Answer:
Explanation:
This is because sickle cell disease is common in malaria dorminated area because their traits confers resistance to malaria. The red blood cells, which contain abnormal hemoglobin become sickle in shape after it has been affected by malaria parasite. Therefore, most American that have African ancestry are at high risk of
the disease because the African ancestry are carriers if this gene and are inherited by the Americans.
Answer:
CD4 on the surface of helper T-cells.
Explanation:
MHC class II ( major histocompatibility complex) molecules are processed from the exogenous source. The presentation of antigen on cells are important for the adaptive immune response.
MHC class II interact with CD 4 present on the surface of T helper cells. This interaction is important for the generation of an immune response. Helper T cells can release cytokines and can perform phagocytosis.
Thus, the correct answer is option (C).
I don’t know the first two but the last one the thousands of subunits are called nucleotides
How the industrial revolution raised the quality of life for workers and their families
Sections.
- An Increase in Real Wages.
- Technological unemployment and underemployment.
- Pollution and Urban Conditions.
- Capitalism and “the spirit of the age”
Explanation: say thanks to google
Pretty sure it's D, hope I helped
