Explore the archive
Ask a biology question, or look up a molecule, gene, pathway, or identifier.
Concepts
47 recordsThe Cell · The cell
The smallest unit that can carry out the processes of life.
Allele
One of the alternative DNA sequence forms found at a particular genetic locus.
Amino Acids · Protein-building amino-acid set
Meet the 20 standard amino acids that build most proteins, plus selenocysteine and pyrrolysine, two rare amino acids that some organisms encode directly.
Antibiotic
A medicine that kills or inhibits susceptible bacteria; antibiotics do not treat viral infections.
Antigen
A molecular structure that can be specifically recognized by immune receptors or antibodies.
Biased Agonism · Biased agonism
A ligand-dependent preference for some receptor signaling routes over others.
Biogeochemical Cycles · Biogeochemical cycles
Transfers and transformations of elements among organisms and environmental reservoirs.
Cell Signaling · Cell signaling
How cells detect information and convert it into changes in behavior, chemistry, or gene activity.
Concentration Gradients · Concentration gradients
Differences in a molecule's concentration across space that can drive diffusion and help power transport.
DNA Base pair · DNA base pair
Two complementary DNA bases joined across opposite strands: adenine pairs with thymine, and cytosine with guanine.