Download 1 bio. hints of aipmt mt – viii

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BIO. HINTS OF AIPMT M.T. – VIII
(NCERT BASED)
7. Ans. (a)
Hint:
(i) False, Translation unit doesn’t include the
UTR’s
(ii) True
(iii) False; Functions of only 50% (i.e. 15,000)
of the discovered genes is known; the
estimated number of genes is about
30,000.
(iv) False, the bulk genomic DNA forms the
major peak, and the satellite DNA forms
the other small peaks on density gradient
centrifugation.
8. Ans. (a)
Hint: Only (ii) is correct.
(i) False; Red algae have no motile stages.
(ii) True
(iii) Kelps are Brown algae
(iv) They are seen in Brown algae; Porphyra is
a thalloid marine red algae.
9. Ans. (c)
Hint:
(A) Sepia (cuttle fish; Mollusca) – muscular foot
(B) Bombyx (Silkworm) – Malpighian tubules
(C) Physalia (Portuguese man of war) Cnidaria –
Cnidoblasts
(D) Pleurobranchia – Ctenophora – Comb plates
13. Ans. (d)
Hint:
 A is polycarpellary; apocarpous of Michelia
 B is polycarpellary; syncarpous of Papaver.
14. Ans. (c)
Hint: (i), (iii); (iv) are incorrect.
17. Ans. (a)
Hint: B is the gas holder. C contains sludge.
20. Ans. (b)
Hint: Grasshopper is an example of XO type of sex
determination in which males have only one X chromosome whereas females have a pair of XChromosomes.
21. Ans. (c)
Hint: (a) Marchantia has a haploid gametophytic
main plant body
(b) Agar is obtained from Gelidium and
Gracilaria
(d) Selaginella has a diploid sporophytic
main plant body
22. Ans. (c)
Hint: End of 2nd month = Foetal limbs and digits appear
End of 3rd month = Major organ systems
develop
Limbs well developed
External genitalia
well developed
th
During 5 month = 1st movement
Hair on the head appear
End of 6th month = Eye lids separate
Eye lashes appear
23. Ans. (d)
Hint: In polysaccharide chain, right end is the
reducing end and the left end is the nonreducing end. Cellulose does not contain
complex helices and hence cannot hold I2.
25. Ans. (d)
Hint: (a) Hookworm is pseudocoelomate
(b) Octopus is mollusca and is
bilaterally symmetrical
(c) Echinoderms have calcareous
endoskeleton.
26. Ans. (c)
Hint: Failure of cytokinesis after telophase
results in polyploidy. In sickle cell anaemia,
GAG is changed to GUG.
28. Ans. (c)
Hint: Human genome contains 3164.7 million
nucleotide bases.
33. Ans. (a)
Hint: In Meselson & Stahl experiment the DNA
extracted from the culture after one
generation was of hybrid or intermediate
type only. In lac operon, the repressor is
synthesised all the time.
34. Ans. (b)
Hint: The cell envelope consists of outermost
glycocalyx, followed by the cell wall and then
the plasma membrane. Glycocalyx can be a
loose sheath called the slime layer in some,
while in others it may be thick and tough, called
the capsule.
35. Ans. (a)
Hint: A typical Nucleosome contains 200 bp of
DNA helix. DNA is negatively charged and
histone octamer is positively charged.
Asparagine is amide of aspartic acid & valine is
a neutral amino acid. Histones are rich in basic
amino acids lysine and arginine.
36. Ans. (a)
Hints: Anchylostoma (Hook worm) =
Aschelminthes or Nematoda
(Pseudocoelom)
Fasciola (Platyhelminthes) =
2
Acoelomate
Bombyx (Silk worm) = Arthropoda –
coelomate
Pila (Snail) = Mollusca- coelomate
37. Ans. (a)
Hint: Dryopithecus was more ape-like while
Ramapithecus was more man -like. The
Neanderthal man lived in near east and
central Asia between 1 lac and 40 thousand
years back.
38. Ans. (a)
Hint: Myotonic dystrophy is an autosomal
dominant trait.
40. Ans. (b)
Hint: Lysosomal enzymes are active at acidic pH.
Modified from Golgi body are released from the
trans face.
41. Ans. (c)
Hint: Calcium is about 3.6 % in Earth’s crust
and 1.5% in human body.
43. Ans. (c)
Hint: In sickle cell anaemia, there is mutation in
beta chain. RNA being unstable mutates
faster than DNA.
48. Ans. (b)
Hint: Human red cells are about 7 m in diameter.
57. Ans. (c)
Hint: Jersey is an improved breed of cattle while
Leghorn is an improved breed of chicken.
MOET stands for Multiple Ovulation Embryo
Transfer Technology.
62. Ans. (c)
Hint: Rosie was the first transgenic cow, which
produced human protein-enriched milk. ELISA
is based on the principle of antigen - antibody
interaction.
77. Ans. (b)
Hint: Yeasts poison themselves to death when
the concentration of alcohol reaches about
13 percent. The TCA cycle starts with the
condensation
of
acetyl
group
with
oxaloacetic acid under the effect of enzyme
citrate synthase.
79. Ans. (c)
Hint: Caused by viroids, which lack the protein
coat.
80. Ans. (d)
Hint: Desmids (golden algae) and diatoms
belong to Chrysophytes (Protista)
82. Ans. (b)
Hint: Mustard and Hibiscus have hypogynous
flowers.
83. Ans. (b)
Hint: Chlorophyll a is blue green in colour while
chlorophyll b is yellow green in colour. The
membrane system of chloroplast is responsible
for trapping the light energy and also for
synthesis of ATP and NADPH.
84. Ans. (b)
Hint: Solanaceae has five stamens, which are
epipetalous.
85. Ans. (c)
Hint: (a) The testis are connected to kidney
through bidders canals
(b) Hepatic and Renal portal systems
are present in frog also.
(c) They absorb water through skin and
never drink it.
(d) Frogs lack an external ear; so no
pinna and no auditory canal.
89. Ans. (d)
Hint: Starting from posterior to anterior end (Y
to X) the order is:
Male genital pores (18th segment) A
Female genital pore (14th segment) C
Spermathecal pore (5-9th segment) D
Peristomium (1st segment) B