A type of lymphocyte that develops in the bone marrow and later produces antibodies, which mediate humoral immunity.

One of two prokaryotic domains, the other being the Archaea.

One of two prokaryotic domains, the other being the Archaea.

[L. bacterium + Gk. phagein, to eat] A virus that parasitizes a bacterial cell.

A prokaryotic microorganism in Domain Bacteria.

A type of polymorphism in which the frequencies of the coexisting forms do not change noticeably over many generations.

All tissues external to the vascular cambium in a plant growing in thickness, consisting of phloem, phelloderm, cork cambium, and cork.

A dense object lying along the inside of the nuclear envelope in female mammalian cells, representing an inactivated X chromosome.

[Gk. basis, foundation] A eukaryotic cell organelle consisting of a 9 + 0 arrangement of microtubule triplets; may organize the microtubule assembly of a cilium or flagellum; structurally identical to [..]

[Gk. basis, foundation + metabole, change] The minimal number of kilocalories a resting animal requires to fuel itself for a given time.