Answer to Question 1
Cells of the innate immune system (macrophages, monocytes, natural killer cells, and leukocytes) react with any antigen; they can thus react immediately. Innate immunity involves inflammation, interferon, natural killer cells, and complement. This initial innate immune response is quite often sufficient to eliminate the pathogen or reduce its numbers enough to prevent initiation of a disease process. This type of immune response does not increase or improve with repeated exposures.
Answer to Question 2
d
Cellular locations of pattern recognition molecules of the innate immune system
Growth response by grasses grazed by wildebeest
Cancer Survival Rates According to Psychological Response to Diagnosis
Cell-mediated immunity, primary and secondary response.
Replication fork regression as a likely response to a blocking DNA lesion
Experiments showing that long- or short-day plants flower in response to night length. Each horizont