Cell surface markers involved in immune reactions
A. participate in communication with other cells of the system.
B. are the result of genetic expression.
C. function in recognition of self molecules.
D. aid in cellular development.
E. All of these choices are correct.
Answer: E
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E. coli strains toxic to humans live in the
intestine of ____ without sickening them. I. birds and frogs II. goats and sheep III. cattle and deer
a. I only b. I and II c. II and III d. I and III e. all of these
In eukaryotic cells, transcription cannot begin until
A. several transcription factors have bound to the promoter. B. the 5' caps are removed from the mRNA. C. DNA nucleases have isolated the transcription unit. D. the two DNA strands have completely separated and exposed the promoter. E. the DNA introns are removed from the template.
True or false: In addition to eliminating toxic compounds, the three-step waste elimination process also allows multicellular organisms to regulate the amount of water and solutes in their bodies
A. true B. false
Who discovered the first antimicrobial widely available to the general public?
A) Domagk B) Ehrlich C) Fleming D) Waksman E) Ehrlich and Waksman