By definition, basalt is an aphanitic igneous rock with less than 20% quartz and less than 10% feldspathoid by volume, and where at least 65% of the feldspar is in the form of plagioclase. Basalt features a glassy matrix interspersed with minerals.The average density is 3.0 gm/cm 3.y definition, basalt is an aphanitic igneous rock with less than 20% quartz and less than 10% feldspathoid by volume, and where at least 65% of the feldspar is in the form of plagioclase. Basalt features a glassy matrix interspersed with minerals.
An antigen is defined as a substance that reacts with antibody molecules and antigen receptors on lymphocytes. 2. An immunogen is an antigen that is recognized by the body as non-self and stimulates an adaptive immune response. 3. Chemically, antigens are large molecular weight proteins and polysaccharides. 4.
show/hide words to know. 1  Antigen: a molecule that can be recognized by the immune system... 2  more. 3  Cytotoxins: chemicals that kill cells. 4  Lymph system: the network of vessels, tissues, and organs that immune cells use to move through the body.