Autoimmunity is a(n):
a. automatic response to an antigen.
b. failure of self cell recognition.
c. reaction to environmental antigens.
d. normal response to infection.
e. response between the autonomic nervous system and the immune system.
b
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A site of negative genetic regulation where binding by repressor blocks transcription is the
A. operon. B. repressor. C. promoter. D. operator. E. CAP.
Restriction endonucleases recognize specific sequences in the DNA
Indicate whether the statement is true or false
Cross-bridges form between _____ and _____ during muscular contraction.
A. actin, myosin B. actin, tropomyosin C. myosin, troponin D. myosin, tropomyosin E. troponin, calmodulin
Which gas is increasing in the atmosphere and
intensifying the greenhouse effect? a. carbon dioxide b. carbon monoxide c. ozone d. nitrogen e. oxygen