All India Institute of Medical Sciences 2008 - Question Paper

a. TATA
b. TTAA
c. AATT
d. CACC
Sol. The DNA binding sequence for RNA polymerase is called TATA box. accurate choice: (1)
Q. 82. 2 genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the F2 segregation will show:
a. Higher number of the parental kinds.
b. Higher number of the recombinant kinds.
c. Segregation in the expected 9: 3: 3: one ratio.
d. Segregation in 3:1 ratio.
Sol. When the linked genes are situated quite close, the chances of crossing over are highly decreased. Due to this, large number of parental gametes are formed and only few recombinant gametes are formed. This outcomes in higher number of parental kinds in F2 generation as compared to recombinants.
accurate choice: (1)
Q. 83. In maize, hybrid vigour is exploited by:
a. Inducing mutations.
b. Bombarding the seeds with DNA.
c. Crossing of 2 inbred parental lines.
d. Harvesting seeds from the most productive plants.
Sol. accurate choice: (3)
Q. 84. Differentiation of organs and tissues in a developing organism, is associated with:
a. Deletion of genes
b. Developmental mutations
c. Differential expression of genes
d. Lethal mutations
Sol. accurate choice: (3)
Q. 85. In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?
a. 3 : one
b. 50 : 50
c. 9 : one
d. 1 : three
Sol. This is a monohybrid test cross. accurate choice: (2)
Q. 86. The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?
a. Through elimination of repetitive DNA.
b. Deletion of non-essential genes.
c. Super-coiling in nucleosomes.
d. DNAse digestion.
Sol. The nucleosome model explains the packaging of histone proteins and DNA in the chromatin material which forms the chromosome. accurate choice: (3)
Q. 87. In cloning of cattle a fertilized egg is taken out of the mother’s womb and:
a. from this upto 8 identical twins can be produced
b. the egg is divided into four pairs of cells which are implanted into the womb of others cows
c. in the 8 cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb other cows.
d. in the 8 cell stage the individual cells are separated under electrical field for further development in culture media.
Sol. As per the experiment performed by the scientist from Japan. accurate choice: (3)
Q. 88. Which 1 of the subsequent statements is correct?
a. At current it is not possible to grow maize without chemical fertilizers.
b. Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies.
c. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
d. Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil.
Sol. The Agricultural run off contains high concentration of chemical fertilizers. Which is discharge in near by lakes causes nutrient enrichment of lakes called eutrophication. accurate choice: (2)
Q. 89. The population of an insect species indicates an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?
a. The population of its predators increases enormously.
b. S-shaped or sigmoid growth of this insect.
c. The food plants mature and die at the end of the rainy season.
d. Its population growth curve is of J-type.
Sol. A population which grows exponentially and crashes suddenly exhibits J-type growth curve. accurate choice: (4)
Q. 90. The 2 polynucleotide chains in DNA are:
a. semiconservative
b. parallel
c. discontinuous
d. antiparallel
Sol. The 2 chains in a dsDNA run in opposite direction 1 while other in opposite direction.

accurate choice: (4)
Q. 91. A plant requires magnesium for:
a. Cell wall development
b. Holdin g cells together
c. Protein synthesis
d. Chlorophyll synthesis
Q. 92. Probiotics are:
a. Live microbial food supplement
b. Safe antibiotics
c. Cancer inducing microbes
d. New type of food allergens
Sol. Live microbial food supplements are called probiotics (e.g., curd). accurate choice: (1)
Q. 93. Bowman’s glands are located in the:
a. olfactory epithelium of our nose
b. proximal end of uriniferous tubules
c. anterior pituitary
d. female reproductive system of cockroach
Sol. accurate choice: (1)
Q. 94. Increased asthamatic attacks in certain seasons are related to:
a. Low temperature
b. Hot and humid environment
c. Eating fruits preserved in tin containers
d. Inhalation of seasonal pollen
Sol. accurate choice: (4)
Q. 95. A human male produces sperms with genotypes AB, Ab, aB and ab pertaining to 2 diallelic characters in equal proportions. What is the corresponding genotype of this person?
a. AABB
b. AaBb
c. AaBB
d. AABb
Sol. The formula for gamete formation is 2n where n stands for number of heterozygous pairs. AaBb has two heterozygous pairs so it will form four kinds of gametes. accurate choice: (2)
Q. 96. Which 1 of the subsequent pairs is wrongly matched?
a. Coliforms b. Methanogens c. Yeast d. Streptomycetes - Vinegar-Gobar gas–Ethanol–Antibiotic
Sol. Coliforms are bacteria obtained in colon e.g. E. coli. For the preparation of vinegar Acetobacter aceti is employed. accurate choice: (1)
Q. 97. Which 1 of the subsequent pairs is mismatched?
a. Bombyx mori b. Pila globosa c. Apis indica d. Kenia lacca -silk-pearl–honey–lac
Sol. Pinctada vulgaris is a bivalve from which pearl is found. accurate choice: (2)
Q. 98. Which 1 of the subsequent is viral disease of poultry?
a. Pasteurellosis
b. Salmonellosis
c. Coryza
d. New Castle disease
Sol. accurate choice: (4)
Q. 99. Ultrasound of how much frequency is beamed into human body for sonography?
a. 45 - 70 MHz
b. 30 - 45 MHz
c. 15 - 30 MHz
d. 1 - 15 MHz
Sol. accurate choice: (4)
Q. 100. Lysozyme that is current in perspiration, saliva and tears, destroys:
a. most virus-infected cells
b. certain fungi
c. certain kinds of bacteria
d. all viruses
Sol. accurate choice: (3)

Earning:   Approval pending.