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.
Cells can have one, or many nucleoli, depending on how many ribosomes that cell needs. Lesson Summary. All plant cells contain a nucleus, a structure that stores DNA and acts as a cell's command center. It is surrounded by the nuclear envelope and is filled with nucleoplasm. The nuclear envelope contains nuclear pores which allow molecules with the appropriate nuclear import and export signals in and out of the nucleus.