The origins of which of the following cell types creates the least amount of ethical debate?
A. EG cells
B. EC cells
C. Hematopoietic stem cells
D. ES cells
C
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Which of the following is involved in B cell selection and tolerance?
A) clonal anergy B) clonal deletion C) clonal anergy and deletion D) allelic exclusion
The regulatory protein
A. binds to the promoter region of DNA. B. may inhibit or enhance transcription. C. may control translation of the operon. D. affects the activity of the DNA polymerase. E. binds to the promoter region of DNA AND affects the activity of the DNA polymerase.
Which is a type of lymphocyte that forms in the bone marrow but matures in the thymus gland?
A) lymphoma B) T cell C) B cell D) none of the above
Answer the following questions true (T) or false (F)
1. Food poisoning is often the result of ingesting microbial toxins, not the microbes themselves. 2. Water contamination refers only to the presence of excess or non-endemic microbes.