2. Draw a neat and well-labelled diagram of a generalized cell. Also, explain the
components in the nucleus of a cell.
Answers
Answer:
It was discovered by Robert Brown (1831).
2. It is the major part of a eukaryotic cell that contains the genetic material. Prokaryotic cells have no nucleus as such.
3. Each nucleus remains enclosed in a nuclear membrane or nuclear envelope. It is a double membrane surrounding the nucleus (Fig. 299). Each layer has a typical plasma-membrane like structure and is 4 nm to 6 nm in width.
Ultrastructure of a Nucleus
Electron micrographs reveal the connection between the outer nuclear membrane and the endoplasmic reticulum. A perinuclear space is present in between the membranes. At various points the two membranes fuse and form pores.
4. The interphase nucleus of eukaryotic cells contains a network of chromatin fibres, which become organised into chromosomes before cell division.
5. The substance of the nucleus apart from the chromatin is called nucleoplasm or karyoplasm. It
Explanation:
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