science-biology

Autotroph originates from Greek auto- (self) and trophe (nourishment), literally meaning "self-feeding" or "self-nourishing." In biology, an autotroph is an organism that produc...

DNA stores the instructions an organism uses to grow, function, and reproduce. Those instructions are encoded in sequences of four chemical bases—often described as the four b...

Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are nucleic acids that store, transmit, and execute hereditary information in living organisms. DNA serves as the long-ter...

Symbiosis describes the close, long-term interactions between different species, and understanding the types of symbiosis in biology clarifies how these relationships shape ecos...

The biosphere level of organization encompasses all living organisms and the environments they inhabit across Earth, forming the narrow zone where life interacts with atmosphere...

The primary function of ribosomes in protein synthesis is to translate messenger RNA (mRNA) sequences into polypeptides by coordinating transfer RNA (tRNA) binding and catalyzin...

Cellular respiration occurs when cells need ATP and have access to reactants that support energy extraction pathways. It begins when ATP demand rises and substrates—such as gl...

A DNA nucleotide has three required components: a phosphate group, a deoxyribose sugar, and a nitrogenous base. These molecules assemble into a nucleotide monomer, which polymer...

Nitrogenous bases are organic molecules that contain nitrogen and serve as the fundamental alphabet for genetic information in cells. They are the subunits of nucleic acids, pri...

The cell membrane—also called the plasma membrane—is a dynamic, semi-permeable barrier that separates the cell’s interior from its external environment while enabling cont...