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: Understanding primary vs. secondary immune response.
- Primary response: slower, longer lag phase, lower affinity antibodies (mainly IgM).
- Secondary response: rapid, short or no lag phase, high affinity antibodies (mainly IgG).
Step 2: Eliminating incorrect options.
- IgG is characteristic of secondary response.
- High affinity antibodies are produced in secondary response.
- Short/no lag phase is also typical of secondary response.
Thus, “Low affinity antibodies” is not a characteristic.
Final Answer: \[ \boxed{\text{Low affinity antibodies}} \]