Single-celled organisms

The cell above is called caulerpa. Interestingly, this is a single-celled organism, and is quite a large one at that. This may be one of the largest single-celled organisms on the earth. It grows in the sea and divides itself into compartments, the little round balls being part of the whole single-celled plant. These fluid-filled sacs carry nutrients, which is how it can still sustain itself while being so large. It contains a nuclear membrane, with the nuclear pores and nucleolous and chloroplasts. It has all the other common organelles that plants cells have, like vesicles, ribosomes, golgi, endoplasmic reticulum, and vacuoles. It also has cytoplasm, microtubules, and a cell wall. The really interesting thing is that the whole thing is amazingly just one cell.

Sickle-Cell Anemia
Sickle-Cell Anemia is a disease that is passed through red blood cells. The cells, which are normally shaped like discs, are distorted and have a more crescent shape. The distortion is cause by the hemoglobin inside the cell, which is mutated and happens especially when there is low oxygen. These distorted cells deliver less oxygen to the body's tissues, which in turn can cause pain to the person who has it. This person may experience pain episodes for up to hours, and they can be as often as daily or one a year.