The statements above are true;
In a host-versus-graft rejection the recipient's immune system recognizes the donor's tissue as foreign and rejects the transplant. On the other hand, in a graft-versus-host rejection, the donor tissue recognizes the recipient's tissue as foreign and the transplant rejects the recipient, causing destruction of the recipient's tissue and possibly death. Its important also to note that there are two types of rejection, the acute rejection, where the rejection of transplanted tissue that occurs several weeks after transplant. it is delayed hypersensitivity reaction, and the chronic rejection is a rejection of transplanted tissue that can occur at a late time. Immune complexes form in the arteries supplying the graft, choking off the blood supply and the tissue is rejected.
Answer:
Here is your answer
Explanation:
The building blocks of Enzymes are Proteins which contains long chains of Amino acids linked by peptide bonds. This specific order of amino acids in proteins is encoded by the DNA sequence of the corresponding gene.
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Answer:
The answer is Homo Erectus.
Explanation:
There is evidence that the first hominid species that controlled fire and migrated was homo erectus which was about 400.000 years ago but it is not accurately known and can range between 200.000 and 1.7 million years.
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