MDCAT Biology Online Test With Answers

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MDCAT Biology Online Test

Sr. # Questions Answers Choice
1 Mutation of one or two N-bases is Inversion Point mutation Deletion Chromosomal aberrations
2 Which enzyme deficiency leads to phenylketonuria Phenylalanine oxidase Phenylalanine hydroxylase Phenylalanine synthase Phenylalanine carboxylase
3 Point mutation occurs in Sickle cell anemia Phenylketonuria Alkaptonuria All
4 Homogenetistic acid is oxidized rapidly when exposed to air, turning the urine White Purple Blue Black
5 A change in one or more bases of DNA, which results in the formation of an abnormal protein is Moulting Transformation Mutation Fission
6 Mutatuons are inherited only if they occur in the Gland cells Gametes Muscle cells Somatic cells
7 In case of sickle cell anemia, in place of glutamic acid, _________ is found Histidine Valine Proline Leucine
8 A phenotype which can't be expressed in heterozygous state but can only be expressed other in homo or hemi form, would be Dominant Bombay Recessive Ordinary
9 Interaction of two loci Pleiotropy Epistasis Dominance Differentiation
10 Two parents of blood group A had a child of blood group O, what will be percentage chances of having such child again 25% 50% 75% None
11 What is the probability of having albino child if father and mother both are carrier(Aa) 25% 30% 50% 75%
12 Rh factor is encoded by 2 genes which occupy 3 loci 3 genes which occupy 2 loci 2 genes which occupy 2 loci 3 genes which occupy 3 loci
13 What are chances for having Rh-ve baby if one parent is Rh+ve and (homozygous) and other is Rh-ve 25% 50% 100% 0%
14 Bilirubin Turns skin Yellow Damages brain cells Causes jaundice All of these
15 There are ________ total possible genotypes of blood group ABO system 3 4 6 7
16 Anti-Rh antibodies appear in plasma During first few months During last months Only when stimulated If Rh<sup>+</sup>individual mistakenly receives Rh<sup>-</sup>blood
17 Color blindness, haemophilia and gout form linkage group onj Chromosome 9 Chromosome 19 x-chromosome y-chromosome
18 If the distance of 20 map units is found among two linked loci what would be the percentage of cross gametes 40% 60% 20% 10%
19 If six cells out of 10, do crossing over what will be percentage of cross over gametes 60% 30% 40% 50%
20 Genes can be mapped on chromosomes on the basis of Sex linkage Assortment Recombination frequency Gene sequencing
21 Queen victoria was having which kind of haemophilia A B C None
22 What will be the risk of heamophilia in sons if father is haemophilic and mother is normal 0% 20% 25% 50%
23 Which can convert glucose to glucose 6 phosphate Hexokinase Glucokinase Phospho fructokinase Both a &amp; b
24 A blue cone monochormate Can perceivetwo colours Can't perceiveany colour Can perceive only blue colour Can perceive only red colour
25 Insulin receptors are present in Cytoplasm of muscle cells Cell membrane of liver cells Cell membrane of muscles and liver cells Cell membrane of all body cells
26 Degenerated testes are present in abdomen in which of these cases Down's syndrome Klinefelter's sysndrome Turner's syndrome Testicular ferminization
27 How many kinds of rhodopsins, a blue cone monochromate will have 3 2 1 No rhodopsins
28 A carrier mother for colour blindness does not have A normal boy A carrier boy A colour blind boy A normal daughter
29 Blood pressure is also an example of _______ trait Multifactorial Qualitative Single genic Both a &amp; b
30 Diabetes is the leading cause of Kidney failure Adult blindness Heart disease All of these
31 Pseudo-autosomal genes are present on X-chromosome Y-chromosome Both a &amp; b Autosomes
32 SRY in located at the tip of Short arm of X-chromosome Short arm of Y-chromosome Long arm of Y-chromosome Long arm of X-chromosome
33 The two linked genes A and B with a 30% recombination frequency must be 15 units apart 30 units apart 60 units apart 90 units apart
34 Man has ____________ linkage group 23 21 25 46
35 The chances of which hemophilia is equal in males & females A B C All
36 Modern man has been on this planet for about 4000 years 400,000 year 40,000 years 50,000 years
37 We are reducing natural 'carbon dioxide's Sources Sinks Both None
38 Chlorofluorocarbons are Organic Inorganic Intermediate Solid
39 Which oxides causes headache and brain damage Nitrogen Lead CO<sub>2</sub> CO
40 How plants are deprived of nutrients by acid rain Due to teaching Due to fall in pH Acid creates a barrier to absorption Unknown cause
41 What is cause of Eutrophication Excreta Phosphate Nitrates All
42 Green house effect, acid rain headaches and coughs are related to which of the followings? Oxides of nitrogen Oxides of sulphur CO CFCs
43 Some ______ years ago human population and conversion of land to agricultural production began 10,000 40,000 5000 None
44 One atom of chlorine can destroy up to ___________ ozone molecules? One million One billion One thousand Two million
45 Which of these diseases is not infectious? Measles Influenza Pneumonia Tetany
46 Air conditioners are the source of Effluents SO<sub>2</sub>,NO<sub>2</sub> Heavy metals CFCs
47 Which element is the most potent source for the depletion of ozone layer Chlorine Fluorine Carbon All of them
48 Global warming is the result of Ozone layer depletion Acid rain Green house gases All of them
49 Oxides of nitrogen are produced by burning of Carbonate Leaded patrol Fossil fuels All of above
50 Population of Pakistan was ________ in 1947 23.5 million 30 million 32.5 million 40 million
51 Topography is study of? Population Individula Earth birds
52 The deficiency of which one of the following is cause of goiter Iodine Calcium Potassium Iron
53 Aerosol spray foams are potential sources of Carbon monoxide Sulphur dioxide Chlorofluorocarbons (CFCs) Lead compounds
54 Man depends foams are potential sources of Carbon monoxide Sulphur dioxide Chlorofluorocarbons (CFCs) Lead compounds
55 Dams and canal networks developed for irrigation purpose in Pakistan and many other countries create the problems of Salinity and soil erosion Salinity and water logging Soil depletion and water erosion Soil erosion and depletion
56 Excessive ploughing of lands in arid regions results in the development of Forest Deserts Grassland Fields
57 About 20 years ago what was the rate at which human population was increasing 1% 2% 3% 5%
58 The study of human population and factor affecting it is called Population census Population dynamics Demography Etymology
59 Hemophilia is a ________ disease Heritable Genetic Nutritional deficiency Both a and b
60 Monoculture is One organism A lab culture A pure culture Both b and c
61 Cloud cover is reduced due to Reforestation Afforestration Deforestration Air pollution
62 What are the environmental buffers? Trees Animals Factories Microbes
63 Establishment of new forest at places where no forests existed previously is called Reforestation Afforestration Deforestration Both a and b
64 Which disease is due to nutritional deficiency Scurvy Diabetes Herpes Diphtheria
65 Enrichment of water bodies by organic nutrients is called Organic pollution Eutrophication Sewage pollution Dtergents pollution
66 Taj Mahal's marble has been affected by CFC's Lead pollution Acid rain None
67 The purest form of global warming is in the shape of Disease Flood Acid rain All of these
68 Ozone is present at about ________ km above earth 5 -10 10 - 20 10 - 40 10 - 50
69 Acid rain is mainly due to SO<sub>2</sub> NO<sub>2</sub> Lead components Both a and b
70 Global warming is due to CFC's SO<sub>2</sub> O<sub>3 </sub>depletion CO<sub>2</sub>
71 Pyramid always starts at T<sub>1</sub> T<sub>2</sub> T<sub>3</sub> T<sub>4</sub>
72 Nutrient elements become the part of protoplasm during Photosynthesis Decomposition Fixation Assimilation
73 It is community relay Niche Evolution Speciation Succession
74 Which can't increase their weight in inorganic medium Producer Consumer Decomposer Both b &amp; c
75 Which eat consumers Predators Carnivores Omnivores All
76 Omnivores are described by how many trophic levels Any 2 Any 3 Any 1 Primary &amp; any higher
77 Leech is preferably a Host Parasite Predator Mutualist
78 Which is not a seral stage Climax forest Moss Shrub None
79 The oxidation of ammonia is Ammonification Nitrogen fixation Nitrification Denitrification
80 Overgrazing Promotes salinity Promotes erosion Promotes grasses Inhibits dicot competitors
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