Answer:
In prophase, the nucleolus disappears and chromosomes condense and become visible. In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores. In metaphase, chromosomes are lined up and each sister chromatid is attached to a spindle fiber.
Explanation:
we can get them from eating foods that contain protein bio molecules
Answer:
True
Explanation:
Because they come across many challenges
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.
Convergent oceanic- continental boundary