Nuclear transfer is a preferred method of cloning over embryo splitting because it ____
a. is less technical
b. is more natural
c. results in a larger number of cloned offspring
d. produces both male and female offspring from the same clone
e. uses haploid nuclei
c
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A three-hectare lake in the American Midwest suddenly has succumbed to an algal bloom. What is the likely cause of eutrophication in freshwater ecosystems, such as this one?
A) increased solar radiation B) introduction of non-native tertiary consumer fish C) nutrient runoff D) accidental introduction of a prolific culture of algae E) iron dust blowing into the lake
The biological species concept is primarily based on ____ criteria
a. phylogenetic b. morphological c. genetic d. reproductive e. anatomical
Hepatitis B infection
A. has an incubation of 2 to 3 weeks. B. is responsible for most cases of post-transfusion hepatitis. C. can be transmitted by the fecal-oral route. D. increases risk for hepatocellular cancer.
Antibodies present in mom's milk primarily belong to the _______ class.
A. IgG B. IgM C. IgA D. IgE