What member of the human intestinal microbiota occasionally causes life-threatening disease?
A) Escherichia coli O157:H7
B) Clostridium difficile
C) Salmonella enterica
D) Giardia intestinalis
E) Lactobacillus
B
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Which of the following is true about sinusitis caused by allergy?
A. Produces a clear, watery discharge B. Preceded by viral rhinitis C. Caused by Streptococcus pneumoniae D. Produces a greenish or yellowish mucous discharge E. Usually introduced by trauma
Which of the following is a product of alcoholic fermentation?
a. oxygen b. FADH 2 c. water d. ethanol
Adding acetyl groups to a histone regulates gene expression by allowing transcription to proceed by
a. increasing the pH of the cell. b. loosening the DNA wound around the histone. c. modifying the nucleotides of the promoter region of the DNA molecule. d. enhancing the activity of RNA polymerase. e. enhancing the development of a DNA-RNA hybrid.
There are many ways to prevent insomnia. Which is NOT recommended?
-stay active, regular activity helps promote a good night's sleep -check your medications to see if they contribute to insomnia -nap frequently to make up sleep debts -avoid or limit caffeine and alcohol, and don't use nicotine