Which organism is used to transfer T-DNA
Streptomyces hygroscopicus
Agrobacterium tumefaciens
Salmonella typhi
Escherichia coli
B.
Agrobacterium tumefaciens
Ti plasmid (tumour inducing) from the soil bacterium Agrobacterium tumefaciens is effectively used as vector for gene transfer to plant cells. The part of Ti plasmid transferred into plant cell DNA, is called the T-DNA. This T-DNA with desired DNA spliced into it, is inserted into the chromosome of the host plant where it produces copies of itself, by migrating from one chromosomal position to another at random.
Assertion: GM crops can affect human health by causing allergic reactions.
Reason: Transgenes in commercial crops can endanger native species e.g., the Bt toxin gene expressed in pollen might endanger pollinators like honeybees.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Somaclones are prepared by
callus culture
sexual reproduction
micropropagation
somatic hybridisation
What is true about Bt toxin
Bt protein exists as active toxin in the Bacillus.
The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication.
The concerned Bacillus has antitoxins.
The inactive protoxin gets converted into active form in the insect gut
Genetically modified (GM) crops can be produced by
recombinant DNA technology
somatic hybridization
cross breeding
micropropogation
Wine and beer are produced directly by fermentation whereas brandy and whisky require both fermentation and distillation. This is because
fermentation is inhibited at an alcohol level of 10-18%
distillation prolongs storage
distillation improves quality
distillation purifies the beverage.
Assertion: GM foods are facing widespread resistance by the people.
Reason: GM foods have mutated genes which cause infections and allergies.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The number of chromosomes present in the cells of the bread wheat, Triticum aestivum suggests that it is
hexaploid
diploid
tetraploid
pentaploid
Which of the following represents the action of insulin?
Increases blood glucose level by stimulating glucagon production
Decreases blood glucose level by forming glycogen
Increases blood glucose level by promoting cellular uptake of glucose
Increases blood glucose level by hydrolysis of glycogen
Assertion : The technique of micropropogation has been used to introduce variations in the offspring.
Reason : It is not possible to generate virus free plants by micropropogation.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false
