chemicals that are secreted from antigen-presenting cells then activate helper T cells describes the role of cell-to-cell communication during a response to an invasion of antigens.
Explanation: Antibodies are present on the surface of the cells, and binds specifically to antigens and can also engulf pathogen and process these cells presenting them to MHC class 2. This complex is activated by helper T cells to secrete antibodies and macrophages. This interaction of B-cell and MHC class 2 complex with helper T cell is cell-mediated immune response.
Answer:
Venus is the second planet from the sun and has a temperature that is maintained at 462 degrees Celsius, no matter where you go on the planet. It is the hottest planet in the solar system. ... This thick atmosphere makes the surface of Venus hotter because the heat doesn't escape back into space.
Answer:
a Paul and Jennifer university are stadying
The correct answer is D
As compared to nuclear DNA, the mtDNA (mitochondrial DNA) experiences very less mutations. Due to this slow mutation rates, it does not change much over the time. It makes it a good candidate for studying the evolutionary relationship between the species.
In addition, it is mainly inherited from mother’s cytoplasm which also allows the scientists to trace back the maternal ancestral lineage.
I think the answer is A and E although i am not that sure. Hope this helps!
