MCQs for AIIMS MBBS entrance exam

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Question 1

Appearance of dark-coloured pepper moths among the light-coloured ones as a result of increased industrial pollution is an example ofA disruptive selection
B stabilising selection
C directional selection
D None of the above

Question 2

A fruit developed from a condensed inflorescence isA simple fruit
B aggregate fruit
C composite fruit
D etaerio

Question 3

The ratio of osmotic pressure exerted by 1 M sucrose and 1 M NaCl solution will beA 1
B 2
C 0.1
D 0.5

Question 4

The main function of the white blood cell in the human intestine system is toA combat and destroy antigenic particles
B produce antigens to combat antibodies
C carry oxygen around the body
D transport antigens to B memory cells in the lymph nodes

Question 5

Which one of the following is the best stage to observe the shape, size and number of chromosomes in a cell?A Interphase
B Prophase
C Metaphase
D Telophase

Question 6

In the blood of an adult man the total content of hemoglobin is roughlyA several hundred grams
B tens of gram (10-100 g)
C several grams
D several hundred milligram

Question 7

Sinking of zooplankton during the day and rising to the surface at night is an example ofA circinal rhythm
B circadian rhythm
C tidal rhythm
D None of these
Question 8

Centre of DNA Fingerprinting and Diagnostics (CDFD) is located atA Delhi
B Chennai
C Kolkata
D Hyderabad

Question 9

The function of nitrogen fixation In Anabaena (cyanobacterium) is performed byA thylakoid
B heterocyst
C phycocyanin
D phycoerythrin

Question 10

In a bacterium, the amount of adenine was found to be 18 per cent. Suggest the cytosine base composition from the followingA 64%
B 36%
C 32%
D 18%

Question 11

pBR322, which is frequently used as a vector for cloning gene in E. coli is a/anA original bacterial plasmid
B modified bacterial plasmid
C viral genome
D transposon

Question 12

Holandric genes are locatedA both in X and Y-chromosome
B only in Y-chromosome
C only in X-chromosome
D only in autosomes

Question 13

In which of the following combinations, the compounds in ascending order based on their molecular weights are arranged?A DNA, RNA, AMP, ADP, ATP
B DNA, RNA, ATP, ADP, AMP
C AMP, ADP, ATP, RNA, DNA
D AMP, ATP, ADP, DNA, RNA

Question 14

Elaters are absent inA Funaria
B Marchantia
C Pellia
D Porella

Question 15

The callus is defined asA decaying cells
B differentiated cells
C sterile mass cells
D undifferentiated mass of cells

Question 16

Calcium dependent kinases can controlA cell cycle activities
B DNA replication
C cell surface receptors
D membrane structure

Question 17

Which of the following serve as the anchoring junctions between the cells?A Tight junctions
B Gap junctions
C Desmosomes
D Nexuses

Question 18

22. Blood cells that increase in number during allergic conditions like asthma areA neutrophils
B basophils
C eosinophils
D lymphocytes

Question 19

The cornea is a very important component of the human eye. The main function of the cornea is toA bend the light before it reaches the lens
B provide structural support to the eye
C contain a concentrated amount of cone cells in the correct orientation
D change the shape of the lens to enable the image to be focused on the retina

Question 20

Acoelomate, triploblastic body with bilateral symmetry is characteristic ofA flatworm
B roundworm
C segmented worm
D mollusc

Question 21

In a stable ecosystem, which of the following limits the number of trophic levels?A Biomass
B The number of nutrients
C Availability of nutrients
D Presence of contaminants that increase in concentration along the food chain

Question 22

Oxygen content reduction makes the glycolyse (glycogenesis) intensity increased due toA increase of ADP concentration in cell
B increase of NAD+ concentration in cell
C increase of ATP concentration in cell
D increase of concentration of peroxides and free radicals

Question 23
If a segment of an mRNA molecule has the sequence S’ GUACCGAUCG 3, which of the following could have been the template DNA molecule?A 5’ GCUAGCCAUG 3’
B 5’GUACCGAUCG 3’
C 5’ CATGGCTAGC 3’
D 5’ CGATCGGTAC 3’

Question 24

Hardy-Weinberg’s principle of ‘zero evolution’ is based onA genetic equilibrium
B random mating
C no migrations
D All of the above

Question 25

What does the term ‘reproductive isolation’ refers to?A An individual is unable to fertilize itself
B Genes are not exchanged between two populations
C Individuals from two populations never mate
D Individuals from two populations never produce offspring’s
Question 26

Below are listed some pairs of characters. The homologous pair isA forelimbs of dog and camel
B insect wing and bat wing
C feathers of birds and fins of fish
D lens of vertebrate and arthropod

Question 27

If Darwin’s theory of pangenesis shows similarity with theory of inheritance of acquired characters then what shall be correct according to it?A Useful organs become strong and developed while useless organs become extinct. These organs help in struggle for survival
B Size of organs Increase with ageing
C Development of organs is due to will power
D There should be some physical basis of inheritance

Question 28

LSD isA hallucinogenic
B sedative
C stimulant
D tranquiliser

Question 29

Monoclonal antibodies areA obtained from a cell and act on one antigen
B obtained from a group of cells and act on more than one antigens
C obtained from a group of same type of cells and act on single antigen
D obtained from a group of same type of cells and act on more than one antigens

Question 30

Which of these is most infectious disease?A Hepatitis-B
B AIDS
C Cough and cold
D Malaria

Question 31

Embryo sac isA megaspore
B microgametophyte
C female gametophyte
D megasporangium
Question 32

The type of immunoglobulin present in the foetus areA IgD
B IgE
C IgG
D IgM

Question 33

For better survival of human Indian population, which is the most important step?A Afforestation
B Reduction in population density
C conservation of wild life including tribals
D Both (a) and (c)
Question 34

Lcukaemia is caused byA Ca 40
B Sr 90
C caesium
D iodine

Question 35

Rice wine isA beer
B wine
C cider
D sake