Answer:
B cells produce antigen specific antibodies.
Explanation:
Adaptive Immunity:
- The adaptive or acquired immune system is an immune response system characterized by highly specific effector cells and immunoglobulins. Adaptive immune response identifies specific antigens and then elicits an immune response mediated by specific antibodies.
- Antibodies are exclusively produced by B-cells when they are activated by an antigen either directly through the B-cell receptor or through activation by T-helper cells.
- Once activated, B-cells proliferate into plasma cells and memory B-cells. Plasma cells can be thought of as antibody factories as they produce antigen specific antibodies.
- Memory B-cells remember the antigen and are able to elicit an immune response in case of further infections from the same pathogen.
Answer:
A gene is an extremely specific sequence of nucleotide monomers that has the ability to completely or partially control the expression of one or more traits in every type of living organism. Genes are formed from deoxyribonucleic acid (DNA) and, in the case of some viruses, ribonucleic acid (RNA) polymers.
Explanation:
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Answer:
The statement World empires in Asia that relied upon large-scale irrigation and drainage schemes for agricultural productivity are known as hydraulic societies is true.
Explanation:
Agricultural productivity is measured as the ratio of agricultural outputs to agricultural inputs. While distinct goods are generally measured by weight, their changing concentrations make calculating complete farming output problematic. Since 1948, U.S. agricultural productivity has more than doubled, enabling farmers to feed more people with less land and labor. Agricultural output growth is attributed to the growth in total inputs used and in technology advancement, or total factor productivity. The hydraulic society is the Societies in which institutions are closely linked to the development and control of systems of irrigation and, sometimes, water-based transport.
Answer:
the answer is the first one
Answer:
Reproductive isolation is a mechanism that keeps species from mating with others. Prezygotic isolation prevents the fertilization of eggs while postzygotic isolation prevents the formation of fertile offspring. ... Postzygotic mechanisms include hybrid inviability, hybrid sterility and hybrid "breakdown." i hope this helped you.
