STRUKTUR DAN FUNGSI SEL MIKROBA

Pokok Bahasan Mata Kuliah Mikrobiologi Dasar Program Studi Biologi (S1) Fak. Biologi UNSOED

The Nucleus and Cell Division
Nuclei are membrane-bound structures that house most of the genetic material of the cell
Nuclear Structure
1 Chromatin is the dense fibrous material seen within the nucleoplasm of the nucleus; this is the DNA containing part of the nucleus; when the cell is dividing, chromatin condenses into visible chromosomes
2 The nuclear envelope is a double-membrane structure penetrated by nuclear pores that allow materials to be transported into or out of the nucleus
3 The nuclear lamina, a network of intermediate filaments, lies against the inner surface of the nuclear envelope and supports it
4 Nuclear pores penetrate the nuclear envelope and allow materials to be transported into or out of the nucleus
The nucleolus is a involved in the synthesis of ribosomes
Mitosis is a process of nuclear division in which the (duplicated) genetic material is distributed equally to two daughter nuclei so that each has a full set of chromosomes and genes
Meiosis is a complex, two-stage process of nuclear division in which the number of chromosomes in the resulting daughter cells is reduced from the normal (diploid) number to one-half of that number (haploid)
Cytokinesis is the process by which the cytoplasm and its components are distributed to the new daughter cells; it usually occurs following mitosis and meiosis

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