Question

Which of the following is not a characteristic of a secondary immune response?

• A. IgG isotype
• B. Low affinity antibodies
• C. High affinity antibodies
• D. Short or no Lag phase

Hint:

Secondary immune response is faster, stronger, and produces high-affinity IgG antibodies.

Answer 1

The Correct Option is B

Step 1: Primary vs. Secondary Immune Response
- Primary: Slower, longer lag, lower affinity antibodies (mostly IgM).
- Secondary: Rapid, short/no lag, high affinity antibodies (mainly IgG).
Step 2: Eliminating Incorrect Options
- Secondary response is characterized by IgG.
- High affinity antibodies are from the secondary response.
- Short/no lag is also from the secondary response.
Therefore, "Low affinity antibodies" is incorrect.
Final Answer: \[ \boxed{\text{Low affinity antibodies}} \]