A scientist discovers a new virus affecting birds. After isolation, the virus is characterized as having single-strand RNA in an icosahedral capsid and an envelope. To which of the following virus families might this new virus belong?
A. Coronaviridae
B. Flaviviridae
C. Orthomyxoviridae
D. Picornaviridae
E. Reoviridae
Answer: B
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Restricted by water availability; 20 degrees to 30 degrees latitude; hot sunny days, cold nights; annuals; shrubs with long roots; succulents.
A. desert B. savanna C. taiga D. temperate grassland E. tropical rain forest
Osmoconforming sharks take in water, as needed, _____
A) by migrating to freshwater rivers to drink fresh water B) via osmosis, as their body cells are slightly hyperosmotic to seawater C) via active transport of water across the cells on their gills D) by water diffusion from seawater, which is hyperosmotic to the fluids in their cells E) by selective transport of water molecules across the wall of the gut
Can two different species that are members of the same clade have more than one common ancestor? Choose the MOST correct answer and explanation.
A. No. Because they are members of a clade, by definition they can have only one common ancestor. B. Maybe. Two species in the same clade can have more than one common ancestor only in cases where horizontal gene transfer from a third, previously unrelated, species has occurred. C. Maybe. If they are members of a paraphyletic clade, they can have more than one common ancestor. D. Yes. Although two species in the same clade have only one most recent common ancestor, they also have a number of older common ancestors that occurred earlier in their evolutionary history. E. Yes. Two species of the same clade always have eight common ancestors, matching the number of levels higher than species in the taxonomic hierarchy.
What are the predicted phenotypes of the male children from the union of a woman who is
heterozygous for hemophilia and a man who has normal blood clotting characteristics? (Use the Punnett square to verify your answer.) a. all normal b. 3 normal : 1 hemophilia c. 1 hemophilia : 1 normal d. 1 hemophilia : 3 normal e. all hemophiliacs