QUESTION TYPE: Strengthen
CONCLUSION: Phenazines bring nutrients to bacteria in the interior of the colony.
REASONING: No evidence is given for the hypothesis.
ANALYSIS: To answer this, you must imagine a colony of bacteria. The question says “interior bacteria”. So presumably some parts of the colony are in touch with the outside environment, and some aren’t.
The right answer is creative. I couldn’t have prephrased it. But I saw it supported the idea that interior bacteria couldn’t get nutrients without phenazines.
- CORRECT. Think about it. If interior bacteria need phenazines for nutrients, what will happen without phenazines? The interior bacteria will suffer. So this wrinkled shape is a response. It puts more interior bacteria in direct contact with the outside.
If phenazines are present, then it seems wrinkling is not required, because the phenazines send nutrients directly inside.
- This answer has nothing to do with nutrients.
- This is a false comparison. We don’t know what happens to colonies in nutrient-poor soil. The answers implies that they will grow less quickly without phenazines, but that’s not something we can assume – we need a direct comparison.
- This answer is about how well bacteria can fend off other bacteria. The hypothesis was about phenazines and interior nutrition, not about how phenazines help fend off other bacteria.
- This doesn’t help the argument. The hypothesis is that phenazines help interior bacteria! It’s not useful to learn that interior bacteria die faster than outer bacteria.
(Technically, this is a false comparison. It’s useless information. We don’t know if interior bacteria are also more likely to die without phenazines.)
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