To isolate anaerobic gram-positive organisms, which of the following media should be used?
a. Anaerobic blood agar
b. Cycloserine cefoxitin fructose agar (CCFA)
c. Laked kanamycin-vancomycin (LKV) blood agar
d. Anaerobic phenylethyl alcohol agar (PEA)
D
Anaerobic PEA is similar to aerobic PEA in that it is selective for gram-positive bacteria but in-hibits enteric gram-negative rods and swarming by some Clostridia.
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Receptors for ________ hormones are located on the plasma membrane and affect target cells by _________
A. amine; activating protein kinase enzymes B. steroid; activating protein kinase enzymes C. peptide; forming hormone-receptor complexes that activate or inhibit gene expression D. steroid; forming hormone-receptor complexes that activate or inhibit gene expression E. amine; forming hormone-receptor complexes that activate or inhibit gene expression
The worldwide total fertility rate changed from
__ children per woman to ___ children per woman.
a. 2.5...6.5 b. 6.5...2.5 c. 1.5...8.5 d. 8.5...1.5 e. 3.5...4.5
Which of these drugs has the most narrow-spectrum activity?
A. Cephalosporins B. Isoniazid C. Erythromycin D. Tetracycline E. Aminoglycosides
What proteins are bound to enhancers, forming a protein "bridge" that bends the DNA over the promoter to initiate transcription?
What will be an ideal response?