What is the primary difference between innate (natural) immunity and acquired (adaptive) immunity?

• A. Innate immunity is present at birth and provides a non-specific response, while acquired immunity develops over time and provides a specific response.
• B. Innate immunity provides a specific response to pathogens, while acquired immunity provides a non-specific response.
• C. Innate immunity requires previous exposure to pathogens, while acquired immunity does not.
• D. Innate immunity involves the production of antibodies, while acquired immunity does not.

Answer: (A)

Verified step by step guidance

1. Understand the definitions: Innate immunity is the body's first line of defense, present from birth, and provides a non-specific response to pathogens. Acquired immunity, also known as adaptive immunity, develops over time and provides a specific response to pathogens.
2. Identify the characteristics of innate immunity: It is non-specific, meaning it does not target specific pathogens. It includes physical barriers like skin, chemical barriers like stomach acid, and cells like phagocytes.
3. Identify the characteristics of acquired immunity: It is specific, meaning it targets specific pathogens. It involves the production of antibodies and the activation of lymphocytes (B cells and T cells) after exposure to a specific pathogen.
4. Compare the two types of immunity: Innate immunity is always present and ready to respond immediately to infections, while acquired immunity takes time to develop after exposure to a pathogen but provides a targeted and more effective response.
5. Clarify misconceptions: Innate immunity does not require previous exposure to pathogens and does not involve the production of antibodies, whereas acquired immunity does require exposure and involves antibody production.