Recombinant DNA can be transferred into host cell by
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Solution
Treating cells with ampicillin does not make them more permeable to DNA. Coating DNA with lipids (not carbohydrates) is used to introduce recombinant DNA molecules into host cells, injecting DNA (not protein) isa method used to place recombinant DNA into best cells.
Mitochondria supply most of the necessary biological energy by
Four chromatids and two centromeres which are homologous occurs in
Sharbati sonora variety of wheat was obtained by
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Solution
Sharbati Sonora is mutant yielding variety of wheat developed by irradiation with gamma ray from Sonora 64.
The treatment of snake-bite by antivenine is an example of
Carbon dioxide labelled with 14C has been used to identify the intermediate compounds in the Calvin cycle, the light in-dependent stage in photosynthesis. Which compound would be the first to contain the 14C?
Which one of the following phenomena supports Darwin’s concept of natural selection in organic evolution?
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Solution
When DDT was sprayed to kill mosquitoes, there were only few mosquitoes which were already resistant to DDT, and hence survived. Most of the mosquitoes which were sensitive to DDT died.
Due to differential reproduction the resistant mosquitoes got more chances of reproduction and multiplied. After few generations most of the mosquitoes were resistant.The sensitive were very few. This supports Darwin’s theory of natural selection and survival of the fittest.
Which one of the following is not true about lichens?
Kidney crystals are solid clusters of
Photosynthesis is
In blood group typing in human, if an allele contributed by one parent is IA and an allele contributed by the other parent is i, the resulting blood group of the offspring will be
In a coal fired power plant electrostatic precipitators are installed to control emission of
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Solution
In recent years,the increases in toxic substances of NOx and/or SPM (Suspended Particulate Matter)from vehicles come to be serious problem. About the correlation between the traffic volume in our model and the real volume, we obtained the correlation coefficient of 0.74.Simultaneously,we got the result that the concentration of NOx was approximately 70 to 230 ppm.That of SPM was approximately 40 to 100 µg/m3.
The concepts of conservation biology come mainly from all of the following fields except
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Solution
Although immunology is sometimes a useful tool in assessing the amount of genetic variation that exists in a population, its importance is less than the other fields listed.
Chemiosmotic theory of ATP synthesis is based on –
Biodiversity of a geographical region represents
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Solution
Biodiversity is the number of variety of organism found within a specified geographic region.
The number of chromatids in a chromosome at anaphase is
Haemophilia is mentioned as a trait carried by the mother and passed to her sons. What is the pattern of inheritance for this trait ?
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Solution
Haemophilia is an X-linked trait, and can only be inherited by the son from his mother’s X chromosome. The father contributes the Y chromosome to his son (not his X chromosome) and thus cannot pass any of his X-linked alleles to his son.
During the G1 phase of cell division
A plant differs from an animal mainly in :
