At what point during development does the embryo form three germ layers?
A. when the nervous system develops
B. when it forms the inner cell mass
C. when it becomes recognizable as human
D. when it begins cleavage
E. when it forms the gastrula
Answer: E
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In the Olestra potato chip experiment, the
result was
a. Olestra potato chips cause cramping. b. potato chips without Olestra cause cramping. c. there was no evidence that Olestra caused cramping. d. watching movies cause cramping. e. people should not eat potato chips.
Which bacterial groups typically colonize the newborn within the first 12 hours of birth?
What will be an ideal response?
Which method may effectively prevent the spread of botulism?
A) Do not eat food that has been sitting at room temperature for hours. B) Avoid contact with infected individuals who are regularly sneezing. C) Thoroughly boil or cook all food products. D) Thoroughly wash hands before eating any food.
In frogs, formation of the eye lens is induced by chemical signals from
A) cells that will become the neural plate. B) cells that are forming the inner ear. C) an outgrowth of the developing brain. D) both A and B E) both A and C