Question 1:

Which of the following is an example of a microbial pathogen?

Explanation: Streptococcus pneumoniae is an example of a microbial pathogen. It is a bacterium that can cause pneumonia and other infections in humans. Therefore, option C is correct.

Question 2:

Which of the following is a component of the innate immune system?

Explanation: Natural killer cells are a component of the innate immune system. They are responsible for recognizing and destroying infected cells. Therefore, option C is correct.

Question 3:

Which of the following is an example of an adaptive immune response?

Explanation: Antibody production is an example of an adaptive immune response. Antibodies are produced by B cells in response to specific pathogens. Therefore, option C is correct.

Question 4:

Which of the following is a mechanism used by pathogens to evade the immune system?

Explanation: Antibiotic resistance is a mechanism used by pathogens to evade the immune system. It allows the pathogens to survive and multiply in the presence of antibiotics. Therefore, option A is correct.

Question 5:

Which of the following is an example of a vaccine?

Explanation: The influenza vaccine is an example of a vaccine. Vaccines are used to stimulate an immune response and provide immunity against specific pathogens. Therefore, option C is correct.