Biology glossary

structure consisting of two or more alveoli that share a common opening

how much air is in the alveoli

(plural: alveoli) (also, air sac) terminal region of the lung where gas exchange occurs

neurodegenerative disorder characterized by problems with memory and thinking

monomer of a protein; has a central carbon or alpha carbon to which an amino group, a carboxyl group, a hydrogen, and an R group or side chain is attached; the R group is different for the most common 20 amino acids.

hormone derived from amino acids

enzyme that “charges” tRNA molecules by catalyzing a bond between the tRNA and a corresponding amino acid

protease that breaks down peptides to single amino acids; secreted by the brush border of small intestine

compound made of one nitrogen atom and three hydrogen atoms

process by which ammonia is released during the decomposition of nitrogen-containing organic compounds

describes an animal that excretes ammonia as the primary waste material

membrane of the egg that protects the embryo from mechanical shock and prevents dehydration

animal that produces a terrestrially adapted egg protected by amniotic membranes

sponge cell with multiple functions, including nutrient delivery, egg formation, sperm delivery, and cell differentiation

joint that allows slight movement; includes syndesmoses and symphyses