An outbreak caused by a batch of bad potato salad at a picnic is called a________ outbreak
a. Point source
b. Common-source
c. Propagated
d. All of the above
Ans: a. Point source
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A common hypothesis and casual assumption is that dogs originated from wolves. Because of the wide range of body sizes and shapes, other hypotheses include dog ancestry of jackals, coyotes, dingoes, or other wild dog species. In recent years, several studies have been done to clear up the lineage. One study tested the Y chromosome DNA that can only be passed down from male to male, and the other other study tested the mitochondrial DNA because
A. the mitochondrial DNA records the inherited genetics of all the male and female parents of each generation. B. the mitochondrial DNA contains genes that could code for dog size. C. the mitochondrial DNA is only passed down through females to each new generation. D. the mitochondria perform cellular respiration, providing energy to speed up the DNA analysis. E. the mitochondrial DNA is much smaller, easier, and faster to analyze for the dog lineage.
The first successful outcome of gene therapy was in a case of a young girl suffering from
____________________ who was supplied with copies of the ADR gene. Fill in the blank(s) with the appropriate word(s).
Why do freshwater fish excrete a large amount of very dilute urine?
a. Because they live in a hypoosmotic solution, their cells take up excess water that must be excreted. b. Because they live in a hypoosmotic solution, their cells tend to accumulate a lot of solute that must be excreted. c. Because they live in a hyperosmotic solution, their cells take up an excess of water that must be excreted. d. Because they live in a hyperosmotic solution, their cells tend to accumulate a lot of solute that must be excreted. e. Because animals must live in an isoosmotic solution, they excrete solutes to make the concentration of solutes in the water equal to the concentration of solutes in their cells.
Most polyploid species arise from
A) a single diploid parent plant. B) a single triploid parent plant. C) a single tetraploid parent plant. D) the hybridization of two parent species.