Mast cells play what key role in initiating an immune response? a. releasing histamines b. creating antigens c. clotting wounds d. creating antibodies

Option a

Explanation:

Mast cells play a vital in the inflammatory and immediate allergic reactions. These cells release inflammatory mediators such as histamines, cytokines and chemotactic factors.

These chemicals acts on the smooth muscles, mucous glands and the inflammatory cells.

Histamines are not only released when the body detects any antigen it is also released during the time of injury.

explanation:

the sequence of amino acids in a protein determines its function. the dna sequence of a gene determines the amino acid sequence of the resulting protein. thus, any changes in dna sequence can result in changes in protein function. this is called a mutation.