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frez [133]
2 years ago
11

21. Cells of the immune system are able to respond to the presence of

Biology
1 answer:
ratelena [41]2 years ago
8 0

Answer:

1.  antigens present on the invaders

Explanation:

Through the antigens present to the invaders the Cells of the immune system can easily able to respond and recognize.  During an infection, chemical signals attract phagocytes to places where the pathogen has invaded the body. 

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A DNA binding repressor works by blocking the attachment of RNA polymerase an enzyme that enhance transcription to the promoter, thus preventing genes from been transcribed into messenger RNA.

An RNA binding repressor binds to the messenger RNA and prevents translation of the bases on the messenger RNA into protein. The blocking of expression is called repression.

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