Are you a chemistry student? Visit A-Level Chemistry to download comprehensive revision materials - for UK or international students!


Frenulum 1

Defining Frenulum: In simple terms, a frenulum can be defined as a small ridge or skin fold, which helps to hold a partially mobile body part. When it comes to human body, the frenulum can be found in various parts. Examples are: On the penis of males In the female genitalia Inside the lips Under … Read more


Definition: The term “Nondisjunction” refers to the type of chromosome in which the homologous chromosomes will fail to divide properly during the process of cell division. The process would result in gametes with an additional or a missing chromosome. The condition that involves the loss or gain of the single chromosome is referred to as … Read more

Secondary Consumer

Secondary Consumer Definition As the name implies, a secondary consumer is the consumer organism that occupies the second position on the food chain. As such, these are organisms that eat primary consumers for obtaining energy. Here, a primary consumer can be defined as the organism (animals) that consume only plants. However, not all secondary consumers … Read more