Diseases constantly present in a population are called
A. epidemic.
B. chronic.
C. latent.
D. endemic.
D
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Which mutation(s) may not result in an amino acid change in the protein product?
a. deletion and insertion b. deletion and substitution c. insertion and substitution d. substitution only e. insertion only
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The soil layer surrounding plant roots, called the rhizosphere, has been shown in some cases to _____
A) contain fungi that produce an endotoxin which inhibits the growth rhizomes B) inhibit the growth of fungal pathogens C) produce vitamins essential for the uptake of nitrogen D) contain archaea which produce antibiotics that prevent the growth of most bacteria
Some flowers have distinctive patterns that only reflect ultraviolet light and therefore are invisible to humans. Which statement about such markings is not correct?
A. Flowers with ultraviolet patterns usually appear yellow or orange to humans. B. Carotenoid pigments are responsible for the ultraviolet patterns. C. The ultraviolet patterns are highly visible and attractive to bees. D. The ultraviolet patterns repel birds and bats from the flowers. E. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites.