We have collected Past mcqs of Biology from NUMS Past papers . Practice these ones for your National MDCAT as NUMS (medical entry test) will take your test .More Past mcqs related to chemistry will be updated here. We are going to upload past mcqs of other subjects, soon. So stay in touch.
1. Solubility of fatty acids in organic solvents and their melting points increases with:
A) Decrease number of carbon atoms in chains
B) Decrease number of triple bonds in chains
C) Increase number of hydrogen atoms in chains
D) Increase number of carbon atoms in chains
2. Which of the following combination is NOT the part of an animal cell?
A) Central vacuole, cell membrane, ribosome
B) Chloroplast, ribosome, mitochondrion
C) Cell wall, chloroplast, central vacuole
D) Ribosome, mitochondrion, cell wall
3. Chlorophyll molecule resemble the haem group of hemoglobin, the main difference between these
two molecules is that chlorophyll has____ ion
A) Fe2+
B) Mg2+
C) Mn2+
D) Ca2+
4. According to Hardy-Weinberg theorem, what will be the frequency of heterozygote when “r” is 0.27
A) 0.32
B) 0.38
C) 0.42
D) 0.48
5. Genetic code is a ____ code and out of 64 codons,_____ are nonsense codons
A) Single; two
B) Single; three
C) Triplet; two
D) Triple; three
6. The inner membrane of mitochondrion has many infoldings into the inner chamber, these folding are
called as:
A) Cristae
B) Cristernae
C) Matrix
D) F1 particles
7. All of the following hormones are secreted from anterior lobe of pituitary gland BUT?
A) Somatotropin hormone
B) Thyroid stimulating hormone
C) Antidiuretic hormone
D) Gonadotrophic hormones
8. Lactic acid fermentation is a type of enerobic respiration that occurs in human muscles cells, it yields
only___ % of the energy present in a glucose molecule.
A) 1
B) 2
C) 3
D) 4
9. When hydroxyl group of carboxyl group of one amino acid linked with hydrogen of amino group of
another amino acid,____ released and peptide bond is formed
A) NH2
B) CO2
C) H2O
D) O2
10. Which one of the following helps the enzyme to recognize and bind to a specific substrate, to produce an ES complex?
A) Binding site
B) Catalytic site
C) Co-factor
D) Prosthetic group
11. During DNA replication____ attaches the fragment to the lappind afraid
A) Ligase
B) Invertase
C) Heplicase
D) Tapolomerase
12. Which of the following are composed of proteins only which contain the information that codes for
their swift replication?
A) Virus
B) Virion
C) Prions
D) Capolids
13. Which of the following is NOT true for meiosis?
A) Number of chromosomes reduced to half
B) It takes place at the time of spore formation in plants
C) It takes place at the time of growth in animals
D) Two consecutive cell divisions are involved in it
14. In plants____ hormone promotes closing of stomata in dry conditions
A) Ethene
B) Gibberellin
C) Cytokines
D) Abscisic acid
15. Locus is defined as
A) Position of a gene are the chromosome
B) Appearance of a trait in an individual
C) Partner of a gene pair
D) Gene is an individual for a trait
16. Which of the following can be blocked, if one wants to stop translation of mRNA?
A) RNA polymerase
B) Helicase
C) Elongation factor
D) Primase
17. Ribose sugar that is main part of RNA is a type of _____sugars
A) Triose
B) Tetrose
C) Pentose
D) Hexose
18. Beadle and Tatum exposed Neurospora spores to____ radiations to check the mutations
A) Gamma
B) Infrared
C) Ultraviolet
D) X-rays
19. The ____ may be ca cell, neutron ending or an organ that receive the stimulus
A) Effector
B) Receptor
C) Adaptor
D) Stimulus
20. Name the part marked as X?
A) Sinoatrial node
B) Atrioventricular node
C) Sinoventridular mode
D) Atrioatrial node
21. Sphincter muscle in urinary system present near the junction of:
A) Pelvis ureter
B) Ureter nad urinary bladder
C) Urinary bladder nad urethra
D) Urethra and bladder
22. In a typical compound microscope the resolution of 2 um, which is about____ that of naked eye
A) 200x
B) 300x
C) 400x
D) 500x
23. Direction of reflex action is form:
A) Receptor to sensory neuron to motor neuron and then through associative neurons to effector
B) Receptor to sensory neuron to associative neuron and then through motor neurons to effector
C) Effector to sensory neurons to associative neuron and then through motor neurons to receptor
D) Effector to sensory neuron to motor neuron and then through associative neurons to receptor
24. In prokaryotes only one type of RNA polymerase is present while____ type of RNA polymerase are
present in eukaryotes
A) Two
B) Three
C) Four
D) Five
25. A single gene can by using:
A) DNA fingerprinting
B) Polymerase chain reaction
C) Get electrophoresis
D) Recombinant DNA technology
26. Many substances which are urgently required by the cell while cell absorbs them against the concentration gradient by utilizing energy in the form of:
A) ATP
B) Heat
C) GTP
D) Light
27. Which cannot be true for a man having B+ve blood group?
A) His mother’s blood group is BB
B) His mother’s blood group is Bo
C) His father’s blood group is AO
D) His father’s blood group is AA
28. FADH2 is produced during which step of Krebs cycle?
A) When isocitrate is converted into alpha-Ketoglutarate
B) When alpha ketoglutarate is converted into succinate
C) When succinate is converted into Fumarate
D) When fumarate is converted into Malate
29. Recent studies of HIV reveal that the virus infects and multiply in the ____ but does not cause
disease in them
A) Monkeys
B) Cats
C) Horses
D) Dogs
30. The main force which generate the blood pressure is vessels is contraction of:
A) Auricles of heart
B) Ventricles of heart
C) Arteries
D) Veins
31. In meiosis II _____ differentiate into sperms
A) Spermatocyte
B) Spermatids
C) Sertoli cells
D) Polar bundles
32. Ahmed’s blood cannot clot properly he was diagnosed with hemophilia A. he passed this trait to his
grandson through his
A) Wife
B) Son
C) Daughter
D) Brother
33. Exposure to____ light is effective in photosynthesis as it enables guard cells to take up K+ and peering of stomata
A) Red
B) Blue
C) Green
D) Orange
34. Which one is not a continuous trait?
A) Human height
B) Tongue rolling
C) Wheat grain color
D) Human skin color
35. The example of artificially induced active immunity is:
A) Exposure of actual infection
B) Injection of antiserum
C) Injection of antibiotics
D) Vaccinations
36. Which of the following of not true for gene used in recombinant DNA technology?
A) It can be isolated from chromosomes
B) It can be synthesize chemically
C) It can be made from protein
D) It can be made from mRNA
37. In the Calvin cycle, the reducing power from NADPH is used during
A) Formation of 1,3-bisphosphoglycerate
B) Conversion of 1,3-bisphosphoglycerate to Glyceraldehyde 3-phasphate
C) Formation of fructore 1-5 bisphoshate from 1,3-bisphosphoglycerate
D) Formation of glucose from fructose bisphosphate
38. The most common example of members of the kingdom fungi is/are:
A) Star fish
B) Mushrooms
C) Algae
D) Human
39. The water moves by osmosis from the nearby xylem is the sucrose containing sieve tube which increases the____ pressure of sieve tube element
A) Water
B) Solute
C) Hydrostatic
D) Hydrodynamic
40. Ovulation of induced by____ hormone secreted by pituitary gland
A) Follicle stimulating hormone
B) Estrogen
C) Luteinizing
D) Progesterone
41. Which of the following disease cannot be cures by gene therapy?
A) SCID
B) Tuberculosis
C) Cystic fibrosis
D) Cancer
42. Estimating relative CO2 consumption or O2 release during photosynthesis at different wave length
of light is termed as:
A) Action spectrum
B) Absorption spectrum
C) Dark reaction
D) Light reaction
43. The irritant substances of smoke cause smoker’s cough which weekens and surets
A) Branch
B)
C) Alveolil
D) Trachea
44. Repeating membrane potential of neuron is___ while during active membrane potential inner membrane surface isomers more___ than the outside
A) +70 mx ; negative
B) -70mx; negative
C) +70mx; positive
D) -70mx; positive
45. As gm of blood decrease ions increases which contains the proteins start of hemoglobin to decrease the ability to same with
A) O2
B) CO2
C) CO
D) H2
46. Cheat cavity is surrounded by muslces on the sides while the floor of cheat caviaty is called
A) Pleura
B) Alveoli
C) Chest cage
D) Diaphragm
47. The plant having thick outside needle like reduced leaves and sunken stomata are termed as
A) Hydrophytes
B) Neophytes
C) Halophytes
D) Xerophytes
48. Recent research indicated that more than__compound of bar of tobacco smoke are irritated in cancelling lung’s cancer
A) 05
B) 10
C) 50
D) 100
49. Due to the similarity of structure competitive inhibiters may be associated by the___- site, but are
not able to activate ___ site
A) Catalytic; binding
B) Positive; binding
C) Bindgin; active
D) Binding catalytic
50. The main cause of creation of tension between water molecules is____ which helps to make water
chain pulled up in ascent of sap
A) Reset pressure
B) Imbibition
C) Water potential
D) Hydrogen bonding
51. T-lymphocyte is names due to its relationship to____ gland, as its influences is essentials in making T cells immunologically competent
A) Thyroid
B) Thymus
C) Testes
D) Bursa
52. Muscle fiber has many____ and as turn chese have many____
A) Myofiber is sarcomeres
B) Myofiber is thin filaments
C) Myosin thin filaments
D) Mysosin sarcomeres
53. Which of the following offers an active barrier between the cell content and content and their environment by allowing single selective substances to pass through it?
A) Cell wall
B) Plasma membrane
C) Nuclear membrane
D) Vacuole
54. The specific heat capacity of water is the number of calories required to raise the temperature of water from___ C is 1 calorie
A) 15 to 16
B) 16 to 17
C) 15 to 20
D) 25 to 26
55. Which of the following blood vessel has/have valves which prevent backwards flow of blood?
A) Artery
B) Capillary
C) Vein
D) All of the above
56. In process of muscle contraction,____ is brought closer, ____ shortens nd ____ disappears
A) Z-lines, H-band, I-band
B) I-ban, Z-lines, H-zone
C) Z-line, I-band, H-zone
D) H-zone, I-band, Z-line
57. Eukaryotic multicellular and consumers belong to ___ kingdom
A) Monera
B) Protista
C) Fungi
D) Animalia
58. The smaller subunit (40s) of ribosome combines with larger subunit( 60S) in the presence of
Mg2+ ion to form__ particle
A) 100S
B) 90S
C) 80S
D) 70S
59. Neurotransmitter triggered action potential in the poet synaptic neuron by changing the permeability of certain___
A) Ions
B) Hormones
C) Enzymes
D) Proteins
60. If the week is heterozygous yellow(Y) in a test cross what will be the probability of appearance
of seed color?
A) 0% yellow, 100% green
B) 25% yellow, 75% green
C) 50% yellow, 50% green
D) 100% yellow, 0% green
61. Which of the following has the ability to develop ester linkage with OH group of pentose sugar?
A) Purine
B) Pyrimidines
C) H3PO4
D) HNO3
62. Muscles that are attached to bones and have voluntary movements are termed as___ muscle
A) Cardiac
B) Smooth
C) Skeletal
D) Hard
63. The oxidation of PGAL during glycolysis yields____ molecule
A) ATP
B) FAD
C) NADH
D) ADP
64. Particular array of chromosomes that an individual possesses is called its
A) Nucleosome
B) Gene pool
C) Karyotype
D) Centromere
65. Meselson and stahl experiment confirmed that DNA replicate in ____ manner
A) Conservative
B) Semi-conservative
C) Dispersive
D) New synthesis
66. Each β-chain of hemoglobin molecule contains ___ amino acids
A) 136
B) 146
C) 235
D) 285
Answers will be updated soon.
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