21.
Recent Studies on Archae suggest that life could have originated
1. extra
terrestrially and seeded through meteorite impacts.
2. in shallow
coastal areas.
3. in deep
hydrothermal vents.
4. in hot,
terrestrial habitats.
22.
If the ratio of the number of nonsynonymous to synonymous substitutions per
site in protein coding gene is greater than one, it is an evidence of selection
that is
1. positive
2. negative
3. neutral
4. random
23.
The following is the biochemical pathway for purple pigment production in
flowers of sweet pea: Recessive mutation of either gene A or B leads to the
formation of white flowers. A cross is made between two parents with the genotype:
AaBb x aabb. Considering that the two genes are not linked,
the phenotypes of the expected progenies are
1. 9 purple: 7 white.
2. 3 white : 1 purple.
3. 1 purple: 1 white.
4. 9 purple: 6 light purple: 1
white.
24.
The frequencies of alleles 'A' and 'a' in a population at Hardy-Weinburg
equilibrium are 0.7 and 0.3, respectively. In a random sample of 250
individuals taken from the population, how many are
expected
to be heterozygous?
1. 112
2. 81
3. 105
4.145
25.
The transition to flowering in plants requires
1. growth of plants under long-
day conditions.
2. growth of plant under short-
day conditions.
3. reprogramming of
the shoot apical meristem
4. synthesis of the flowering
hormone florigen.
26.
In an altruistic act. if a donor sacrifices ‘C’offspring which sthe recipient
to gain 'B' offspring and the donor is related to the recipient by a
coefficient γ. Under which condition would kin
selection
favor this altruistic trait?
l. B > C
2. B > γC
3. γB - C = 0
4. γB - C > 0
27.
Aneuploid females with only one X chromosome is a characteristic of individuals
with
1. Cri du chat syndrome
2. Klinefelter syndrome
3. Down syndrome
4. Turner syndrome
28.
Which of the following food crops has recently been genetically engineered to o
in edible vaccine to develop immunity against hepatitis B?
1. Banana
2. Maize
3. Potato
4. Tomato
29.
The most commonly used method of estimating primary productivity of a pond
involves measurement of the amount of
1. CO2 utilized.
2. autotroph
biomass.
3. Oxygen released.
4. Organic carbon
30.
The area of allowed regions in the Ramachandran map will be least for
1. Gly.
2. L-Ala.
3. L-Prol.
4. a-methyl
L-valine.
31.
Small RNAs with internally complementary sequences that form hairpin-like
structure, synthesized as precursor RNAs and cleaved by endonucleases to form
short duplexes are called
1. snRNA.
2. mRNA.
3. tRNA.
4. miRNA.
32.
A much greater proportion of energy fixed by autotrophs is transferred to the
herbivore level III the open ocean ecosystem than in a forest ecosystem because
1. aquatic
autotrophs are small.
2. aquatic
herbivores are more efficient feeders.
3. terrestrial
autotrophs are less efficient feeders.
4. terrestrial
autotrophs have more indigestible tissues.
33.
Polar bears maintain their body temperature because they have more of
1. transducin
protein.
2. uncoupling
protein.
3. myoglobin
protein.
4. FoF1 ATPase.
34.
Transport of water across aquaporins is regulated by the presence of which of
the following sequence of three highly conserved amino acids?
1. Ala-Asn-Pro.
2. Pro-Asn-Ala.
3. Asn-Pro-Ala.
4. Pro-Ala-Asn.
35.
Which of the cyclins have/has essential functions in S-phase of cell cycle?
1. A-type.
2. B-type.
3. D-type.
4. Both B and
D-types.
36.
During generation of an action potential, depolarization is due to
1. K+ efflux.
2. Na+ efflux.
3. Na+ influx.
4. K+ influx.
37.
G protein-linked receptors are transmembrane proteins of
1. single-pass.
2. three-pass.
3. five-pass.
4. seven-pass.
38.
Release of nutrients, oxidants or electron donors into the environment to
stimulate naturally occurring microorganisms to degrade a contaminant, is
referred to as
1. biostimulation.
2.
phytoremediation.
3. bioaugmentation.
4. bioremediation.
39.
A mechanism that can cause a gene to move from one linkage group to another is
1. crossing over.
2. inversion.
3. translocation.
4. duplication.
40.
Th2 response is generated and maintained mainly by which of the following pair
of cytokines?
1. IL-4 and IL-10.
2. IL-12 and IFN-γ.
3. IFN-γ and TNF-a.
4. IL-2 and IL-I2.
41.
Cytoplasmic detern1inants coding for anterior structure of Drosophila embryo,
if injected elsewhere in the recipient embryo, would lead to
1. normal
development
2. Formation of
additional ectopic head.
3. degeneration
4. a phenotype with
two heads and two tails
42.
The dwarf pea mutant (le) used by Mendel was defective in which of the
following enzyme involved gibberellin biosynthesis?
1. ent-Kaurene
synthase.
2. GA 3β-hydroxylase.
3. GA 20-oxidase.
4. ent-Kaurenoic
acid hydroxylase.
43.
ELISA assay uses
1. an enzyme which
can react with secondary antibody.
2. an enzyme which
can react with the antigen.
3. a substrate which
gets converted into a colored product.
4. a radiolabelled
secondary antibody.
44.
Which of the following molecules is involved in Ca2+-dependent
cell-cell adhesion?
1. Calmodulin
2. Cadherin
3. N-CAM
4. Calpain
45.
The 5' Cap of RNA is required for the
1. stability of RNA
only.
2. stability and
transport of RNA.
3. transport of RNA
only.
4. methylation of
RNA.
46.
Yeast artificial chromosome (YAC) vectors contain selectable markers. Loss of
which marker at the cloning site distinguishes the religated YACs from the
original vector marker?
1. TRP1
2. SUP4
3 URa3
4.CEN
47.
In amphibian oocyte, the germplasm which gets segregated during cleavage to
give rise to primordial germ cells (PGC's) is normally
1. distributed
evenly throughout the oocyte.
2. localized at
animal pole.
3. localized at
vegetal pole.
4. aggregated in
central part of oocyte.
48.
Which of the following statements with respect to alternate oxidase activity in
cyanide- resistant respiration in plants, is not correct?
1. Alternate oxidase
accepts electrons directly from cytochrome C
2. Some plants
exhibit thermogenesis during inflorescene development.
3. Transcription of
alternate oxidase gene is often induced by various abiotic stresses
4. When electrons
pass to alternate oxidase, two sites of proton pumping are bypassed.
49.
In mature Arabidopsis embryo, root apical meristem consists of cells
derived from
1. embryo and apical
suspensor cell.
2. embryo only.
3. suspensor only.
4. hypophysis only
50.
Na+-K+
ATPase is a tetramer of 2α and 2β subunits. On which of the following subunits are
the Na+ and K+
binding sites present?
1. both on α
2. both on β
3. Na+ on α and K+ on
β
4. Na+ on β and K+ on
α
51.
A mother of blood group O has a group O child. The father could be of blood
type
1. A or B or O.
2. O only.
3. A or B.
4. AB only.
52.
Following figure shows McArthur and Wilson's equilibrium model of biota on a
single island. In this figure, terms A, B, C and D in order are
1. extinction,
immigration, equilibrium number of species, size of species pool.
2. immigration,
extinction, equilibrium number of species, size of species pool.
3. extinction,
immigration, size of species pool, equilibrium number of species.
4. immigration,
extinction, size of species pool, equilibrium number of species.
53.
Routinely used glucose biosensor estimates blood glucose level by sensing the
concentration of
1. glucose.
2. oxygen.
3. δ-gluconolactone.
4. H2O2
54.
Name the ectothermic animal that can thermoregulate by behavioural means rather
than by physiological means.
1. Bumble bee in an
orchard.
2. Tuna fish in the
Ocean.
3. Lizard in a
desert.
4. Flatworm in a
pond.
55.
Which of the following methods of plant transformation can be used to introduce
a gene into chloroplast genome?
1.
Agrobacterium-mediated transformation
2. Particle delivery
system
3. Permeabilization
4. Electroporation
56.
The μ and σ of wing length (a normally distributed parameter) in a
population of fruit flies are 4 and 0.2 mm, respectively. In a random sample of
400 fruit flies, how many individuals are expected to have wing lengths greater
than 4.4 mm?
1. 20
2. 64
3. 10
4. 336
57.
Which of the following is a characteristic of an early seral community?
1. Narrow niche
specialization.
2. High species
diversity .
3. Low community
production.
4. Open mineral
cycling.
58.
A culture of an E. coli strain that is lysogenic for phage lambda is grown
at 32°C. Induction of the prophage from the host chromosome will occur when the
culture is exposed to
1. 40°C.
2. ultra violet
radiation.
3. infra red
radiation.
4. wild type E.
coli culture
59.
During urine formation, the filtration of blood at the glomerulus is
1. an active
process.
2. an osmotic
process.
3. a
pressure-dependent physical process.
4. a non energy -
mediated transport process.
60.
If the core body temperature of a human rises above normal, which of the
following processes would be initiated sequentially for Thermo-regulation?
1. Peripheral
vasodilatation, increased rate of respiration, tachycardia.
2. Peripheral
Vasoconstriction, increased rate of respiration, bradycardia.
3. Peripheral
vasodilatation, decreased rate of respiration, tachycardia.
4. Peripheral
vasodilatation, decreased rate of respiration, bradycardia.
61
With which protein of Yersinia would integrin proteins of mammalian
cells interact for internalization?
1. Pilin
2. Fimbrin
3. Invasin
4. Adherin
62.Graves
disease is associated with
1. insufficiency of
thyroid hormones.
2. excess of thyroid
hormones.
3. insufficiency of
corticosteroids.
4. excess of growth
hormones.
63.
The fidelity of replicative base selection can be reduced by a factor of 102
when the repair of DNA synthesis involves
1. AP endonuclease.
2. ABC exinuclease.
3. DNA photolyase.
4.TLS DNA polymerase.
64.
What is the minimum number of NTPs required for the fom1ation of one peptide
bond during protein synthesis?
1. One
2. Two
3. Four
4. Six
65.
'Imperfect fungi' is a group represented by fungal species which have
1. simple mycelia.
2. no known
mechanisms of sexual reproduction.
3. unkown
phylogenetic relationship.
4. lost its
survival mechanism against harsh environments.
66.
The photoreceptor commonly involved in light entrainment of the biological
clock in flies, moulds and plants is
1. phytochrome.
2. rhodopsin.
3. carotenoid.
4. cryptochrome.
67.
The free energy ΔG of a dissolved solute
1. increases with
solute concentration
2. decreases with
solute concentration
3. is independent
of solute concentration
4. depends only on
temperature.
68.
Which of the following is not a characteristic of phylum Chordata?
1. Pharyngeal slits
2. Amniotic egg
3. Postanal tail
4. Notochord
69.
In India, brown antlered deer (sangai) is found only in the floating landmasses
of
1. Wular lake.
2. Sasthamkotta
lake.
3. Dallake.
4. Lok Tak lake.
70.
Both halophytes and glycophytes compartmentalize toxic ions into the
intracellular compartment or actively pump them out of the cell to the
apoplasts with the of membrane transport
proteins. Among these, the Na+
- H+ antiporter, NHX 1,
is localized in the
1. plasma membrane.
2. chloroplast
(inner envelope).
3. mitochondria
(outer membrane).
4. tonoplast.
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