Answer: Option B) is a foreign molecule that evokes a specific response by a lymphocyte
Explanation:
An antigen is a large, foreign molecule (such as a protein) that stimulates the host organism to secrete lymphocytes and specific antibodies that bind to the foreign molecule, labelling it as foreign and destined for destruction.
Thus, option B is the answer
Answer:
Explanation:
they are identified by routinely morphological and biochemical tests
Answer:
The cell membrane is selectively permeable . It lets some substances pass through rapidly and some substances pass through more slowly, but prevents other substances passing through it at all. Some small molecules such as water, oxygen and carbon dioxide can pass directly through the phospholipids in the cell membrane
Its as a result of unequal coiling of wires.
A transformer has two separate windings i.e primary and secondary. The Ratio of primary coils to secondary coils (turn ratio Np/Ns) is the one which makes it a step down or step up transformer. Step up transformer increases the voltage while step down transformers reduce it.
