Tiana is viewing a sample under the microscope, and she describes what she sees as: "Small purple blobs, oval in shape, some look like a large oval connected to a small oval" Which specimen is she most likely viewing?
A) Budding yeast
B) Spirogyra
C) Amoeba
D) Aspergillus
A) Budding yeast
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Analysis of the 1918 and 2009 flu epidemics reveals that the most likely scenario was that ________
A) the virus causing these outbreaks were derived from a single strain within which significant mutations changed the protein hemagglutinin B) these viruses switched from using RNA to using DNA C) the virus ultimately arose in birds, jumped to pigs, and then was able to switch to humans D) strong selection produces particularly virulent flu strains with predictable periodicity
Why might the xiphoid process be missing from the sternum in a set of human remains?
a. The remains are from an adult younger than 40 years of age, and the hyaline cartilage does not preserve as well as bone. b. Because the xiphoid process may be broken off if the individual had been given CPR c. Because the xiphoid process shrinks with age d. Because the xiphoid process is small and does not articulate with any other bones
In the open ocean, ________.
A. Archaea are not present B. Archaea are only found in extreme environments such as near thermal vents C. the relative abundance of Archaea versus Bacteria decreases with depth D. the relative abundance of Archaea versus Bacteria increases with depth
In replication, once the DNA strands have been separated, reformation of the double helix is preventedby:a
DNA helicase enzyme. b. single-strand binding proteins. c. DNA polymerases. d. ATP. e. GTP.