Direct gene transfer is the transfer of naked DNA into plant cells, but the presence of a rigid plant cell wall acts as a barrier to uptake. Thus, protoplasts are the favored target for direct gene transfer. Polyethylene glycol-mediated DNA uptake is a direct gene transfer method that uses the interaction between PEG, naked DNA, salts and the protoplast membrane to affect the transportation of DNA into the cytoplasm.
List-I | List II | ||
---|---|---|---|
A. | Phenol-formaldehyde resin | I | Glyptal |
B. | The copolymer of 1,3-butadiene and styrene | II | Novolac |
C. | Polyester of glycol and phthalic acid | III | Buna-S |
D. | Polyester of glycol and terephthalic acid | IV | Dacron |
List I | List II | ||
A | Pons | I | Provides additional space for Neurons, regulates posture and balance. |
B | Hypothalamus | II | Controls respiration and gastric secretions. |
C | Medulla | III | Connects different regions of the brain. |
D | Cerebellum | IV | Neurosecretory cells |
In the given figure, which component has thin outer walls and highly thickened inner walls?
Neoprene is formed from chloroprene. It is prepared by free radical polymerisation. The monomer of neoprene is chloroprene. It is used for preparing gaskets, conveyor belts etc.