Which of the following antibiotics are used to treat fungal infections? 1. aminoglycosides 2. cephalosporins 3. griseofulvin 4. polyenes 5. bacitracin
A) 1, 2, and 3
B) 3 and 4
C) 3, 4, and 5
D) 4 and 5
E) All of these antibiotics are used to treat fungal infections.
B
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In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This maintains both forms in the population. This would be an example of
A. negative frequency-dependent selection. B. directional selection. C. disruptive selection. D. balancing selection. E. negative frequency-dependent selection and balancing selection are correct.
The technique used to make millions of identical copies of DNA from a small sample in a test tube is ________
Fill in the blank(s) with correct word
Refer to the accompanying figure. What is missing in the filament labeled as A?
a. septa b. nuclei c. spores d. hyphae e. mycelia
Lampreys and hagfishes:
a. are the only extant jawless vertebrates. b. are the only extant air-breathing fish. c. are more closely related to ray-finned fish than they are to cartilaginous fish. d. have lobed fins. e. first appeared within the last 50 million years.