_______ are secreted by cells infected with viruses, alerting neighboring cells and protecting them from becoming infected.

Biology

1 answer:

hammer [34]3 years ago

5 0

Answer:

The correct answer will be option B (Interferons).

Explanation:

The innate immune response to viral infection begins with the recognition of pathogen which starts viral host response in organism.

After detection of viral infection cell produces type I interferon's, the protein molecule which interfere with the proliferation of viral cells.

Interferon's provide resistance to viral infection by :

1. Binding to IFN-α/β receptors which activate JAK/STAT pathway.

2. Production of enzymes which leads to the degradation of viral RNA.

3. Induction of ds-RNA-dependent kinase which inactivates the synthesis of proteins.

4. Binding to Natural killer cells which induces lytic activity, killing viral infected cells.

Thus, option B-interferon is the correct answer.

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The female (XcX) is carrier for color blindness while the male (XY) is normal. The carrier female transmits its one X chromosome with gene for color blindness to one of her sons making him color blind.

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Since both the parents are normal, the mother (XcX) should be carrier for the disease to get the color blind son. A cross between carrier mother (XcX) and normal father (XY) would make 50% of their sons color blind.