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26.2: B

Created by: CK-12
Bacteria
domain of prokaryotes, some of which cause human diseases
bark
tissue that provides a rough, woody external covering on the stems of trees
base
solution with a pH higher than 7
B cell
type of lymphocyte that fights infections by forming antibodies
bilateral symmetry
symmetry of a body plan in which there are distinct head and tail ends, so the body can be divided into two identical right and left halves
bile
fluid produced by the liver and stored in the gall bladder that is secreted into the small intestine to help digest lipids and neutralize acid from the stomach
binary fission
type of cell division that occurs in prokaryotic cells in which a parent cells divides into two identical daughter cells
binomial nomenclature
method of naming species with two names, consisting of the genus name and species name
biochemical reaction
chemical reaction that occurs inside the cells of living things
biodiversity
the variety of life and its processes; including the variety of living organisms, the genetic differences among them, and the communities and ecosystems in which they occur
biofilm
colony of prokaryotes that is stuck to a surface such as a rock or a host’s tissue
biogeochemical cycle
interconnected pathways through which water or a chemical element such as carbon is continuously recycled through the biotic and abiotic components of the biosphere
biogeography
study of how and why plants and animals live where they do
biology
science of life, study of life
biomass
total mass of organisms at a trophic level
biome
group of similar ecosystems with the same general type of physical environment
biosphere
part of Earth where all life exists, including land, water, and air
biotechnology
use of technology to change the genetic makeup of living things in order to produce useful products
bioterrorism
intentional release or spread of agents of disease
biotic factor
living aspects of the environment, including organisms of the same and different species
bird
bipedal, endothermic, tetrapod vertebrate that lays amniotic eggs and has wings and feathers
bladder
hollow, sac-like organ that stores urine until it is excreted from the body
blastocyst
fluid-filled ball of cells that develops a few days after fertilization in humans
blood
fluid connective tissue that circulates throughout the body through blood vessels
blood pressure
force exerted by circulating blood on the walls of blood vessels
blood type
genetic characteristic associated with the presence or absence of antigens on the surface of red blood cells
body mass index (BMI)
estimate of the fat content of the body calculated by dividing a person’s weight (in kilograms) by the square of the person’s height (in meters)
bone
hard tissue in most vertebrates that consists of a collagen matrix, or framework, filled in with minerals such a calcium
bone marrow
soft connective tissue in spongy bone that produces blood cells
bone matrix
rigid framework of bone that consists of tough protein fibers and mineral crystals
brain
central nervous system organ inside the skull that is the control center of the nervous system
brain stem
lowest part of the brain that connects the brain with the spinal cord and controls unconscious functions such as heart rate and breathing
bryophyte
type of plant that lacks vascular tissues, such as a liverwort, hornwort, or moss
budding
type of asexual reproduction in yeasts in which an offspring cell pinches off from the parent cell

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Feb 23, 2012

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Nov 20, 2014
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CK.SCI.ENG.SE.1.Biology.26.2

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