(C) Interferons $(IFNs)$ are a group of signaling proteins made and released by host cells in response to the presence of several viruses.They act as

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(C) Interferons $(IFNs)$ are a group of signaling proteins made and released by host cells in response to the presence of several viruses.They act as a communication signal between cells to trigger the protective defenses of the immune system that eradicate pathogens.Interferons are low molecular weight proteins that prevent further viral replication in neighboring healthy cells,thereby providing innate immunity against viral infections.

Class 12 Biology Human Health and Disease Immunity

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$A$ substance (low molecular weight protein) produced by host cells in response to viral infection that protects other cells against further viral infection is:

AIIMS 1982 All AIIMS

A
Phytotoxin
B
Antibody
C
Interferon
D
Hormone

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Chapter

Human Health and Disease

Subtopic

Immunity

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Which of the following statements is correct regarding antibodies?

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Match the type of immunity listed in Column-$I$ with the examples listed in Column-$II$. Choose the answer that gives the correct combination of alphabets of the two columns:
Column-$I$ (Types of immunity) Column-$II$ (Example)
$A$. Natural active $p$. Immunity developed by heredity
$B$. Artificial passive $q$. From mother to foetus through placenta
$C$. Artificial active $r$. Injection of antiserum to travellers
$D$. Natural passive $s$. Fighting infections naturally
$t$. Induced by vaccination

Column-$I$ (Types of immunity)	Column-$II$ (Example)
$A$. Natural active	$p$. Immunity developed by heredity
$B$. Artificial passive	$q$. From mother to foetus through placenta
$C$. Artificial active	$r$. Injection of antiserum to travellers
$D$. Natural passive	$s$. Fighting infections naturally
	$t$. Induced by vaccination