Every mature mhc-restricted b cell expresses either cd4+ or cd8+ co-receptors a. true b. false

Every mature MHC-restricted B cell expresses CD4^{+}  or CD8^{+}    co-receptors. This statement is true.

Further Explanation:

Major Histocompatibility Complex is a very strongly related group of genes represented in each and every mammalian species. It is mainly a collection of the genes present on chromosome six and mainly code for three classes of MHC molecule.

CD4^{+}  cells are mainly called T4 cells and they are “helper” cells. They attack against infections in the body.  CD8^{+}  cells are also called suppressor cells or Tc cells that mainly complete the action of the immune response.  They are also referred to as killer cells because they mainly attack cancer cells.

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Answer Details:

Grade: High School  

Subject: Biology

Chapter: Immunology

Keywords:  

Cells, nucleated, killer cells, helper cells, glycoproteins, expressed, encode, surface, variety, expressed, peptide, antigen, secreted protein, attack, against infection.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."