Paragraph 1: Bacteria find their way to stuff they need; how?!
- - This is a pretty simple beginning. We are given a phenomena and then scientists ask how this can occur.
Paragraph 2: One clue = specific patterns of swimming correlated with attractants/harmful substances
- - Bacteria swim to the stuff they like
- Moving towards good stuff = less tumbling = straighter
- Moving away from good stuff = more tumbling = less straight
* Note: Most of this paragraph is heavily reliant on cause and effect relationships. "This will probably be asked in some inference question" may be what you are thinking here.
Paragraph 3: Two possible ways this occurs = front/back theory or interval theory
- * Note: I broke this paragraph into two paragraphs, splitting at 45. So now I have the first paragraph that discusses the two theories and the second paragraph that gives more information about the two theories. It just seemed easier for me to keep track of the information.
Paragraph 3.5: Expectations if one theory over another is valid
- - If interval theory + exposed to uniformly high concentration → straight runs
- If front/back theory + exposed to uniformly high concentration → no response
- Evidence suggests interval theory
Once again, in paragraph 3(.5), we see a bunch of conditional relationships! We are probably going to be asked questions about this. So I think the difficulty of this passage remains in the insane amount of cause-and-effect, interpreting all of this cause and effect under timed pressure will be (was) fairly difficult.
