Answer:
Adaptive immune defense system consists of lymphocytes like B-lymphocytes and T- lymphocytes. B-lymphocytes provides humoral immunity while T- lymphocytes provide cell-mediated immunity to the body.
99% of lymphocytes circulate freely in the blood and lymph. B lymphocytes differentiate into plasma B cells and B memory cells when interact with antigen presented by T helper cells.
Then plasma cells secrete antibodies in the circulation which binds to extracellular antigens through antigen-binding site. Then the bounded antigen is recognized by receptors present on phagocytic cells. This receptor binds the Fc region of antigen bounded antibody and destroy the antigen by phagocytosis.
Crystal structure............... .........
Answer:
Both mitosis and meiosis are processes of cell division. They use the same steps for cell division, including prophase, metaphase, anaphase and telophase.
Differences between mitosis and meiosis:
Mitosis is the process of asexual reproduction, while meiosis involves sexual reproduction. Higher life forms, such human beings and animals undergo meiosis. The resulting offspring is genetically different in the case of meiosis, while the offspring is identical in the case of mitosis. Meiosis includes two steps of division, compared to the single step of mitosis. During the process of meiosis, the number of chromosomes is reduced by half, while in mitosis, they remain the same. Also, mitosis produces 2 diploid cells, while meiosis produces 4 haploid cells.
Explanation:
Answer:
A plant that has two alleles for a trait.
Explanation:
<em>Took the test</em>
Population decreases by 15.
Birth rate means more population (positive), death rate means less population (negative), immigration means more (positive), and emigration means less (negative). So, just add and subtract the appropriate numbers:
Negative 15 people means that the population decreases by 15.
