Boa constrictors on an island are an example of a(n)
A. organ.
B. ecosystem.
C. cell.
D. organism.
E. population.
Answer: E
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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. The ultraviolet patterns are highly visible and attractive to bees. B. Carotenoid pigments are responsible for the ultraviolet patterns. C. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites. D. The ultraviolet patterns repel birds and bats from the flowers. E. Flowers with ultraviolet patterns usually appear yellow or orange to humans.
A cloning vector often used to introduce a foreign gene into a bacterium is a(n) ________
a. DNA chip b. plasmid c. operon d. transgenic organism
Skin is able to prevent most microorganisms from entering the body by
A) producing alkaline secretions. B) having keratin in the uppermost layer. C) production of antibodies. D) the adhesion junction in the skin preventing bacteria from entering. E) releasing macrophages on the skin surface.
The usefulness of today's antibiotics has been diminished by:
A. The limited number of antibiotics available compared to the number of microbe B. The emergence of new antibiotic-resistant strains of bacteria C. The emergence of new strains of human tissue cells that are resistant D. Difficulties is production