Sulfate reduction in marine sediments is typically ________-limited
a. oxygen
b. light
c. nitrogen
d. carbon
Answer: D
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Which of the following is not a function of the general transcription factor, TFIIH?
A. unwinding of the DNA near the transcriptional start site B. recruits nucleotide excision repair proteins to the site of a DNA lesion C. direct interaction with RNA polymerase II D. recruitment of TFIID to the promoter E. formation of the closed complex
Rank the following chemical bonds from weakest to strongest:
a. hydrogen, ionic, covalent b. hydrogen, covalent, ionic c. ionic, hydrogen, covalent d. ionic, covalent, hydrogen e. covalent, ionic, hydrogen
What percentage of sodium in the blood is filetered and returned to the body by the kidney?
A) 90% B) 99% C) 80% D) 50%
All of the following are involved in the generation of an allergic response EXCEPT which one?
A) allergen B) IgE C) IgG D) mast cells and basophils E) histamine