Cracking The SAT Premium

A In lines 25-34, the author states that women who had Alzheimer’s disease are less likely to
have male cells in their brains. This suggests that male cells may help protect women’s
brains from disorders like Alzheimer’s. This means that (A) is supported by the passage.
The author suggests that foreign cells may spark immune disorders in lines 16–18, but the
author does not state that cells may make women less likely to have immune disorders, so
(B) is incorrect. The author never mentions aggression or physical strength, so (C) is not
correct. The author does not state that women with male cells in their brains will live with
men for a long time, so (D) is not correct.

B Choice (A) contains information on immune disorders, which seems to support (B) from
question 47. However, this line is from a part of the passage that is discussing cells in
general, not male cells specifically. This means that (B) from question 47 is not correct, and
(A) can be eliminated. Choice (B) discusses the fact that dormant male cells were less
common in the brains of women who had Alzheimer’s disease, which would imply that
women with more of these cells would be less likely to have that disease. This supports
(A) from question 47. Choice (C) discusses the discovery of the dormant male cells, but
does not directly relate to any choice from question 47, so it can be eliminated. The same is
true of (D); it discusses how microchimerism occurs but does not relate directly to any
choice from question 47. The correct answer is (B).

D The author does not discuss disorders that cause people to avoid strangers, so (A) is
incorrect. The author does not discuss children’s ability to help their parents through
difficult times, so (B) is not correct. The author states that our bodies harbor cells from
other people in lines 36–37, but this does not mean that individuals are not unique in any
way, so (C) is not supported by the passage. The author states that our bodies contain cells
from other people, so the concept of total individuality, having only our own unique cells,
may not match the evidence of other people’s cells in our bodies. Therefore, (D) is
supported by the passage and the correct answer.

D The author does not discuss the mother’s genetic makeup or the theory that the mother’s
transmission of her genes constitutes cell exchange, so (A) is incorrect. The author does not
discuss siblings being present for each other’s illnesses, so (B) is incorrect. The author
references memory disorders (Alzheimer’s) but does not discuss siblings’ experience of
memory disorders, so (C) is not supported by the passage. The author states in lines 78–81
that cells from an older child may remain in the mother’s body and pass to the younger
sibling during the younger child’s gestation. Therefore, (D) is correct.

C Choice (A) explains the fact that a woman could not produce her own male cells. Since this
has nothing to do with non-twin siblings as were asked about in question 50, eliminate (A).
Choice (B) references Alzheimer’s disease, which may seem to relate to either (B) or (C)
from question 50. However, this choice also does not mention anything about non-twin
siblings, so eliminate it as well. Choice (C) does state that even non-twin siblings may
swap cells while developing separately within the same mother, which strongly supports
(D) from question 50. Choice (D) is concentrated on cell competition between grandmother
and child cells within a mother, but not between non-twin siblings. The answer is (C).