Cytoplasm

These are considered to be the cellular machinery that interacts with the charged tRNA, the mRNA and proteins that leads to Translation occurring. The Ribosome is a Ribonucleoprotein found floating freely in the cytoplasm of a cell or attached to Endoplasmic Reticulum forming the Rough Endoplasmic Reticulum. The number of ribosomes that are found in a cell depends on the cell activity of that organism. They are small particles of about 200 Angstroms. The Ribosome…

Every cell in the body has a nucleus. The nucleus is the largest organelle and is contained within a membrane. The nucleus contains the body’s genetic material, which directs the activities, like the brain of the cell. This is built from DNA and proteins called histones coiled together forming a fine network of threads called chromatin. When under the microscope the most prominent part of the cell is the nucleus. The most visible structure within the nucleus is the nucleolus, which is where…

Microtubules, which are made of protein subunits called tubulin, are the thickest of all three cytoskeletal filaments. Microtubules are mainly serving as the paths along which vesicles are guided in their travels to various destinations, and are responsible for associating with motor proteins attached to the vesicles. Microtubules can also expand or shrink in length in order to establish dynamic structures that can efficiently change the internal organization of the cell, and capture organelles…

gives it shape. • Chloroplast - the sites of photosynthesis in a plant cell. They contain chlorophyll, a green pigment that absorbs energy from sunlight. • Cytoplasm - gel-like substance within the cell membrane containing water, enzymes, salts, organelles, and various organic molecules. • Cytoskeleton - a network of fibers throughout the cytoplasm that helps the cell maintain its shape and gives support to the cell. • Endoplasmic Reticulum (ER) - extensive network of membranes composed of both…

for energy used in all cellular functions. In liver cells, they have numerous mitochondria because of the metabolic activities that are carried out within the cell. The mitochondria resemble beans with an oblong shape, and they are found in the cytoplasm. Having seen the above organelles, at the center of the cell, there is a specialized organelle known as the nucleus whose function to process information as the administrative center. After the various activities that take place inside the cell,…

MITOCHONDRIAL SRUCTURE Mitochondria can be seen in the light microscope, but their detailed internal structure is only revealed by electron microscopy. As ubiquitous, semi-autonomous cellular organelles, mitochondria are separated from the cytoplasm by the outer and inner mitochondrial membrane.The outer membrane is porous and freely traversed by ions and small, uncharged molecules through pore-forming membrane proteins (porins), such as the voltage-dependent anion channel VDAC [19]. Any larger…

In situ carcinoma In situ carcinomas are malignant epithelial growths that are limited to the acini, terminal ductules, or ductal system of the breast without invasion into the surrounding breast stroma. (25) 1) Ductal carcinoma in situ (DCIS): also known as intraductal carcinoma is considered noninvasive or pre-invasive breast cancer, DCIS means a malignant proliferation of epithelial cells, confined to the lumen of ducts. In situ carcinomas were divided into three grades:…

Mitochondrion is an organelle that exists within the cytoplasm of eukaryote cells, they are considered to be one of the most important organelles. Mitochondrion is usually oval in shape and can vary in size from 0.5 - 1µm. Mitochondrion is composed of a double membrane, the outer membrane is smooth and encompasses the organelle whereas the inner membrane is folded to form layered structures called cristae. In between the outer and inner membrane, is an area called the…

replicate itself. The DNA contains the instructions for the building of specific proteins and the code for certain traits. However, where DNA is structurally in the cell is different between prokaryotes and eukaryotes. In prokaryotes, the DNA is in the cytoplasm, but specifically it is concentrated in the nucleoid region. In eukaryotes, the DNA is all contained and stored in the nucleus. Prokaryotes and eukaryotes also contain ribosomes. Ribosomes are small, roughly spherical organelles without…

occur by second messenger. Being lipid soluble causes the hormones to pass directly through the target cell’s plasma membrane. Once inside, the hormones pass through the cytoplasm and enter the nucleus. In the nucleus, they bind with a receptor to form a hormone-receptor complex. It acts on DNA which causes the formation in the cytoplasm then produces special effects in the target cell.…