Organ System Definition An organ system is a group of organs that work together to perform a certain function in an organism’s body. Most animals and plants have organs, which are self-contained groups of tissues such as the heart that work together to perform one function.  Humans and other mammals have many organ systems. An … Read more

Definition Nondisjunction occurs when chromosomes do not separate properly during cell division. This produces cells with imbalanced chromosome numbers. Chromosomes contain the cell’s DNA, which is crucial for its functions and reproduction. Normally, when a cell divides, the chromosomes line up in an orderly fashion at the centre of the cell. Then, when the cell … Read more

Methanol Definition Methanol, sometimes called “wood alcohol,” is a clear liquid with the chemical formula CH3OH. It is clear liquid with polar properties, making it a good solvent. It is also highly flammable, and highly toxic to humans if ingested. Historically, methanol was created when cellulose, the main sugar in wood and some other plants, … Read more

Phenotype Definition A phenotype is the physical expression of DNA. In contrast, the genotype is the chemical makeup of DNA that causes a particular phenotype. DNA is first transposed into RNA, a slightly different information molecule, which can then be translated into a protein. Phenotypes are caused by the interactions of the many different proteins … Read more

Definition The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell. It separates the cytoplasm (the contents of the cell) from the external environment. It is a feature of all cells, both prokaryotic and eukaryotic. Function of the Cell Membrane The cell membrane gives … Read more

Long-term memory can be classified into two fundamental types: implicit and explicit memory. These two systems reflect different states of awareness and involve distinct neural processes. Despite their clear distinction, evidence suggests that implicit memory can influence explicit memory. Implicit Memory Implicit memory refers to unconscious memories. They are often tricky to articulate and explain … Read more

Transpiration Definition Transpiration is the evaporation of water from plants. Most of the water absorbed by the roots of a plant—as much as 99.5 percent—is not used for growth or metabolism; it is excess water, and it leaves the plant through transpiration.  Transpiration is very important for maintaining moisture conditions in the environment. As much … Read more

Pseudocoelomate Definition A pseudocoelomate is an organism with body cavity that is not derived from the mesoderm, as in a true coelom, or body cavity. A pseudocoelomate is also known as a blastocoelomate, as the body cavity is derived from the blastocoel, or cavity within the embryo.  A true coelom is lined with a peritoneum … Read more

The Basics It lives in deciduous forests, grasslands, and wetlands at elevations around 11,000 feet across Asia and is mostly herbivorous. A white patch on its chest distinguishes this bear from its cousin, the American Black Bear, though it is a bit more nimble. Insect larvae, plants and mushrooms, as well as human garbage are … Read more