mitochondria dna

. The inner membrane encloses a matrix, which is rich in proteins, lipids, ribosomes, RNA and one or two circular DNA molecules. The number of mitochondria in a cell varies considerably and depends on the mature of the cell. Cells with very high-energy requirements possess very ..

Nucleic acids are of two types. They are DNA and RNA. In higher cells, DNA is localised mainly in the nucleus within the chromosome. A small amount of DNA is present in the cytoplasm also it is contained in the mitochondria and chloroplas..

With the exception of a few viruses, DNA forms the genetic material in all living organisms. In the prokaryotic cells DNA occurs in the cytoplasm. In the eukaryotic cells it is confined largely to the nucleus and forms the main component of chromosomes. A small amount of DN..

With the exception of a few viruses, DNA forms the genetic material in all living organisms. In the prokaryotic cells DNA occurs in the cytoplasm. In the eukaryotic cells it is confined largely to the nucleus and forms the main component of chromosomes. A small amount of h..

Deoxyribose Nucleic Acid (DNA) - With the exception of a few viruses, DNA forms the genetic material in all living organisms. In the prokaryotic cells DNA occurs in the cytoplasm. In the eukaryotic cells it is confined largely to the nucleus and forms the main componen..

Plasma membrane: The permeability of the plasma membrane decreases due to the accumulation of calcium in the membrane. Endoplasmic reticulum: In the cytoplasm of old cells, granular ER decreases. In the nerve cells, nissl granules are decreased. Mitochondria: Mitochondria..

Mitosis - This type of cell division occurs in the somatic (body) cells. Here a diploid (2n) parent cell gives rise to two diploid (2n) daughter cells. For the purpose of description mitosis is divided into four stages - Prophase Metaphase Anaphase Telophase It is important to understand that Mitos..

Two things happen during interphase. First, the DNA doubles itself so that sufficient DNA is made available for each of the two daughter cells. A cell never divides until this new genetic material is formed. Secondly, the cell builds up a sufficiently large store of energy to ca..

The spermatids formed as a result of maturation division is a typical animal cell with all the cell organelles present in it. In this form it cannot function as a male gamete. So many changes take place to change the non-motile spermatid into motile spermatozoan. The main aim of the changes is to i..

) or secretory products (gums, alkaloids, hormones, etc) or excretory products (calcium carbonate and other salts). These substances are generally stored in the vacuoles. Cell organelles are mainly of two types membrane-bound and non-membranous. Membrane bound organelles include endoplasmic reticul..