All India Institute of Medical Sciences 2008 - Question Paper

Q. 72. 1 of endangered species of Indian medicinal plants is that of:
a. Nepenthes
b. Podophyllum
c. Ocimum
d. Garlic
Sol. Podophyllum hexandrum - : (Papri), provide a drug from its rhizome; besides being stimulant and purgative and has destructive action on cancerous tissues. accurate choice: (2)
Q. 73. A genetically engineered micro-organism used successfully in bioremediation of oil spills is a species of:
a. Bacillus
b. Pseudomonas
c. Trichoderma
d. Xanthomonas
Sol. Pseudomonas putida (superbug) developed by genetic engineering by Anand Mohan Chakravorty is used to control oil spills. accurate choice: (2)
Q. 74. A sequential expression of a set of human genes occurs when a steroid molecule binds to the:
a. Ribosome
b. Transfer RNA
c. Messenger RNA
d. DNA sequence
Sol. accurate choice: (4)

Q. 76. In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are:
a. n = 21 and x = seven
b. n = seven and x = 21
c. n = 21 and x = 21
d. n = 21 and x = 14
Sol. The basic number (x) of wheat is 7. Thus the 6x = 2n = 42 and n = 21. accurate choice: (1)
Q. 77. Molecular basis of organ differentiation depends on the modulation in transcription by:
a. Anticodon
b. RNA polymerase
c. Ribosome
d. Transcription factor
Sol. accurate choice: (4)
Q. 78. Telomere repetitive DNA sequence control the function of eukaryote chromosomes because they:
a. prevent chromosome loss
b. act as replicons
c. are RNA transcription initiator
d. help chromosome pairing
Sol. Telomerase seal the ends of the chromosomes. accurate choice: (1)
Q. 79. Inheritance of skin colour in humans is an example of:
a. codominance
b. chromosomal aberration
c. point mutation
d. polygenic inheritance
Sol. Inheritance of skin colour in human is controlled by 3 genes, A, B and C. accurate choice: (4)
Q. 80. A common test to obtain the genotype of a hybrid is by:
a. crossing of 1 F1progeny with male parent
b. crossing of 1 F2 progeny with male parent
c. crossing of 1 F2 progeny with female parent
d. studying the sexual behaviour of F1 progenies.
Sol. To obtain the genotype of hybrid, it is test crossed. accurate choice: (1)
Q. 81. During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle - like structure. What is it’s DNA-binding sequence?

Earning:   Approval pending.