21. The superiority of the hybrids over either of the two parents in one or more traits is called
22. Raphanobrassica has been artificially produced from Raphanus sativus and Brassica oleracea by
23. The main factor of evolution is
24. The absence of Y-chromosome in human beings causes
25. The greatest weakness of Darwinism is that it did not explain
26. Who among the following were awarded Nobel Prize for artificial synthesis of the nucleic acids?
27. The origin of universe occurred about
28. Consider the following statements regarding the advantages of biofertilizers and choose the correct answer:
1. Biofertilizers enhance crop yield even under ill irrigated conditions
2. Biofertilizers do not cause atmospheric pollution
3. Biofertilizers are cheap and economical
4. Biofertilizers improve physical and chemical properties of soil
1. Biofertilizers enhance crop yield even under ill irrigated conditions
2. Biofertilizers do not cause atmospheric pollution
3. Biofertilizers are cheap and economical
4. Biofertilizers improve physical and chemical properties of soil
29. Ribose, the pentose sugar of RNA, has an identical structure to DNA except that there is
30. Consider the following statements and choose the correct answer:
1. The structural genes direct the synthesis of cellular proteins through messenger RNA (mRNA)
2. The promoter gene determines whether or not the structural genes are to be repressed by the repressor
3. The regulator gene directs the synthesis of a protein which may be an active repressor or an inactive repressor
1. The structural genes direct the synthesis of cellular proteins through messenger RNA (mRNA)
2. The promoter gene determines whether or not the structural genes are to be repressed by the repressor
3. The regulator gene directs the synthesis of a protein which may be an active repressor or an inactive repressor
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