Cytoplasm

Chromatin is a compacted form of chromosomal DNA, the basic unit of which is the nucleosome, consisting of 146 bp of DNA wrapped around a core histone octamer. To regulate the structure of chromatin, histones undergo a large number of post-translational modifications, such as acetylation, methylation, phosphorylation, ubiquitylation, sumoylation, ADP ribosylation, beta-N-acetylglucosamine and deamination. These modifications can also recruit other remodeling proteins and complexes to reposition…

the cell and provides energy for chemical reactions. In the same way, the furnace makes heat for the house to keep it warm. The cytoplasm is basically everything in a cell that is inside of the plasma membrane excluding the nucleus.It makes up most of the cell which the organelles float around in. The walls of the house contain everything inside of it, just like the cytoplasm contains all the organelles. The ribosomes are the part of the cell that makes the proteins. In the same way, the kitchen…

Almost every cell goes through a phase called the Cell Cycle this is where they cell grows and develops and then eventually splits into two cells. Why is this important? Well through the cell cycle it repairs damaged cells or replaces worn out cells. When you break your leg the cells work to get the bone healed or when you have a cut the cell cycle will help you by dividing cells to create a scab for your cut to heal. The cell spends most of its life in interphase, then it goes to the mitotic…

Primary central MEC has been reported in the first to seventh decade; however, cases occurring in the: fourth and fifth decades are most widespread. [6] In children, gender ratio and the mandible to maxilla ratio is 1:1, whereas in adults: MEC is slightly more common in women and the posterior mandible. [6] In this case the lesion was seen in 16 yr female patient. The pathogenesis of intraosseous MEC is much debated. It may originate from, [7] • Entrapment of retromolar mucus glands within the…

QUESTION No 1 How eggs and sperms are produced? Explain in detail the mechanism of fusion of Egg and sperm in human? ANSWER: Gametogenesis is the formation of the sex cells in multicellular eukaryotes. The word Gameto mean the gametes and genesis for formation of . Gametes typically come in male (sperm) and female (eggs). In human , the process involves two specialized cell divisions. The purpose is to create a haploid cell able to be well-suited with another haploid cell. Sperms is formed…

The purpose of experiment A of exercise 1, is so that the students can observe Brownian movement. Brownian movement is the random movement of particles in a gas or liquid caused by the collision of molecules of the medium. This movement should be observed in the carmine slides by the irregular motion of the red pigment particles in the water solution. In experiment B of exercise 1,the students will investigate the process of osmosis and diffusion in a model membrane system and the effect of…

chemical reaction that cells consume or create. The aspects of cellular respiration are divided into three parts: glycolysis, Krebs cycle, and the electron transport chain. Glycolysis is the first cycle of cellular respiration that occurs in the cytoplasm. Glycolysis is the breaking down of glucose that forms pyruvate into two molecules of ATP. Two pathways start the process of glycolysis, aerobic and anaerobic. In aerobic respiration is the use of oxygen in cells. Anaerobic respiration is when…

purpose for cellular respiration is to convert the energy stored in glucose into ATP and photosynthesis to convert water and carbon into glucose. To begin with cellular respiration takes place in the cytoplasm specifically in the mitochondria and the cytosol in where glycolysis occurs. In the cytoplasm molecules break down into smaller molecules while releasing small amounts of energy. Likewise, in the mitochondria, the small molecules begin to react with other molecules producing carbon…

stages in cell division; prophase, pro-metaphase, metaphase, anaphase and telophase, they also contain a sixth stage called cytokinesis. Just before these stages take place there is interphase, which enlarges the cell, replicates the DNA and the cytoplasm from the parent cell to be later placed in each of the daughter cells and prepares for the cell to divide. It carries out these acts through G1, S and G2 stages. The last important instrument of cell cycle is meiosis, it is a type of sexual…

size and complexity of the DNA and cells of these organisms. The average eukaryotic cell has 25 times more DNA than a prokaryotic cell (Diffen, 2007). Location: Since Prokaryotes do not have membrane-bound organelles, it preserves its DNA in the cytoplasm where the replication takes place as well. Their rich cousins, however, the swanky eukaryotes, are far more elegant and ostentatious. Within theirs membrane, they have a variety of organelles, including a genetic “godown,” the nucleus, where…