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ACT Science 1.3 Conflicting Viewpoint Passage 215 Views
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Description:
ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 3. Which of the following reasons would Scientist 2 give to explain why auxin is unlikely to be responsible for this patterning?
Transcript
- 00:03
We put the weird in weird science...
- 00:06
Did you miss this passage? We know you did.
- 00:08
You can hit pause and spend some quality time with it.
- 00:17
Scientists discovered that a special protein, called PIN1, is found in cells adjacent to
- 00:23
the SAM. PIN1 is always found nearby any cells that contain large amounts of auxin.
Full Transcript
- 00:29
Which of the following reasons would Scientist 2 give to explain why auxin is unlikely to
- 00:35
be responsible for this patterning?
- 00:37
And here are the potential answers...
- 00:41
So what's this question asking?
- 00:42
Well, it's asking us how Scientist 2 would show that auxins
- 00:46
are NOT responsible for PIN1 patterning.
- 00:49
Scientist 2 opens up by saying how much he doesn't like the auxin hypothesis.
- 00:54
He says...
- 00:55
"The problem with the auxin hypothesis is that auxin signals like a traffic signal:
- 01:01
it tells the cells when to grow and create leaves, but it doesn't tell them where to grow".
- 01:06
Which option matches the reasoning in this statement?
- 01:09
Well, option A is just not true, for starters.
- 01:12
We know that auxin is present in the SAM because auxin allows the shoots...
- 01:16
... the S part of SAM...to grow.
- 01:19
What about B?
- 01:20
"Auxin isn't involved in PIN1 clustering."
- 01:22
Yes, well...this may or may not be true, but it's missing something.
- 01:26
B is the conclusion, but it doesn't have the reasoning to go with it.
- 01:30
Option C.
- 01:31
"Auxin isn't directional, so it is difficult to see how it would cause PIN1 to cluster."
- 01:37
Yes! This matches what Scientist 2 said about auxin not helping with directions.
- 01:42
If auxin doesn't have the ability to tell the PIN1 where to grow, then it can't be responsible
- 01:47
for the specific growing patterns of PIN1.
- 01:50
C's our answer.
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