Paleobotanists often examine fossils of extinct plants and their seeds to determine the dominant biome of the area at the time when the fossil was formed. You were examining a seed that showed signs of being from grasses well-adapted to long periods without rain. The strata in which it was found showed no trees but many grasses and other plants with hard, drought-resistant seeds. Given what you know about the biomes, in which of the following would you expect to find this plant?
a. tropical wet forest
b. arctic tundra
c. savanna
d. boreal forest
c. savanna
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Acyclovir is used to treat infections caused by ________.
A. hepatitis C virus B. influenza A virus C. HIV D. herpes simplex virus E. respiratory syncytial virus
Given the structure below, please answer the following questions
Is the accompanying figure DNA or RNA? ________ Is the arrow closest to the 5' or 3' end? ________ Spleen diesterase is an enzyme that breaks the covalent bond that connects the phosphate to the 5' carbon. Assume that the dinucleotide is digested with spleen diesterase. To which base and to which carbon on the sugar is the phosphate now attached, A or T? A) DNA; 3' end; T, 5' B) DNA; 5' end; A, 5' C) RNA; 3' end; A, 3' D) RNA; 3' end; T, 3' E) DNA; 3' end; A, 3'
Undercooked shellfish contaminated with ________ can lead to foodborne illness
A) Toxoplasma gondii B) Campylobacter jejuni C) Listeria monocytogenes D) Yersinia enterocolitica E) Vibrio vulnificus
The ORC in S. cerevisiae
a. stands for "origin recognition complex." b. is associated with ARS elements throughout the cell cycle. c. is a complex of six proteins. d. is similar to DNA-binding complexes in multicellular eukaryotes. e. All of the above.