Also within this layer of the cell are two different kinds of proteins integral and peripheral. Contained within this membrane are several organelles, which carry out all of the cell s functions. These organelles are present only in eukaryotes, of which plants are classified. Not all eukaryotes contain all of these organelles, though all plants do. Mitochondria are one organelle.
Ribosomes are other organelles which synthesize proteins.
The rough endoplasmic reticulum prepares proteins for export, and the smooth endoplasmic reticulum regulates calcium levels, breaks down toxic substances, and synthesizes steroids. The microfilaments and microtubles contribute to the support, movement, and division of cells. Cilia and flagella are used in transport. Cilia are very short hairs that are attached to a surface to aid things moving though it, while flagella are often the legs of microscopic organisms, enabling them to swim. It also synthesizes RNA and ribosomes.