sm pl biol
41asexual reproduction — Biol. reproduction, as budding, fission, or spore formation, not involving the union of gametes. * * * …
42B cell — Biol. 1. Also called B lymphocyte. a type of lymphocyte, developed in bone marrow, that circulates in the blood and lymph and, upon encountering a particular foreign antigen, differentiates into a clone of plasma cells that secrete a specific… …
43bilateral symmetry — Biol. a basic body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline. Cf. radial symmetry. [1850 55] * * * …
44binary fission — Biol. fission into two organisms approximately equal in size. Cf. multiple fission. [1895 1900] * * * ▪ cell division asexual reproduction by a separation of the body into two new bodies. In the process of binary fission, an organism… …
45blast cell — Biol. any undifferentiated or immature cell. [1950 55] * * * …
46blue-green algae — Biol. a widely distributed group of predominantly photosynthetic prokaryotic organisms of the subkingdom Cyanophyta, resembling phototrophic bacteria, occurring singly or in colonies in diverse habitats: some species can fix atmospheric nitrogen …
47bone cell — Biol. a cell found in bone in any of its functional states; an osteoblast, osteoclast, or osteocyte. [1830 40] * * * …
48cell body — Biol. the compact area of a nerve cell that constitutes the nucleus and surrounding cytoplasm, excluding the axons and dendrites. Also called perikaryon. [1875 80] * * * …
49cell division — Biol. the division of a cell in reproduction or growth. [1880 85] * * * the process by which cells reproduce. See meiosis; mitosis. * * * …
50cell fusion — Biol. the merging of two or more cells into a single cell. [1970 75] * * * …
