A sarcomere (Greek sarx flesh, meros part) is the basic unit of striated muscle tissue. Skeletal muscles are composed of tubular muscle cells (myocytes called muscle fibers) which are formed in a process known as myogenesis.Muscle fibers are composed of tubular myofibrils.Myofibrils are composed of repeating sections of sarcomeres, which appear under the microscope as dark and light bands. Sarcomeres are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.uscle fibers are composed of tubular myofibrils. Myofibrils are composed of repeating sections of sarcomeres, which appear under the microscope as dark and light bands. Sarcomeres are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.
Binary fission. Binary fission (division in half) is a kind of asexual reproduction. It is the most common form of reproduction in prokaryotes and occurs in some single-celled eukaryotes like Amoeba and Paramecium. In binary fission , the fully grown parent cell splits into two halves , producing two new cells. After replicating its genetic material, the cell divides into two nearly equal sized daughter cells. The genetic material is also equally split.
The process of reproduction in a bacterial cell occurs through binary fission. In eukaryotic cells, asexual reproduction occurs through the more complex process of mitosis. The process of binary fission in bacteria involves: 1  Replication of the circular DNA molecule inside the cell.2  Replicated DNA move to either poles of the cell. 3  The cell lengthens.his process is rapid and typically takes around 20 minutes at room temperature, meaning a single cell can produce millions of descendants in the space of a few hours. Note that not all bacterial cells undergo binary fission in 20 minutes; it can sometimes take as long as 24 hours.