What is the name of the chamber located in your throat that is an intersection of the pathways for swallowing and breathing?
Ans: Pharynx
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What is a trace fossil?
A. a small fossil B. fossil evidence of organisms other than conventional fossils of hard body parts C. a fossil which is part of a series of fossils that trace the evolution of a group of species D. a fossil that allows scientists to trace the movement of the fossilized organism
The most important vector of Lyme disease in the eastern United States is
A. Dermacentor virabilis. B. Dermacentor andersoni. C. Staphylococcus aureus. D. Ixodes scapularis.
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.
Polymerase chain reaction (PCR) is useful for amplifying a small piece of DNA but is not a good technique for cloning genes because
A) DNA ligase cannot be used in PCRs. B) PCRs do not generate palindromic sequences. C) copies of DNA produced by PCRs lack the regulatory genes and proteins required to activate genes. D) PCRs only generate primary transcripts that require excision of introns. E) ribosomes are required to produce active genes.