________, periodic reports on the susceptibility of clinically isolated organisms to the antibiotics in current local use, are particularly valuable for tracking the emergence of new antibiotic-resistant strains of pathogens
A) Antibiotic susceptibility plates
B) Antibiograms
C) Direct agglutination reports
D) Histograms
Answer: B
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A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely _____
A) cause increased flower production B) have no effect upon flowering C) inhibit flowering D) stimulate flowering E) convert florigen to the active form
In the Hershey-Chase experiment, bacterial viruses, called phage, were used to demonstrate that DNA is the genetic material. The phage that were used for this experiment consisted of DNA surrounded by a protein coat. Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell. To scientifically determine whether DNA is the genetic material, Hershey and Chase made phage in a medium containing radioactive sulfur-35 (S35 ). Why was S35 used in this experiment?
A. Only amino acids contain sulfur. B. Only nucleic acids contain sulfur. C. Both nucleic acids and amino acids contain sulfur. D. The radioactive sulfur labels peptide bonds.
Exposure to light _____ melatonin levels
a. raises c. does not affect b. lowers
Both the large waves and starvation of marine
mammals was caused by a. El Niño. b. El Diablo. c. El Minator. d. El Laborador. e. none of these