Select the statement that most accurately reflects characteristics of fluoroquinolone drugs.
A. They exhibit low potency and must be used in very high concentrations to affect pathogens.
B. Levofloxacin is a third-generation fluoroquinolone used in cases of resistant bacterial infections.
C. They are narrow-spectrum antibiotics.
D. Nalidixic acid is a first-generation quinolone still commonly used in patients today.
B. Levofloxacin is a third-generation fluoroquinolone used in cases of resistant bacterial infections.
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Why is it not surprising that Staphylococci are the leading cause of wound infections?
A. This genus is readily present as a part of the normal microbiota on most people's skin, so it could easily enter wounds. B. Members of this genus are all particularly virulent and highly capable of causing numerous infections. C. Staphylococci cannot be eradicated from the skin due to multidrug resistance in most members of the genus. Drugs simply don't kill them. D. Staphylococci are capable of a higher degree of spontaneous mutation than most microbes. This makes them able to acquire antibiotic resistance very readily, making them hard to eliminate by pre-surgical antibacterial scrubs. As such, they commonly infect surgical wound sites.
In positional cloning, the inheritance of a disease in a pedigree was linked to the inheritance of
A. other diseases or conditions. B. a specific blood type. C. other genes whose loci were known. D. marker sequences produced by restriction enzymes. E. all of these.
Which of the following is an INCORRECT statement about restriction enzymes?
A) Most restriction enzymes are isolated from bacteria. B) Restriction enzymes usually recognize palindromic sequences. C) Restriction enzymes create phosphodiester bonds between pieces of DNA in a cloning experiment. D) Restriction enzymes can cut to create overlapping single-stranded ends of DNA. E) Restriction enzymes can cut to create blunt-ended pieces of DNA.
The fetus is extremely vulnerable to environmental factors that can cause birth defects during the
A. second trimester. B. third trimester. C. first trimester. D. 12th through 24th week of pregnancy