1.Malate is oxidized by (UHS MDCAT 2015)
- ATP
- NADP to oxaloacetate in Krebs’s Cycle.
- NAD
- FAD
Show answer
Correct answer: (c) NAD
Malate dehydrogenase passes the hydrogen to NAD.
83 MCQs from MDCAT 2015 in our bank, each with its correct answer and a solution. This is a recall-based collection gathered from students and past-paper books, not the complete official paper.
1.Malate is oxidized by (UHS MDCAT 2015)
Correct answer: (c) NAD
Malate dehydrogenase passes the hydrogen to NAD.
2.In electron transport chain, the electrons from NADH and FADH2 are passed to; (UHS MDCAT 2015)
Correct answer: (d) Co-enzyme Q
Both feed their electrons into coenzyme Q, which passes them along the chain.
3.Carriers of the respiratory chain are located on: (UHS MDCAT 2015)
Correct answer: (c) Inner membrane of mitochondria
The carriers sit in the inner mitochondrial membrane.
4.Monosaccharides are major components of: (UHS MDCAT 2015)
Correct answer: (c) DNA, NADP, ATP and Ribulose bisphosphate
Ribose and deoxyribose are the sugars of the nucleic acids, of ATP and of ribulose bisphosphate.
5.Which one of the following is an example of unsaturated fatty acid? (UHS MDCAT 2015)
Correct answer: (b) Oleic Acid
Oleic acid has a double bond in its chain; the others are saturated.
6.Fluid mosaic model of plasma membrane states that protein molecules float in a fluid layer. (UHS MDCAT 2015)
Correct answer: (b) Phospholipids
The proteins float in a bilayer of phospholipid, which is what makes the model a fluid mosaic.
7.Blood group antigen contains: (UHS MDCAT 2015)
Correct answer: (a) Glycoproteins
The A and B antigens are the sugar chains of glycoproteins on the red cell surface.
8.How many triplets of microtubules are present in centriole? (UHS MDCAT 2015)
Correct answer: (c) Nine
A centriole is nine triplets of microtubules.
9.Ribosomes are tiny organisms, which are involved in the synthesis of: (UHS MDCAT 2015)
Correct answer: (a) Protein
Ribosomes are where protein is made.
10.Which organelle is bounded by two membranes? (UHS MDCAT 2015)
Correct answer: (b) Mitochondria
A mitochondrion has an outer membrane and a folded inner one.
11.At the beginning of nuclear division, the number of microtubule triplets in two pairs of centrioles that migrate to opposite poles are: (UHS MDCAT 2015)
Correct answer: (d) 36
Each centriole is nine triplets, and two pairs make four centrioles, that is thirty-six triplets.
12.During maternal mitosis, non-disjunction of autosomal chromosome pair results in the formation of an egg having 24 chromosomes in: (UHS MDCAT 2015)
Correct answer: (b) Down’s Syndrome
An egg with an extra chromosome 21 gives a child with three of them.
13.Typical symptoms like enlarged breasts and small testis in male are attributed to: (UHS MDCAT 2015)
Correct answer: (c) Klinefelter’s Syndrome
Klinefelter syndrome is XXY, with an extra X in the male.
14.Turner’s syndrome is characterized by having: (UHS MDCAT 2015)
Correct answer: (d) 44 + XO
Turner syndrome is a single X with no partner.
15.Number of pairs of autosomes in humans in: (UHS MDCAT 2015)
Correct answer: (d) 22
Of the twenty-three pairs, twenty-two are autosomes and one is the sex pair.
16.Neurotransmitter secreted at synapse outside the central nervous system is: (UHS MDCAT 2015)
Correct answer: (d) Acetylcholine
Acetylcholine is the transmitter of the neuromuscular junction and the autonomic ganglia.
17.Conduction of action potentials from one mode of Ranvier to another in myelinated neurons is through: (UHS MDCAT 2015)
Correct answer: (d) Saltatory Conduction
The impulse leaps from node to node, which is saltatory conduction.
18.Some enzymes require helper which is non-protein part for its efficient functioning that is called: (UHS MDCAT 2015)
Correct answer: (b) Cofactor
A non-protein part an enzyme needs is a cofactor.
19.Which molecular structure of enzyme is essential for activity of enzyme? (UHS MDCAT 2015)
Correct answer: (d) Tertiary Structure
The folded tertiary shape is what makes the active site, so activity depends on it.
20.Pepsin, protein digesting enzymes, sets best pH: (UHS MDCAT 2015)
Correct answer: (c) 2.00
Pepsin works in the acid of the stomach, at about pH 2.
21.Which one of the following is an example of competitive inhibitor? (UHS MDCAT 2015)
Correct answer: (d) Melonate
Malonate resembles succinate closely enough to occupy the active site of the dehydrogenase.
22.From evolutionary point of view, which respiratory protein is common in many organisms? (UHS MDCAT 2015)
Correct answer: (c) Cytochrome c
Cytochrome c is found in almost every aerobic organism, and its sequence traces their relationships.
23.In human testis, which structure is responsible for carrying sperm from inside the testis? (UHS MDCAT 2015)
Correct answer: (d) Vasa efferentia
The vasa efferentia carry the sperms from the testis to the epididymis.
24.In which part of female reproductive system fertilization takes place? (UHS MDCAT 2015)
Correct answer: (a) Proximal part of oviduct
Fertilization happens in the upper third of the oviduct.
25.In females, FSH stimulates the ovary to produce: (UHS MDCAT 2015)
Correct answer: (c) Oestrogen
FSH ripens the follicle, and the growing follicle secretes oestrogen.
26.In which phase of human female menstrual cycle, endometrium prepares for the implantation of embryo? (UHS MDCAT 2015)
Correct answer: (c) Secretory phase
In the secretory phase progesterone thickens the lining and fills its glands.
27.Ejection of milk from mammary glands is under the control of which one of the following hormones? (UHS MDCAT 2015)
Correct answer: (b) Oxytocin
Oxytocin contracts the muscle round the milk ducts and lets the milk down.
28.Syphilis, sexually transmitted disease is caused by: (UHS MDCAT 2015)
Correct answer: (b) Treponema pallidum
Syphilis is caused by Treponema pallidum.
29.The total number of cervical and thoracic vertebrate in human vertebral column is: (UHS MDCAT 2015)
Correct answer: (b) 19
Seven cervical and twelve thoracic vertebrae make nineteen.
30.A sarcomere is the region of a myofibril between two successive: (UHS MDCAT 2015)
Correct answer: (b) Z-lines
A sarcomere runs from one Z line to the next.
31.The sarcolemma of muscle fibre folds inwards and forms a system of tubes which runs through the sarcoplasm called: (UHS MDCAT 2015)
Correct answer: (d) Transverse tubules
The infoldings of the sarcolemma are the transverse, or T, tubules.
32.According to sliding filament theory, when muscle fibers are stimulated by nervous system, which of the following changes occurs? (UHS MDCAT 2015)
Correct answer: (a) I-bands shorten
The thin filaments slide in, so the I band and the H zone narrow while the A band holds its length.
33.If lactic acid build up in thigh muscles, it causes muscle tiredness and pain. This condition is called: (UHS MDCAT 2015)
Correct answer: (a) Muscle Fatigue
Lactic acid built up in a working muscle brings on muscle fatigue.
34.Human skin colour is a good example of? (UHS MDCAT 2015)
Correct answer: (b) Polygenic inheritance
Skin colour is set by several genes together, which is polygenic inheritance.
35.ABO blood system is an example of: (UHS MDCAT 2015)
Correct answer: (c) Multiple Alleles
The ABO system has three alleles, of which each person carries two.
36.X-linked recessive trait is: (UHS MDCAT 2015)
Correct answer: (c) Haemophilia
Haemophilia is carried on the X chromosome and is recessive.
37.Right atrium is separated from right ventricle by: (UHS MDCAT 2015)
Correct answer: (c) Tricuspid Valve
The tricuspid valve guards the right atrioventricular opening.
38.The flaps of tricuspid valves are attached to muscular extensions of right ventricle known as: (UHS MDCAT 2015)
Correct answer: (b) Papillary Muscles
The chordae tendineae run from the papillary muscles to the cusps.
39.One complete heart beat consists of one systole and one diastole and lasts for about: (UHS MDCAT 2015)
Correct answer: (a) 0.8 sec
At seventy-five beats a minute one cycle lasts $0.8\,\mathrm{s}$.
40.The heart beat cycle starts when electric impulses are generated from; (UHS MDCAT 2015)
Correct answer: (c) SA Node
The sinoatrial node is the pacemaker.
41.In response, β-cells produce plasma cells that synthesize antibodies and release in blood plasma and tissue fluid. (UHS MDCAT 2015)
Correct answer: (c) Humoral
Antibodies released into the body fluids carry the humoral response.
42.B-lymphocytes are named due to their relationship with: (UHS MDCAT 2015)
Correct answer: (b) Bursa of Fabricius
B cells were first found maturing in the bursa of Fabricius of the bird.
43.Response of body against the transplanted organ is: (UHS MDCAT 2015)
Correct answer: (d) Cell-mediated Response
The graft is attacked by T lymphocytes, so the rejection is cell mediated.
44.The hormone which inhibits the secretion of pancreatic juice is: (UHS MDCAT 2015)
Correct answer: (a) Secretin
Secretin calls out the alkaline pancreatic juice but damps down the enzyme secretion of the gastric glands.
45.Trypsinogen is activated to trypsin by: (UHS MDCAT 2015)
Correct answer: (b) Enterokinase
Enterokinase of the intestinal juice converts trypsinogen into trypsin.
46.The emulsification of fats is the role of: (UHS MDCAT 2015)
Correct answer: (d) Bile www.PakLearningSpot.com UNIVERSITY OF HEALTH SCIENCES, LAHORE Entrance Test – 2015 PakLearningSpot.com
Bile salts break the fat into a fine emulsion for the lipase.
47.Those nephrons which are present along the border of the cortex and medulla are called: (UHS MDCAT 2015)
Correct answer: (a) Juxtamedullary nephrons
The juxtamedullary nephrons sit at the border and send their long loops into the medulla.
48.When water is in short supply, increased water retention occurs through the: (UHS MDCAT 2015)
Correct answer: (c) Juxtamedullary nephrons
Only their long loops can build the gradient that lets water be drawn back.
49.In nephrons, counter-current multiplier occurs at: (UHS MDCAT 2015)
Correct answer: (a) Loop of Henle
The two limbs of the loop of Henle work against each other to multiply the gradient.
50.Ascending loop of Henle does not allow outflow of: (UHS MDCAT 2015)
Correct answer: (d) Water
The ascending limb is impermeable to water; it pumps out salt instead.
51.A larger quantity of dilute urine is produced in diabetes insipidus. This disease is due to the deficiency of: (UHS MDCAT 2015)
Correct answer: (a) Antidiuretic Hormone
Without antidiuretic hormone the collecting duct stays impermeable and a great deal of dilute urine is passed.
52.Water and sodium ions are reabsorbed in: (UHS MDCAT 2015)
Correct answer: (d) Proximal Convoluted Tubule & Collecting Duct
Most water and sodium return in the proximal tubule, and the rest under hormonal control in the collecting duct.
53.In cystic fibrosis, liposomes-microscopic vesicles are sued which are coated with: (UHS MDCAT 2015)
Correct answer: (a) Healthy Gene
The liposome carries a healthy copy of the gene into the cells of the airway.
54.The DNA formed by the reverse transcription is called: (UHS MDCAT 2015)
Correct answer: (c) cDNA
DNA made from RNA by reverse transcriptase is complementary DNA.
55.Bacterial cells take up recombinant plasmids when they are treated with: (UHS MDCAT 2015)
Correct answer: (a) CaCl2
Calcium chloride makes the wall permeable so the plasmid can enter.
56.Which one of the following is made up of radioactively labelled nucleotides? (UHS MDCAT 2015)
Correct answer: (d) Gene Probe
A gene probe is a labelled length of nucleic acid that pairs with the sequence sought.
57.A technique in transgenic animals in which desired gene is inserted into the eggs of animal is called: (UHS MDCAT 2015)
Correct answer: (b) Microinjection
Injecting the gene straight into the egg is microinjection.
58.Which one of the following edible products is widely pasteurized? (UHS MDCAT 2015)
Correct answer: (c) Milk
Milk is pasteurized to kill the pathogens without spoiling its taste.
59.10.0 grams of glucose are dissolved in water to make 100 cm3 of its solution, its molarity is: (UHS MDCAT 2015)
Correct answer: (a) 0.55
$10.0/180$ is $0.0555$ mole in $0.1\,\mathrm{dm^3}$, that is about $0.55\,\mathrm{M}$.
60.Given solution contains 16.0 g of CH3OH, 92.0 g of C2H5OH and 36 g of water. Which statement about mole fraction of the components is true? (UHS MDCAT 2015)
Correct answer: (b) Mole fraction of C2H5OH and H2O is the same
The amounts are $0.5$, $2$ and $2$ moles, so ethanol and water share the same mole fraction.
61.Which one of the following is the correct presentation for Ksp? AgCl Ag+ + Cl― [AgCl] (UHS MDCAT 2015)
Correct answer: (b) Ksp = [Ag+1] [Cl-1] +1 -1 ] [Cl ] [AgCl]
The solubility product is the product of the ionic concentrations; the solid does not appear in it.
62.Standard enthalpy of combustion of graphite at 25 oC is –393.51 kJ mol-1 and that of diamond is –395.41 kJ mol-1. The enthalpy change for graphite is: (UHS MDCAT 2015)
Correct answer: (d) +1.91
Subtracting the two combustion enthalpies leaves $+1.91\,\mathrm{kJ\,mol^{-1}}$ for graphite turning to diamond.
63.Keeping in mind the electrode potential, which one of the following reactions is feasible? (UHS MDCAT 2015)
Correct answer: (c) Fe + CuSO4 ZnSO4 + Mg FeSO4 + Cu
Iron stands above copper in the series, so it displaces copper from the sulphate.
64.Which one of the following is NOT able to denature the ethanol? (UHS MDCAT 2015)
Correct answer: (b) Lactic acid
Denaturing means adding something poisonous or foul; lactic acid is neither.
65.How will you distinguish between methanol and ethanol? (UHS MDCAT 2015)
Correct answer: (d) By Iodoform test
Ethanol has the $\mathrm{CH_3CH(OH)}$ grouping and gives iodoform; methanol does not.
66.To produce absolute alcohol (100%) from rectified spirit (95.6% alcohol), the remaining 4.4% water must be removed by a drying agent such as (UHS MDCAT 2015)
Correct answer: (a) Calcium oxide
Quicklime takes up the last of the water and leaves absolute alcohol.
67.Which one of the following was used as one of the earliest antiseptic and disinfectant? (UHS MDCAT 2015)
Correct answer: (a) Phenol
Phenol was Lister’s antiseptic, the first used in surgery.
68.Both aldehydes and ketones are planer to the neighborhoods of carbonyl (C=O) group. Which one of the following bonds is distorted towards the oxygen atoms? (UHS MDCAT 2015)
Correct answer: (a) π-bond of C and O
Oxygen is the more electronegative, so the loose pi electrons of the double bond are drawn towards it.
69.Haemoglobin is a (UHS MDCAT 2015)
Correct answer: (c) Transport protein
Haemoglobin carries oxygen, so it is a transport protein.
70.Polymide is formed due to the condensation od hexane-dioic acid with (UHS MDCAT 2015)
Correct answer: (b) Hexane-1,6-diamine
Nylon-6,6 is adipic acid condensed with hexane-1,6-diamine.
71.Which one of the following is an example of co-polymer? (UHS MDCAT 2015)
Correct answer: (a) Polyamide
A polyamide is built from two different monomers, so it is a copolymer.
72.In spite of all the torture, the police has failed to (UHS MDCAT 2015)
Correct answer: (b) Elicit
To elicit is to draw something out of somebody.
73.Youngsters who indulge in love affairs are usually (UHS MDCAT 2015)
Correct answer: (b) Addled
Addled means muddled or confused.
74.EMPATHY (UHS MDCAT 2015)
Correct answer: (d) Sympathy PLSPOT 14 of 20
Empathy is entering into another’s feeling, and of these sympathy is the nearest.
75.FELICITY (UHS MDCAT 2015)
Correct answer: (c) Happiness
Felicity is great happiness.
76.UNCANNY (UHS MDCAT 2015)
Correct answer: (d) Strange
Uncanny means strange in an unsettling way.
77.VIRULENT (UHS MDCAT 2015)
Correct answer: (b) Harmful
Virulent means severely harmful or poisonous.
78.RAPT (UHS MDCAT 2015)
Correct answer: (b) Bewitched
To be rapt is to be spellbound.
79.PEDAGOGY (UHS MDCAT 2015)
Correct answer: (b) The study of teaching methods
Pedagogy is the study of teaching.
80.INDICTMENT (UHS MDCAT 2015)
Correct answer: (c) Accusation
An indictment is a formal accusation.
81.MITIGATION (UHS MDCAT 2015)
Correct answer: (a) Alleviation
To mitigate is to make less severe, that is to alleviate.
82.CONCERTED (UHS MDCAT 2015)
Correct answer: (a) Strenuous
A concerted effort is a strenuous, combined one.
83.ARCANE (UHS MDCAT 2015)
Correct answer: (a) Mysterious
Arcane means hidden or mysterious.