Land plants arose from a lineage of freshwater green algae in the phylum ____
a. Rhodophyta
b. Charophyta
c. Chlorarachniophyta
d. Phaeophyta
e. Chrysophyta
ANSWER: b
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Modern cells are thought to have arisen from ____
a. protocells b. pre-cells c. gas and dust clouds d. prokaryotic cells that predated protocells e. prokaryotic cells that predated pre-cells
The coccyx, a tiny tailbone found in humans, is believed to be a ________ structure
A) terminated B) vestigial C) rudimentary D) redundant
The founder effect can result in ______
A. Speciation B. Allele mutation C. Increased incidence of genetic abnormalities D. Inbreeding
Common colds are upper respiratory tract infections. Why are vaccinations against the common cold not practical?
A. Vaccinations do not work in the upper respiratory tract. B. There are so many different strains of viruses that cause colds it would be impossible to develop a vaccine against all of them. C. Colds are caused by viruses that cannot be prevented by vaccinations. D. Vaccines are very costly to develop. E. Vaccines would not work against the common cold because it is caused by a bacterial infection.