Acute kidney tubular necrosis is caused when blood cannot reach the tissues and cells of the kidneys due to a blockage or restriction. This causes damage. Acute kidney tubular necrosis is caused when blood cannot reach the tissues and cells of the kidneys due to a blockage or restriction.
Free ribosomes freely float in the cytoplasm of the cell and the membrane-bound ribosomes bind to the nuclear membrane or to the endoplasmic reticulum. Ribosome function is vital for the production of proteins, or polypeptide chains, from the mRNA.
Ribosomes can also be found in mitochondria and chloroplasts of eukaryotic cells. Initiation of Protein Synthesis. Ribosomes synthesize proteins in both prokaryotic and eukaryotic cells, but the process is initiated differently in each cell type.