Which of the following primary immunodeficiencies is the most common?

A.
Severe combined immunodeficiency

B.
Selective IgA deficiency

C.
Agammaglobulinemia

D.
Di George's syndrome


B

Biology & Microbiology

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As compared to the circulatory system of most fishes, the circulatory system of adult amphibians has the advantage of  

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To create transgenic mice, DNA is injected into

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a. for restarting replication. b. RNA-dependent DNA polymerases. c. for priming replication. d. DNA replicases. e. error-prone polymerases.

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