A. none of the answers are correct
28. Which of the following statements are accurate?
A. none of the answers are correct
B. An effective humoral immune response typically requires both T cell and B cell activation.
C. T cells activation does not usually require antigen presentation by an antigen presenting cell.
D. Viruses can avoid activating the adaptive immune system if they do not change their surface antigens once they have been recognized by T and B cells.
E. People who were affected with the smallpox virus before cowpox virus were naturally immune to the smallpox virus because the viruses shared some common antigens and the memory cells that recognized cowpox antigens responded to smallpox antigens as well.
F. Helper T cells can kill cells that are infected with viruses and Cytotoxic T cells are known to activate B cells.
Answers: 1
Biology, 21.06.2019 18:50
Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide
Answers: 3
Biology, 22.06.2019 06:30
How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased
Answers: 2
Biology, 22.06.2019 14:30
Find the mass of the cone using the triple beam balance. a. 543.0 g b. 542.0 g c. 504.28 g d. 502.8 g select the best answer from the choices provided a b c d
Answers: 3
28. Which of the following statements are accurate?
A. none of the answers are correct
A. none of the answers are correct
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