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Black Americans are, on the whole, about twice as likely as

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Black Americans are, on the whole, about twice as likely as [#permalink] New post 12 Apr 2005, 10:32
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Black Americans are, on the whole, about twice as likely as White Americans to develop high blood pressure. This likelihood also holds for westernized Black Africans when compared to White Africans.
Researchers have hypothesized that this predisposition in westernized Blacks may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt.
Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers’ hypothesis?
(A) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low.
(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.
(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.
(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines.
(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not.
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 [#permalink] New post 13 Apr 2005, 02:42
A for me.
The researchers seem to believe that Africans who were used to low salt environments developed genes that adapted to low salt intake. A seems to say that Africans who were used to high salt environments have genes that are adapted to high salt intake.
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Re: cr salt in diet [#permalink] New post 13 Apr 2005, 05:44
karun_aggarwal wrote:
Black Americans are, on the whole, about twice as likely as White Americans to develop high blood pressure. This likelihood also holds for westernized Black Africans when compared to White Africans.
Researchers have hypothesized that this predisposition in westernized Blacks may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt.
Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers’ hypothesis?
(A) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low.
(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.
(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.
(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines.
(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not.


A it is. I've remembered HongHu gave us an wonderful explanation.
Researchers hypothesized that because of the (1)genes that adapted to an environmental scarcity of salt and (2) western high-salt diets, westernized Black Africans are more likely to develop high blood pressure.

Try to support. That is, if no one of the two factors, westernized Black African will be no more likely to develop high blood pressure.
This is the pattern, if A, then B; if not A, then not B.

Choice A is the best choice. It said genes that adapted to an environment where salt is available, westernized Black African will not develop high blood pressure.
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 [#permalink] New post 13 Apr 2005, 06:24
Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers’ hypothesis?

(A) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low. => this stem clearly speaks about present-day, westernized Black Africans and confirms then if they are NOT adapted to an environmental scarcity of salt they will NOT develop high pressure
(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem. => doesnt speak of present-day, westernized Black Africans
(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption. => same as above
(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines. => same as above => speaks of africans that still live in africa
(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not. => wrong

A) is the only answer that deals with present-day, westernized Black Africans
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  [#permalink] 13 Apr 2005, 06:24
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