Which color pigment is produced by Pseudomonas aeruginosa
A. lemon yellow
B. red-orange
C. golden
D. blue-green
E. pale orange
Answer: D. blue-green
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Which one of the following characteristics of steroid hormones is not shared by nonsteroid hormones?
A. Hormones activate the transcription of particular genes in response to system requirements. B. Hormones bind to hormone receptors. C. Responsiveness to hormones can be cell- or tissue-specific. D. The hormone crosses the plasma membrane.
How are fleas transmitted between hosts?
A) via direct transmission B) via an intermediate vector C) through multiple hosts D) via water
A certain unicellular eukaryote has a siliceous (glasslike) shell and autotrophic nutrition. To which group does it belong?
A) dinoflagellate B) diatom C) gymnamoeba D) foraminiferan E) cellular slime mold
Why are fungi used to clean oil spills?
A. Fungi store the hydrocarbons in their large central vacuoles. B. Fungi use the hydrocarbons in oil instead of CO2 during photosynthesis. C. The chemicals in oil kill off the fungus's competitors. D. Fungi use the organic molecules in the oil as food.