Question

27. Sam was walking through an alley when he spotted a small lump next to the dumpster. When he examined the lump, he found that it was a newborn baby that was not breathing. He called “911” to report the incident. When the police arrived, they questioned Sam regarding whether the baby was alive when he found it. He said, “No.” The baby was autopsied to determine if it were alive or dead at birth. Which of the following results of the autopsy would prove that the baby was born dead and not alive? A. Discoloration of the lungs. B. Dissected lung(s) floats in water. C. Dissected lung(s) sinks in water. D. Lungs collapsed. E. Lungs inflated with fluid.

28. If one were to follow the path of a human erythrocyte starting from an artery that leads to the duodenum, the erythrocyte will most likely pass through ___ capillary beds before reaching the right ventricle of the heart. A. 1 B. 2 C. 3 D. 4 E. 5

45. A mother antelope and its child are galloping along the plains, when they encounter a group of hungry lions. If the two antelopes try to escape the lions together, there is a 75% chance that both will be consumed and eaten, and a 25% chance that both will escape alive. If, however, the mother sacrifices herself to the lions, she may be able to buy her baby additional time to escape. What is the minimum chance that the baby can have to escape from the lions following such a sacrifice such that the mother’s action will be evolutionarily favored? You may assume that the baby antelope, once escaped, will be guaranteed to survive into a reproducing adult, and that the mother antelope is at the beginning of reproductive age. A. 25% B. 33% C. 50% D. 66% E. 75%

48. Which ecosystem is the most unstable? A. African grassland B. Alpine tundra C. Belize tropical rain forest D. Saskatchewan wheat field E. Mojave desert

Please give explanations to the above 4 questions.

Answer 1

27) If the baby was born dead, it would not have taken in air during breath. Therefore, there will be no air in its lungs. So, the dissected lungs will sink. (option C).

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