Cell Biology

Passive transport occurs when no energy is required to move a substance, such as water or carbon dioxide, from an area of high concentration to an area of low concentration until the concentration is equal, sometimes across a membrane. The high-to-low concentration gradient is the driving force for passive transport …

The chloroplast is the green plastid in land plants, algae, and some protists. Chloroplasts are found in all green plans and in some blue green algae. As the site in the cell where photosynthesis takes place, chloroplasts are responsible for much of the world’s primary productivity, making chloroplasts essential to …

Chromatin is the combination of DNA and proteins that make up the contents of the nucleus of a cell. The primary functions of chromatin are: to package DNA into a smaller volume to fit in the cell, to strengthen the DNA to allow mitosis and meiosis and prevent DNA damage, …

Active transport is a cellular mechanism by which molecules cross the cell membrane against a concentration gradient, that is, from an area of low concentration to high concentration other with the consequent energy. Typical examples are the sodium-potassium pump, the pump simply calcium or glucose transport. (Check-in Biochemistry Dictionary) In …

Peroxisomes are usually spherical and about 0.8µ in diameter. It was first discovered by Tolbert (1968) from Spinach leaf and was obtained by density gradient centrifugation. Another name of Peroxisome is Microbodies. Both plants and animal cells contain different kinds of membrane-bounded structures called Peroxisome which participates in metabolic oxidations …

Gene families are teams of DNA segments that have developed by frequent descent by duplication and divergence. They’re a number of DNA segments that have developed from one widespread ancestral DNA phase that has been copied and altered over hundreds of thousands of years. What is the Fidelity of DNA …