Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because –
(a) bacteria are resistant to the toxin
(b) toxin is immature,
(c) toxin is inactive,
(d) bacteria encloses toxin in a special sac.

Bt toxin is produced by

Bt toxin is produced by a bacterium called

Consider the following statements. I) Specific Bt toxin genes have been isolated from Bacillus thuringiensis. II) Bt toxin is coded by a gene named cry. III) Bt toxin protein exists as inactive protoxins. Which of the statements given above are correct?

Consider the following statements. I) Bt toxin gene has been cloned from the bacteria. II) Genetic engineering works only on animals and has not yet been successfully used on plants. III) Strains of Bacillus thuringiensis are used in producing bioinsecticidal plants. Which of the statements given above are correct?

Fill up the blanks. I)...A... are plants, bacteria, fungi and animals whose genes have been altered by manipulation. II) ...B... forms protein crystals which contains a toxic insecticidal protein. III) By using ...C... vectors, nematode specific genes were introduced into the host plants which produced both sense and antisense RNA in the host cells. IV) RNA interference (RNAi) technique has been devised to protect the plants from nematode is silenced by ...D... produce by the host plant. Here A lo D can be identified as

Match each term on the right with the definition on the left, Column - I A) Bacterial enzymes used to cut DNA at defined sequences B) Sequences cut by restriction enzymes C) Ends left on DNA segments cut by DNA restriction enzymes D) Circular pieces of DNA found in bacteria E) Bacterial viruses F) Process by which bacteria take up pieces of DNA from the environment G) Plasmid DNA that has incorporated human DNA H) Term used to describe any vehicle that moves DNA from the organism to another Column - II I) Transformation II) Cloning vector III) Recombinant IV) Recognition sequences V) Plasmids VI) Sticky ends VII) Restriction enzymes VIII) Bacteriophages

Which of the following are correct? a) PCRs are defined as the organisms, which carry foreign genes b) SCID is a group of rare genetic disorders c) Cloning is the production of GMOs, eg, Flavr-savr tomato d) The bacteria use restriction endonucleases to destroy the DNA of invading foreign viruses

Following are the statements about the role of antibodies during immunity A)They bring precipitation of insoluble antigens and agglutination of soluble antigens B) They bring precipitation of soluble antigens and agglutination of insoluble antigens C) They also activate the phagocytes and inactivate the complement system D) They help in opsonising and immobolising the bacteria Find the correct statements

Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called 'natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical. a) Penicillin_ b) Sulfonamide_ c) Vitamin C __. d) Growth Hormone ___