Protoplasts lack a cell wall and are highly susceptible to osmotic stress. To prevent them from bursting or collapsing, osmotic stabilizers are added to the isolation medium. Mannitol and sorbitol are sugar alcohols commonly used for this purpose because they are non-metabolizable and effectively maintain the osmotic balance of the surrounding environment, keeping the protoplasts stable.

Polyethylene glycol (PEG) is a widely used chemical fusogen in plant tissue culture and genetic engineering. It acts by dehydrating the plasma membrane, which reduces the repulsion between protoplasts and promotes membrane fusion. This technique is essential for somatic hybridization, allowing scientists to combine the genomes of two different plant species to create novel hybrids with desirable traits.

T-DNA (Transfer DNA) is the specific segment of the Ti plasmid found in Agrobacterium tumefaciens that is transferred into the host plant cell genome. This DNA contains the genes for auxin and cytokinin biosynthesis, which drive tumor growth (oncogenesis), as well as genes for opine synthesis. Once integrated, these genes allow the plant cells to grow independently of exogenous hormones, forming crown gall tumors.

Somatic Cell Nuclear Transfer (SCNT) is a laboratory technique used to create a cloned embryo by transferring the nucleus of a somatic cell into an enucleated egg cell. This process was famously used to create Dolly the sheep, marking a significant milestone in reproductive cloning technology for animals.

Plant tissue culture is a collection of techniques used to maintain or grow plant cells, tissues, or organs under sterile conditions on a nutrient culture medium. It allows for the rapid clonal propagation of plants, ensuring that the offspring are genetically identical to the parent plant, which is useful for commercial agriculture and conservation.

Embryo culture is a technique used to grow embryos that might otherwise fail to develop. E. Hannig is historically recognized for his pioneering work in 1904, where he successfully isolated and cultured embryos of Raphanus and Cochlearia on mineral salt and sugar media, marking the first successful in vitro culture of angiosperm embryos.

In early plant tissue culture research, Power et al. demonstrated that sodium nitrate (NaNO3) could act as an effective fusogen to induce the fusion of protoplasts from different plant species. This technique was a significant milestone in plant biotechnology, allowing for the creation of somatic hybrids through the fusion of isolated plant cells.

Monoclonal antibodies are produced by a single clone of cells (a single parent cell line). Because they originate from a single B-cell clone, they are identical and bind to a single, specific epitope on an antigen.

The process begins with isolating DNA, fragmenting it, selecting the desired fragment, amplifying it, ligating it into a vector, transforming the host, expressing the gene product, and finally performing downstream processing to purify the protein.

Restriction enzymes, or restriction endonucleases, are enzymes that recognize specific short sequences of DNA and cleave the phosphodiester backbone at those sites. They are essential tools in genetic engineering for isolating specific genes, creating recombinant DNA, and mapping genomes, as they provide a precise way to cut DNA molecules into manageable fragments.