Approximately how many species have we described out of the species alive today? We have described _____
A) almost all of the species on Earth.
B) about one-eighth of the species on Earth.
C) about one-quarter of the species on Earth.
D) about half of the species on Earth.
E) only a small fraction of the species on Earth.
Answer: E
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Which of the following statements is true?
a. Gene mutations occur independently of each other. b. Gene mutations are relatively rare. c. Ionizing radiation causes chromosomal damage and free radical formation. d. Mutations are random; that is, it is impossible to predict exactly when a specific gene will mutate, but an expected frequency can be assigned. e. All of these are true
The biological species concept is limited, and may not be applied to
A. asexually reproducing organisms. B. species that could possibly interbreed if they lived near one another. C. organisms known only in the fossil record. D. All of the answer choices are correct.
Moist heat requires higher temperatures and shorter times for sterilization than dry heat.
a. true b. false
Which of the following is false about quinolones?
A) They are synthetic antimicrobials that target cell-wall synthesis. B) The more modern and most commonly prescribed group of quinolones contain a fluorine atom. C) In rare instances, these drugs have been associated with more serious side effects such as nerve damage, tendonitis, and possible tendon rupture. D) They are excellent in situations where there isn't time to identify the responsible pathogen. E) They have a broad spectrum of action, can be taken orally, and have a relatively long half-life.