Genetics
o The branch of biology that studies heredity and
variation, especially the mechanisms of hereditary
transmission of characteristics from parent to
offspring.o positive charged
o H1, H2A, H2B, H3, H4
Diverse group of proteins involved in various cellular
processes, including gene regulation.The shape is ultimately determined by the specific function of the cell as
follows:
o Red blood cells (discoidal)
o Nerve cells )stellate(
o guard cells (Lenticular(
4-Structure
A eukaryotic cell consists of the following components :
A. Cell wall and plasma membrane
B. Cytoplasm
C. Nucleus
Nucleus
o The nucleus is centrally located and spherical cellular component which controls all the vital
activities of the cytoplasm and carries the hereditary material the DNA in it.
o The nucleus consists of the following three structures :
1-Nuclear envelope and nucleoplasm:
Nuclear envelope comprises two nuclear membranes (an inner nuclear membrane and an outer nuclear membrane).