Nature and properties of reactants Speed of biochemical reaction Efficiency of biochemical reaction
16 Ribozyme is found in Mitochondria Cytoplasm Lysosomes Ribosomes
17 The term enzyme was coined from a Greek word which means In yeast In grapes In apple In bacteria
18 Following enzymes are indicating the specificity of their action in their names, except Sucrase Amylase Pepsin Lipase
19 Which of the following is an example of ribozyme Aminopeptidase Pancreatic lipase Peptidyl transferase Cytochrome oxidase
20 Flavin adenine dinucleotide is a Prosthetic group Activator Coenzyme Inhibitor
21 By adding _______in neutral pH, we get the optimum pH of pancreatic lipase 1 2 3 4
22 Which one of the following enzymes have slightly acidic pH as optimum pH? Sucrase Enterokinase Pepsin Catalase
23 The inhibitor having structural similarity with substrate is Irreversible inhibitor Reversible inhibitor Competitive inhibitor Noncompetitive inhibitor
24 ____can be checked by increasing substrate concentration Reversible inhibition Irreversible inhibition Noncompetitive inhibition Competitive inhibition
25
Optimum pH for digestive enzymes of stomach is

 Highly acidic Highly alkaline slightly acidic slightly alkaline
26 Change in temperature from 30o C to 40o C in human body will cause ____ in rate of reaction Increase Decrease First increase then decrease First increase then constant
27 If substrate concentration is unlimited, rate of enzyme action becomes Inversely proportional to enzyme concentration Directly proportional to enzyme concentration Directly proportional to substrate Concentration <div>Inversely proportional to substrate</div><div>Concentration</div>
28 At high substrate level, all the active sites of enzyme are Destroyed Available Degenerated Occupied
29 Optimum pH of all human enzymes is Variable Same Acidic Alkaline
30 Formation of ES complex activates the______ site of an enzyme Active Binding Catalytic Allosteric
31 An activated enzyme consisting of polypeptide and cofactor is called as Activator Apoenzyme Holoenzyme Coenzyme
32 Many enzymes are simply dissolved in the Nucleoplasm Stroma of chloroplast Cytoplasm Matrix of mitochondria
33 ______form the raw material for coenzyme Nucleic acid Lipids Vitamins Proteins
34 Which of the following acts as a bridge between enzyme and substrate? Activator Cofactor Prosthetic group Apo-enzyme
35 Nicotinamide adenine dinucleotide is an example of Cofactor Coenzyme Prosthetic group Nucleotide
36 The rate of enzyme action will be minimum at Optimum pH Optimum temperature Optimum conditions Maximum temperature
37 The competitive inhibitor competes with the Enzyme Cofactor Substrate Coenzyme
38 The enzyme that works best at intermediate pH is Pepsin Chymotrypsin Sucrase Pancreatic lipase
39 Following substances can act as inhibitors, except Cyanide Antimetabolites Antibodies Poisons
40 The optimum temperature for most of the enzymes in human body is 37 <sup>o</sup>C 35<sup> o</sup>C 37 <sup>o</sup>F 98.6<sup> o</sup>C
41 Enzyme works to its maximum capacity At high temperature At low temperature At moderate temperature At optimum temperature
42 Which of the following is Koshland model Active site is rigid Active site may be molded to précised shape Position of active site is moveable None
43 Pick up the correct statement according to induced fit model of enzyme action Enzyme induces changes in substrate structure Substrate induces changes in enzyme structure Active site of enzyme is a rigid structure Active site of enzyme is used as a template +
44 Enzymes cannot work in which of the following Aqueous medium Dry medium Acidic medium Alkaline medium
45 If non protein part is covalently bonded to the protein part of enzyme, it is known as Coenzyme Prosthetic group Activator Cofactor
46 Inorganic ions can play a role of ¬¬¬¬¬¬¬______ in enzyme catalysis Coenzyme Inhibitor Apo enzyme Cofactor
47 Both ____ and ____ are detachable cofactors Apoenzyme, holoenzyme Activator, coenzyme Coenzyme, prosthetic group Prosthetic group, activator
48 Is is universally accepted by biologists that mammals have evolved from reptilian ancestors called ………… Cotylosaurs Dinosaurs Cotylostomata<span style="white-space:pre"> </span> Amphibians
49 Which of the following group of animals is a link between aquatic and terrestrial animals? Fish Amphibians Reptiles Birds
50 The cartilaginous fishes contain scales …. Placoid Cycloid Ganoid Ctenoid
51 The pairs of gills present in cyclostomata are 5-7 10-12 6-14 4-5
52 Notochord is present throughout life in Urochordates Chordates Cephalochordates Vertebrates
53 Circulatory system is open type in all of the following, EXCEPT Arthropoda Bivalvia Gastropoda Cephalopoda
54 Syrinx produces voice in birds. It is located In voice box Near origin of bronchi At the upper end of trachea Inside lungs
55 Pick up the most developed coelomates Echinoderms Annelids Chordates Insects
56 Pre-chordates is another name used for Echinoderms Protochordates Cephalochordates Hemichordates
57 Radial symmetry is present in Adults of annelida Adults of echinodermata Adults of Cnidaria Both B and C
58 Skeleton of echinoderms is originated from Ectoderm Endoderm Mesoderm Epidermis
59 Most of the vectors for spreading important human diseases belong to: Radiata Acoelomates Pseudocoelomates Coelomates
60 Parapodia are organs of locomotion in …… Leech Planaria Earthworm Neries
61 Common housefly is involved in spread of all diseases except Hepatitis Malaria Dysentery Cholera
62 Vector for spread of African sleeping sickness is Anopheles Commonhouse fly Tse-tse fly Honey bee
63 Which of the following has chitinous cuticle in the exoskeleton Arthropoda Porifera Echinodermata Annelida
64 The larva formed during the life cycle of Annelida is Glochidium larva Bipinnaria larva Trochophore larva Tornaria larva
65 Snails are the intermediate hosts of Fasciola hepatica Schistoma Taenia solium Ancyclosoma duodenale
66 Body of _____ consists of segments called proglottids which contains mainly sex organ Planaria Fasciola Ascaris Tapeworm
67 _____ is a good example of polymorphism Hydra Obelia Starfish Euplectella
68 The most common animal of phylum Aschelminthes is: Enterobuis vermicularis Ascaris lumbricoides Ancylostoma duodenale Rhabditis
69 Platyhelminthes have Asymmetrical body Radial symmetry Bilateral symmetry Diploblastic organization
70 Triploblastic, unsegmented, acoelomates exhibiting bilateral symmetry and reproducing both asexually and sexually, with some parasitic forms are included in Annelida Arthropoda Platyhelminthes Cnidaria
71 Animals that have their body cavity filled with parenchyma are Acoelomates Coelomates Pseudocoelomates Tunicates
72 Which characteristic is common in both cnidarians and flatworms Digestive system with a single opening Dorsoventrally flattened bodies Radial symmetry Flame cells
73 First invertebrate to develop a nervous system is Sponges Cnidarians Flat worms Round worms
74 Animals involved in the construction of corals are Polyps Medusae Gonozooids None
75 Which of the following is true about mesoglea Acellular Mesodermal Cellular Multicellular
76 A group of animals with distinct germinal layers in adult stage are grouped in Cnidaria Arthropoda Aschelminthes Platyhelminthes
77 It is an animal, but it does not have nerve or muscle tissue. It is neither diploblastic nor triploblastic. It is probably a Flatworm Nematode Cnidarian Sponge
78 Phylum of asymmetrical animals is Nematoda Platyhelminthes Cnidaria Porifera
79 Which of the following is a distinguishing character of sponges Tentacles<span style="white-space:pre"> </span> Ceoleteron Choanocytes Calcareous skeleton
80 Highest degree of regeneration is present in sponges because of Undifferentiated cells Simplest organization Ability to reproduce Absence of germ layers
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