OBJECTIVE LIFE SCIENCE
SIGNALLING IMMUNOLOGY CANCER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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First-line defences that mammals have against invasion by disease-causing bacteria include
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lysozymes.
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interferons.
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antibodies.
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cytotoxic T cell.
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Explanation:
Detailed explanation-1: -Physical barriers, including the skin and mucosa of the digestive and respiratory tracts, help eliminate pathogens and prevent tissue and/or blood infections. Moreover, components that are secreted by the skin or mucosa, such as sweat, saliva, tears, mucous, help provide a basic barrier against invading pathogens.
Detailed explanation-2: -Lysozyme is part of the first line of defense in the innate immune system and cleaves linkages between N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) in bacterial peptidoglycan. Additionally, fluids containing immunoglobulins and phagocytic cells are produced in the gingival spaces.
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