Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Biology A words
Praxis study
| Term | Definition |
|---|---|
| ABIOTIC | nonliving factor in as ecosystem, such as moisture, temperature, wind, sunlight, soil, and minerals |
| ABO blood group | four common blood types (A,B, AB, and O) and the protein markers that distinguish them |
| abyssal zone | depth of the ocean that lies below 2000 meters and is in complete darkness |
| acid | compound that donates a proton (H+) when dissolved in a solution |
| acid rain | precipitation produced when pollutants in the atmosphere cause the pH of rain to decrease |
| actin | filament that s pulled by myosin filaments to cause muscle contraction |
| action potential | fast, moving change in electrical charge across a neuron's membrane, also called impulse |
| activation energy | energy input necessary to inititate a chemical reaction |
| active immunity | immunity that occurs after the body responds to an antigen |
| active transport | energy-requiring movement of molecules across a membrane from region of lower concentration to a region of higher concentration |
| adaptation | inherited trait that is selected for over time because it allows organisms to better survive in their environment |
| adaptive radiation | process by which one species evolves and gives rise to many descendant species that occupy different ecological niches |
| adenosine diphosphate (ADP) | low-energy molecule that can be converted to ATP |
| adenosine triphosphate (ATP) | high-energy molecule that contains, within its bonds, energy that cells can use |
| adhesion | attraction between molecules of different substances |
| adolescence | period of life begining at puberty and ending at adulthood |
| aerobic | process that requires oxygen to occur |
| airfoil | surface, such as a bird's wing, whose shape moves air faster over the top than underneath it, allowing for flight |
| air sac | air-filled space that connects to a bird's lungs, aiding in breathing |
| algae | photosynthetic plantlike protists |
| alkaloid | chemcial produced by plants that contains nitrogen, many of which are used in medicines |
| allele | any of the alternative forms of a gene that occurs at a specific place on a chromosome |
| allele frequency | proportion of one allele, compared with all the alleles for that trait in the gene pool |
| allergen | antigen that does not cause disease but stillproduces an immune response |
| allergy | immune response that occurs when the body responds to a nondisease-causing antigen, such as pollen or animal dander |
| alternation of generations | plant life cycle in which the plant alternates between haploid and diploids phases |
| altruism | behavior in which an animal reduces its own fitness to help the other memebers of it social group |
| alveolus | tiny, thin-walled structure across with oxygen gas is absorbed and carbon dioxide is released in the lungs |
| amino acid | molecule that makes up proteins; composed of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur |
| amniote | vertebrate whose embryo or fetus is enclosed by a thin tough membranous sac |
| amniotic egg | waterproof container that allows an embryo to develop out of water and externally from the mother without drying out |
| amniotic sac | fluid-filled organ that cushions and protects the developing embryo of some vertebrates |
| amphibian | vertebrate that can live on land and in water |
| anaerobic | process that does not require oxygen to occur |
| analogous structure | body part that is similar in function as a body part of another organism but is structrually different |
| anaphase | third phase of mitosis during which chromatides seperate and are pulled to opposite sides of the cell |
| anaphylaxis | severe allergic reaction that causes airways to tighten and blood vessels to leak |
| angiosperm | seed plant whose embryos are enclosed by fruit |
| anthropoid | humanlike primate |
| antibiotic | chemcial that kills or slows the growth of bacteria |
| antibiotic resistance | process by which bateria mutate so that they are no longer affected by an antibiotic |
| antibody | protein produced by B cells that aids in the destruction of pathogens |
| anticodon | set of three nucleotides in a tRNA molecule that binds to a complementary mRNA codon during translation |
| antigen | protein marker that helps the immune system identify foreign particles |
| antiseptic | chemical such as soap vinegar or rubbing alcohol that destroys pathogens outside the body |
| apoptosis | programmed cell death |
| appendage | extension such as an antenna or arm that is attached to the body |
| appendicular skeleton | part of the skeletal systme that allows for most of the body's movement, includes bones of the arms shoulders, legs and pelvis |
| arachnid | terrestrial chelicerate, such as a spider |
| Archaea | one of the three domains of life, containing singel-celled prokaryotes in the kingdom Archaea |
| artery | large blood vessel that carries blood away from teh heart |
| arthropod | invertebrate with an exoskeleton jointed appendages and a segmented body |
| artificial selcetion | process by which humans modify a species by breeding it for certain traits |
| asexual reproduction | process by which offspring are produced from a single parent; does not involve the joining of gametes |
| ATP synthase | enzyme that catalyzes the reaction that adds a high-energy phosphate group to ADP to form ATP |
| atrium | small chamber in the human heart that receives blood from the veins |
| autonomic nervous system | division of teh peripheral nervous system that controls involuntary functions |
| autosome | chromosome that contains genes for characteristics not directly related to the sex of the organism |
| autrotoph | organism that obtains its energy from abiotic sources such as sunlight or inorganic chemcials |
| auxin | plant hormone that stimulates the lengthening of cells in the growing tip |
| axial sekelton | part of the skeletal system that supports the body's weight and protects the body's interanl tissues, includes the bones of the skull, spial column, and rib cage |
| axon | long extension of neuron membrane that carries impulses from one neuron to another |
Created by:
mitromar
Popular Biology sets