#16 - Concept Reference, Must Be True

[Zarie Blackburn]

Complete Question Explanation

The correct answer choice is (B).

Answer choice (A):

Answer choice (B): This is the correct answer choice.

Answer choice (C):

Answer choice (D):

Answer choice (E):


This explanation is still in progress. Please post any questions below!

[lathlee]

Hi. I cannot find the data that would support as B as the correct final answer choice in the text. what am i missing

[Shannon Parker]

Hi. I cannot find the data that would support as B as the correct final answer choice in the text. what am i missing

Hi.

Lines 51-56 demonstrate that "B" is the correct answer choice; stating that when the bacteria simultaneously measures the concentration at the front and back, it will not respond to the jump in concentration because, although the concentration would be high, it would be uniform.

Hope this clears it up.

Shannon

[mmathew]

Hey,

I have the same question. Do we directly refer to the second mechanism because the conclusion states that it is true?

[James Finch]

Hi M,

Yes, the passage clearly states that the second mechanism (measuring attractant at different times) is the one supported by actual evidence. However, this question is giving us a counterfactual situation, where we use the information given in the passage about the first proposed mechanism (measuring attractant simultaneously) to come up with evidence that would support it. As Shannon noted, lines 51-56 tell us what this evidence would look like: the bacteria would not exhibit a response to a change in concentration, because the concentration would still be uniform.

Answer choice (B) spells this scenario out exactly: the bacteria do not respond to a change in attractant concentration, which would support the predictions made by the first proposed mechanism about simultaneous measurement of attractant.

Hope this helps!