Cell biology is the study of cell structure and function, and it revolves around the concept that the cell is the fundamental unit of life. Focusing on the cell permits a detailed understanding of the tissues and organisms that cells compose. Some organisms have only one cell, while others are organized into cooperative groups with huge numbers of cells. On the whole, cell biology focuses on the structure and function of a cell, from the most general properties shared by all cells, to the unique, highly intricate functions particular to specialized cells.
The sperm cells also carry the X or Y chromosome that determines the sex of the future child. spermAsperm cell attempting to penetrate an egg (ovum) to fertilize it. www.pdimages.com. Covering the head of the sperm is a cap known as the acrosome, which contains enzymes that help sperm to enter an egg.
The Prokaryotic Cell. Prokaryotes are unicellularorganisms that lack organelles or other internalmembrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-strandedDNA located in an area of the cell called the nucleoid
Unlike prokaryotic cells, eukaryotic cells have: A membrane-bound nucleus, a central cavity surrounded by membrane that houses the cell's genetic material. A number of membrane-bound organelles, compartments with specialized functions that float in the cytosol.
Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body’s hereditary material and can make copies of themselves.