Which type of molecule is ricin?
a. protein
b. lipid
c. nucleic acid
d. carbohydrate
e. mineral
ANSWER: a
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The process of making multiple copies of a gene by inserting it into a host genome and culturing the host is an example of _____
a. PCR b. STR analysis c. gene cloning d. whole-genome shotgun method
In the respiratory tract, ciliated cells constantly sweep mucus that contains trapped foreign matter
a. True b. False
One of the most common ways to get information out to a wide audience in the least amount of time regarding hot topics in science is by using
A) peer-reviewed journals. B) science magazines. C) the Discovery Channel on television. D) general interest news magazines or newspapers. E) books.
Why did the dinosaurs become extinct?
A. The pollen produced by the rise in flowering plants produced allergenic responses in dinosaurs and interfered with their ability to communicate with potential mates. B. Increasing carbon dioxide levels produced climates too hot for the incubation of their eggs. C. Cycads and other gymnosperms upon which herbivorous dinosaurs fed declined, and the dinosaurs were unable to digest the angiosperms that arose in their place. D. A meteorite or comet crashed into the Earth, causing smoke and ash that blocked the sun and caused death of the plants that were food for herbivorous dinosaurs. E. The changing climate caused the evolution of most dinosaur species into the existing bird, mammal, and reptile species that exist today.