A vaccine usually contains
Correct answer: B. killed or weakened pathogens, or antigens taken from them
- A. ready made antibodies against the pathogen
- B. killed or weakened pathogens, or antigens taken from them
- C. antibiotics that kill the pathogen
- D. living virulent pathogens in a small dose
Explanation
The point of a vaccine is to present the antigen without causing the disease, so the organism is killed, attenuated, or replaced by one of its surface proteins or an mRNA coding for it. The immune system responds as though to a real infection and leaves memory cells behind. A preparation of ready made antibodies is an antiserum, which treats rather than prevents and gives no lasting protection.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
Practise Immunity
139 free Immunity MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Specific Defense Mechanism questions
The antibodies a newborn baby receives across the placenta and in its mother's milk provide
Vaccination against measles gives
The secondary immune response is faster and much stronger than the primary response because
In the primary immune response, detectable antibody appears only after
An antigen is best defined as
Rheumatoid arthritis and type 1 diabetes are classified as autoimmune diseases because in each of them