Zoology MCQs for NEET — Practice Questions with Answers

While not explicitly stated in the provided excerpt about the modification of Ti plasmid, the text does mention that Agrobacterium delivers T-DNA to induce tumors. A 'better understanding... has generated knowledge to transform these tools of pathogens into useful vectors for delivering genes of interest to humans,' implying that the tumor-inducing capacity would be disarmed for safe use as a vector.

The NCERT text notes: 'Selection of recombinants due to inactivation of antibiotics is a cumbersome procedure because it requires simultaneous plating on two plates having different antibiotics.'

The NCERT text states: 'In a method known as micro-injection, recombinant DNA is directly injected into the nucleus of an animal cell.'

The NCERT text describes this: 'In another method, suitable for plants, cells are bombarded with high velocity micro-particles of gold or tungsten coated with DNA in a method known as biolistics or gene gun.'

The NCERT text states: 'You know that plasmids and bacteriophages have the ability to replicate within bacterial cells independent of the control of chromosomal DNA.'

The NCERT text says: 'In almost all recombinant technologies, the ultimate aim is to produce a desirable protein. Hence, there is a need for the recombinant DNA to be expressed. The foreign gene gets expressed under appropriate conditions.'

According to the NCERT text, 'Ctenophores... are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.' Therefore, bilateral symmetry is not a characteristic of Ctenophores.

The NCERT states, 'The body bears eight external rows of ciliated comb plates, which help in locomotion.'

The NCERT text explicitly mentions, 'Bioluminescence (the property of a living organism to emit light) is well-marked in ctenophores.'

The NCERT states, 'Sexes are not separate.' This indicates that Ctenophores are typically monoecious or hermaphroditic.