AIPMT 2011 Solved Papers
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Biology 2011
Q. 94. When two unrelated individuals or lines are corssed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called
- Metamorphosis
- Heterosis
- Transformation
- Spheing
Sol:
Heterosis is equivalent to hybrid vigour.
Answer: (2)
Q. 95. A certain patient is suspected to be suffering from Acquired Immuno Deficiency Syndrome. Which diagnostic technique will you recommend for its detection?
- WIDAL
- ELISA
- MRI
- Ultra sound
Sol:
ELISA is a diagnostic test for AIDS.
Answer: (2)
Q. 96. At which stage of HIV infection does one usually show symptoms of AIDS?
- Within 15 days of sexual contact with an infected person
- When the infecting retrovirus enters host cells
- When viral DNA is produced by reverse transcriptase
- When HIV replicates rapidly in helper T-lymphocytes and damages large number of these
Sol:
Symptoms of AIDs appear when there is depletion of helper T-cells.
Answer: (4)
Q. 97. Given below is a sample of a portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it?
5' ______ GAATTC ________ 3'
3' ________CTTAAG ________ 5'
- Palindromic sequence of base pairs
- Replication completed
- Deletion mutation
- Start codon at the 5' end
Sol:
5' ______ GAATTC ________ 3'
3' ________CTTAAG ________ 5'
is the palindromic sequence, recognised by EcoRI.
Answer: (1)
Q. 98. The most common substrate used in distilleries for the production of ethanol is
- Molasses
- Corn meal
- Soya meal
- Ground gram
Sol:
Molasses are used commonly in distilleries for ethanol production
Answer: (1)
Q. 99. An organism used as biofertilizer for raising soyabean crop is
- Nostoc
- Azotobacter
- Azospirillum
- Rhizobium
Sol:
Soyabean is a legume associated symbiotically with Rhizobium.
Answer: (4)
Q. 100. There is a restriction endonuclease called EcoRI. What does "co" part in it stand for?
- coli
- colon
- coelom
- coenzyme
Sol:
In EcoRI, 'co' stands for coli (species of bacteria, from where it is obtained)
Answer: (3)