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acellular |
composed of only one cell; unicellular (used esp. in reference to protozoans and ciliates). [1/2 definitions] |
actin |
any of a group of contractile proteins, including proteins involved in muscle contraction, cell motility, and maintenance of cellular shape. |
alveolus |
a small cavity or pit, such as one of the terminal air sacs of the lungs or one cell of a honeycomb. [1/2 definitions] |
amitosis |
direct cell division in which the nucleus divides without the formation of chromosomes. (Cf. mitosis.) |
amoeba |
a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope. |
amoebocyte |
a cell that resembles or moves like an amoeba, such as a leukocyte. |
apoptosis |
genetically regulated cell death that occurs as a normal part of growth and development, and which also occurs when a cell becomes damaged. |
app |
a computer application designed for mobile operating systems and devices, such as cell phones. [1/2 definitions] |
arachidonic acid |
an unsaturated fatty acid that is an important component of the cell membrane and is considered an essential nutrient in the diet of most mammals, including humans. |
axon |
the part of a nerve cell that conducts impulses away from the cell body. |
bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes. |
bacterium |
singular form of "bacteria." Bacteria are tiny living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people, but some are harmful because they can cause disease. |
basidiomycete |
any of the fungi, such as mushrooms, puffballs, and smuts, that bear spores on a club-shaped cell. |
basophil |
a tissue, substance, or cell, esp. a white blood cell, that readily takes on basic dyes. |
B cell |
a type of white blood cell, produced in the bone marrow, that makes antibodies that fight off disease. |
bilayer |
biological material composed of two layers of molecules, such as lipids in a cell membrane. |
-blast |
bud, embryo, cell layer, or other generative unit. |
brain cell |
a cell in the brain, esp. a neuron. |
bull pen |
(informal) a place, usu. a cell, where prisoners are kept temporarily. [1/3 definitions] |
cell line |
a cell culture produced from a single cell. |
cellmate |
a person that one shares a prison or jail cell with. |
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