Maternal and fetal tissues form two units that are closely bound together at the placental level. Quiz. The fetal part of the placenta is made up of the chorionic plate with its placental villi, the cytotrophoblast layer and the intervillous spaces.
1 , which performs the function of photosynthesis. 2  Chloroplasts are double-membrane-bound, like mitochondria. 3  Also like mitochondria, their inner membrane is very complicated. 4  In fact, it's formed into many thylakoid structures which perform the same function performed by the thylakoids in prokaryotic cells.
A prokaryotic cell does not contain well-defined membrane-bound organelles. Most of the organelles which a eukaryotic cell contains are absent in a prokaryotic cell. The lysosome is one among them. Lysosomes are small membrane-bound sac-like structures which release digestive enzymes that break down food. They act as a waste bin of the cell and keep the cell clean. Lysosomes are present in eukaryotic cells but a prokaryotic cell lacks them.