Spoilage of canned foods due to inadequate processing, NOT accompanied by gas production, is
A) thermophilic anaerobic spoilage.
B) flat sour spoilage.
C) spoilage by mesophilic bacteria.
D) caused by acid-tolerant fungi.
E) putrefactive anaerobic spoilage.
B
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Bacterial cells typically have ____ while eukaryotic cells have ____
a. a single circular chromosome; many linear chromosomes. b. several circular chromosomes; many linear chromosomes. c. one linear chromosome; many circular chromosomes. d. two circular chromosomes; numerous circular chromosomes depending on the species. e. numerous circular chromosomes depending on the species; many linear chromosomes.
Which trait does the fossil in the accompanying figure share with modern birds?
a. long, clawed fingers on each forelimb b. teeth c. Feathers d. long bony tail e. heavy jaw
Chlorosis, stunted growth with yellowing and death
of young leaves, is caused by a deficiency of a. nitrogen. b. zinc. c. magnesium. d. iron. e. any of these.
Male hummingbirds flash a patch of iridescent feathers on their neck called the gorget. This behavior makes them very visible. Why advertise their presence to a predator?
A. Hummingbirds are so fast that predation is not a large factor for them. B. This is an example of a maladaptive behavior that decreases overall fitness. C. The benefits of defending a territory exceed the costs of predation. D. Predators cannot see colors so are not alerted.