Polyethylene glycol method is used for
- biodiesel production
- seedless fruit production
- energy production from sewage
- gene transfer without a vector.
The Correct Option is D
Solution and Explanation
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.
- Plant cells have rigid cell walls that inhibit the process of gene transfer.
- There are various techniques to transform plant cells when they are in the protoplast stage.
- Before the protoplast regenerates the cell wall, direct gene transfer is carried out.
- PEG method is an efficient method of transforming plant cells by direct gene transfer.
- PEG transfer stimulates uptake of liposomes and improves the efficiency of electroporation.
- PEG transformation is preferred over electroporation in monocot protoplasts as it has comparatively higher survival rates post-treatment.
Top Questions on polymers of commercial importance
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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 Choose the correct answer from the option given below:- JEE Main - 2022
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Statement I : In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.
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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
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(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
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The output (Y) of the given logic gate is similar to the output of an/a :
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Concepts Used:
Polymers of Commercial Importance
- Polypropene is formed by the repetitive joining of propene. Propene is the monomer of Polypropene. It is used in the preparation of different materials like fibres, ropes, pipes etc.
- Polystyrene is formed from aromatic hydrocarbons, styrene is its monomer. It is used as a wrapping material to provide coverage to important materials, cabinets of television, in making radios.
- Polyvinyl Chloride (PVC) is formed by combining a large number of molecules of vinyl chloride. Vinyl chloride is its monomer. It is used in making raincoats and especially in water pipes.
- Glyptal is a synthetic polymer that is formed by monomers of Ethylene glycol and Phthalic acid. It is used in the manufacturing of paints, fabrics, lacquers etc.
- Bakelite is known as Polyoxybenzylmethylenglycolanhydride. Phenol and Formaldehyde are used as monomers to produce bakelite which is formed by the condensation reaction of these monomers.
- Natural Rubber is composed of polyisoprene molecules linked together to form an elastomeric structure. Natural rubber is used for various purposes like making tyres, rubber bands, lid grippers etc.
- Polypropylene is a hydrocarbon polymer that has a linear structure. It is a multifaceted polymer as it has properties of plastic as well as fibre and hence is used for multi-purposes. Propylene is the monomer of polypropylene.
- Polyethylene Terephthalate also termed PET is a thermoplastic polymer. Ethylene glycol and terephthalic acid are used in the preparation of Polyethylene Terephthalate and in making different things like containers for packing food and drinks.
- Polytetrafluoroethylene also termed PTFE is a fluoropolymer. It is slippery in nature and is highly resistant to heat. The monomer of polytetrafluoroethylene is tetrafluoroethylene.
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.