The nucleus is the control center of the cell. A cell's nucleus is able to control the other activities in a cell by expressing certain segments of its DNA, which creates proteins that perform specific activities. ... The cell's DNA is packaged within the nucleus in a structural form called chromatin.
When a cell is in a hypertonic solution, water is leaving the cell and the cell starts to shrivel up. It gets smaller than its average size.
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1. IgA refers to the class of antibody, which is witnessed in very large concentrations in mucus secretions.
2. IgD refers to the class of antibody, which is not discharged by B cells, however, is expressed in the naive B cells' surface.
3. IgE refers to the class of antibody, which takes part in the defense against the infections caused by parasites, and also takes part in allergic reactions.
4. IgG refers to the class of antibody that can pass through the placenta.
5. IgM refers to the class of antibody that is the first to appear post-stimulation of B cells.