Northern Leopard Frog © Mike Lannoo (USGS) Frogs have a very interesting anatomy. They have highly specialized structures, such as a long, sticky tongue which they use to ... Read More

Proteins are very important molecules in our cells. By weight, proteins are collectively the major component of the dry weight of cells. Each protein within the body has a specific ... Read More

A team of researchers has discovered that a pregnancy hormone, prolactin, plays an important role in repairing damaged nerve cells. Prolactin repairs damaged nervous tissue by encouraging the production of ... Read More

Endangered Florida Panther USFWS photo by John & Karen Hollingsworth Endangered species are animals and plants that are on the verge of vanishing from the earth. These species ... Read More

Many biology students often wonder about the meanings of certain cell biology terms and words. What is a nucleus? What are sister chromatids? The Biology Glossary is a good resource ... Read More

Sex chromosome abnormalities occur as a result of chromosome mutations brought on by mutagens (like radiation) or problems that occur during meiosis. One type of mutation is caused by chromosome breakage. ... Read More

Advanced Placement Biology, or AP Biology, is a course taken by high school students in order to gain credit for introductory college level biology courses. Taking the course itself is ... Read More

Reptiles have been around for a long time. They are believed to have evolved from amphibians and have developed several adaptations for life out of water. Reptiles range in size ... Read More

Plant viruses are similar to animal viruses in most basic characteristics, but they can also be markedly different. Most plant viruses have RNA as the genetic material. There are two ... Read More

Courtesy U.S. Fish and Wildlife Service Did you know that polar bears look white, but they actually have black skin? Did you know that frogs have an ear ... Read More

Mendel noticed a 3:1 ratio in pod color of the F2 generation. © Steve Berg The principles that govern heredity were discovered by a monk named Gregor Mendel ... Read More

Juvenile Rhabdophis tigrinus snake. Courtesy Alan Savitsky. Researchers have discovered that a species of nonpoisonous Asian snake, Rhabdophis tigrinus, can become poisonous because of its diet. What do ... Read More