Necrosis and apoptosis are differentiated by their causes, with necrosis being the accidental result of interactions with pathogens and apoptosis being the product of a programmed cell mechanism. These are the two major types of cell death in living, multicellular organisms. Despite this customary dichotomy, research indicates that the distinction between these two types of cell death are not as clear as was once thought.Know More
Necrosis results from the release of toxins from pathogens or other trauma to cells, sufficient to cause cell death. In general this cell death is not a purposeful effect of the pathogen. It is a side effect of its digestive processes. Somewhat confusingly, patches of dead tissue are identified as necroses, even when the cause of the cell death is unknown.
Apoptosis is a vital and regular part of overall organism function and is the programmed death of cells via the cells' own chemical processes. This occurs throughout the body and is necessary to make way for replacement cells as the old ones wear out. It also occurs in response to certain pathogens, particularly viruses, as a cell which destroys itself does not propagate the virus. Apoptosis begins with the destruction of the interior structures of the cell, often followed by a rupture of the membrane and absorption of its constituents by nearby cells. Sometimes, however, as in the outermost layers of the skin, the dead cells do not rupture but stay in place and continue to serve a function after death.Learn more about Cells
The primary differences in the features of plant cells and animal cells are the presence or absence of a cell wall, chloroplasts and centrioles. Plant cells have cell walls and chloroplasts, while animal cells lack such organelles; but instead, they contain centrioles. Additionally, the only plant cells that possess flagella are sex cells, whereas they are more common in a variety of animal cell types.Full Answer >
The primary differences between chloroplasts and mitochondria are that chloroplasts contain pigment molecules and thylakoid molecules, while mitochondria have respiratory enzymes that chloroplasts lack. Mitochondria appear in cytoplasm for cells that contain a nucleus, converting nutrients into fuel molecules for cells. Chloroplasts, on the other hand, are the portions of algae and plant cells in which photosynthesis occurs.Full Answer >
There are several key differences between plant and animal cells, such as cell wall structure, presence or absence of plastids, lysosomes and centrioles and shape of vacuoles. These characteristics are the primary and most distinct differences between plant and animal cells. However, they only exist in organisms classified as eukaryotic, and occur primarily in central organelles.Full Answer >
Animal and plant cells have differences in size, shape and in the organelles they possess, but also have many similar features. Both plant and animals are eukaryotes with a membrane and nucleus.Full Answer >