lymphocyte that matures in the thymus gland; one of the main cells involved in the adaptive immune system

clade that includes the echidna or spiny anteater

larval stage of a frog

type of root system with a main root that grows vertically with few lateral roots; found in dicots

cell that has a receptor for a signal or ligand from a signaling cell

one of the seven bones of the ankle

food molecule that stimulates gustatory receptors

clusters of taste cells

conserved promoter sequence in eukaryotes and prokaryotes that helps to establish the initiation site for transcription

directed movement in response to a stimulus

(also citric acid cycle) alternate name for the citric acid cycle, named after the group name for citric acid, tricarboxylic acid (TCA); see citric acid cycle

inner layer of the seed coat

polymer associated with the cell wall of Gram-positive bacteria

enzyme that contains a catalytic part and an inbuilt RNA template; it functions to maintain telomeres at chromosome ends

DNA at the end of linear chromosomes