Which of the following statements is correct?
A)From an evolutionary perspective,the adaptive immune system is older than the innate immune system.
B)Viruses contain a cell wall composed of B-glucans.
C)Phagocytic cells secrete cytotoxic compounds and initiate apoptosis.
D)Once animals detect pathogen-associated molecular patterns,an immune response is initiated.

Question

Quizplus · Accepted Answer

Once animals detect pathogen-associated molecular patterns (PAMPs), which are unique molecules found on pathogens, it triggers the initiation of an immune response. This is known as the innate immune response, which is the first line of defense against pathogens. The adaptive immune system, which is older in terms of evolution, is activated later and provides a more specific and targeted response to pathogens.

A) Incorrect because the innate immune system is older than the adaptive immune system. 
B) Incorrect because viruses do not contain cell walls. 
C) Incorrect because phagocytic cells do not secrete cytotoxic compounds or initiate apoptosis. They engulf and digest pathogens through a process called phagocytosis.

Which of the Following Statements Is Correct