Missense Mutation

Missense Mutation

Missense Mutation Definition A missense mutation is a type of point mutation in which a different amino acid is placed within the produced protein, other than the original. In the process of converting DNA into protein, the language of DNA must be translated into the language of proteins. During this process, a change in the … Read more

Horny Toad

Simple Columnar Epithelium

The Basics Horny Toads are a genus of lizard adapted to the desert that boasts a number of large horns on the backside of their skull. Horny toads are in the genus Phrynosoma – meaning “toad-bodied” – a reference to the very short tails of horny toads. There are around 22 different species, found mostly throughout … Read more


Phagocytosis Definition Phagocytosis, or “cell eating”, is the process by which a cell engulfs a particle and digests it. The word phagocytosis comes from the Greek phago-, meaning “devouring”, and -cyte, meaning “cell”.  Cells in the immune systems of organisms use phagocytosis to devour bodily intruders such as bacteria, and they also engulf and get … Read more

Cricoid Cartilage

Polar Molecule

Definition Cricoid cartilage is part of the larynx (just below the pharynx), and sits on a level plane just below the thyroid gland and thyroid cartilage. It is a circular piece of hyaline cartilage which wraps completely around the trachea, providing a place of attachment for various ligaments, muscles and other cartilage. Overview While the … Read more



Hermaphrodite Definition A hermaphrodite is an organism with both male and female genitalia. In sexually reproducing organisms, males have organs that produce male gametes, usually sperm. Females have different sexual organs that produce female gametes, usually called eggs. In sexually dimorphic organisms, each organism only has type of reproductive organs, and the population is divided … Read more


Overpopulation Definition Overpopulation refers to a population which exceeds its sustainable size within a particular environment or habitat. Overpopulation results from an increased birth rate, decreased death rate, the immigration to a new ecological niche with fewer predators, or the sudden decline in available resources.  Therefore, overpopulation describes a situation in which a population in … Read more



Microfilament Definition Microfilaments, also called actin filaments, are polymers of the protein actin that are part of a cell’s cytoskeleton. The cytoskeleton is the network of protein filaments that extends throughout the cell, giving the cell structure and keeping organelles in place.  Microfilaments are the smallest filaments of the cytoskeleton. They have roles in cell … Read more


The Basics “Zonkeys” are hybrid animals produced by mating zebras and donkeys. Zonkeys are not a true species because they have an odd number of chromosomes and cannot reproduce. While zonkeys are rare, they are bred in a number of zoos and specialized farms around the world. Zonkeys are also referred to as zebonkey, zebrinny, … Read more