In the famous Spemann-Mangold experiment, what detail was crucial to understanding the result? 

A. transplanting the new dorsal lip cells to the same dorsal lip location in the second embryo
B. using genetically different donor and host frogs
C. placing the dorsal lip cells deep inside the archenteron
D. treating the dorsal lip cells with morphogens before transplanting them


B. using genetically different donor and host frogs

Biology & Microbiology

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An example of artificial passive immunity would be

A. chickenpox infection, followed by lifelong immunity. B. chickenpox vaccine triggering extended immunity to chickenpox. C. giving a person immune serum globulins to chickenpox virus after exposure to the disease. D. a fetus acquiring maternal IgG to the chickenpox virus across the placenta.

Biology & Microbiology

The evolutionary phenomenon known as reinforcement is most likely to occur when which of the following already exists?

a. A geographical barrier that separates two populations of the same species b. Prezygotic isolation between two different species c. Postzygotic isolation between two different species d. Gene flow between two separate populations of the same species

Biology & Microbiology

The use of the Indian mongoose to control rat populations ________

A) shows the effectiveness of biological control B) shows why integrated pest management usually fails C) became a disaster when the mongoose turned out to be as invasive as its target D) is an example of how coevolution makes biological control difficult

Biology & Microbiology

Which organ is not part of the digestive system?

Select one: a. kidneys b. mouth c. esophagus d. large intestine e. pancreas

Biology & Microbiology