ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Texas EOC Videos 540 videos
AP U.S. History 1.1 Period 5: 1848-1877. Which of the following groups would be most likely to support the idea of Manifest Destiny?
In the 1950s and 60s, people weren't just expressing their feelings toward the government—they were singing them, too. (Think Crosby, Stills, Nas...
Deal or no deal? FDR's New Deal provided hundreds of thousands of jobs in the public sector to bring the economy out of the Great Depression. It wa...
Stressing Out PIN1 Clustering 215 Views
Share It!
Description:
ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 5. What effect should mechanical stress have on PIN1 clustering?
Transcript
- 00:03
Try this shmoopy question on for size...
- 00:05
If you like this passage, hit pause.
- 00:07
It'll last longer.
- 00:14
If PIN1 clustering is important for the patterning
- 00:16
of leaves and plants, and stress is also important for patterning, what effect
Full Transcript
- 00:21
should mechanical stress have on PIN1 clustering?
- 00:24
And here are the potential answers...
- 00:35
This is a problem dealing with a lot of causes and effects.
- 00:38
It wants to know if we can determine...what causes what.
- 00:42
Let's take a look at what we know:
- 00:44
PIN1 is important for patterning.
- 00:47
Stress is important for patterning.
- 00:49
Can the scientists help us out?
- 00:51
Of course they can!
- 00:53
Scientist 2 says: "If we intentionally stress the SAM, we see that the leaves begin to take
- 00:58
on a pattern that is highly stress-dependent." So stress causes patterning.
- 01:05
Well, PIN1 is what makes patterning happen.
- 01:08
So if we stress the plant...i.e. injure it, patterns will occur...
- 01:12
...and to make the patterns occur, we need PIN1.
- 01:15
Which answer aligns with this idea?
- 01:18
Well, mechanical stress doesn't cause PIN1 to
- 01:21
run away to the roots of the plant, so D is wrong.
- 01:24
What about C?
- 01:25
"PIN1 should accumulate near the SAM regardless of stress."
- 01:29
There's something majorly wrong with this answer.
- 01:31
If we read the question carefully, it's asking us to
- 01:35
find the effect of mechanical stress on PIN1.
- 01:38
Option B. "PIN1 should be created by auxin."
- 01:41
Yeah, that's fine and dandy, but it doesn't answer our question about mechanical stress.
- 01:46
Which leaves us with A. Injuries, or stresses, do cause PIN1 to accumulate.
- 01:51
A's our answer.
- 01:52
If you need us, we'll be over here, squeezing this stress ball.
Related Videos
ACT Science: Research Summary Passage Drill 2, Problem 1. Why do you think that the filter paper will not remove the salt from the water?
ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 1. What statement would both scientists agree upon?
ACT Science: Data Representation Passage Drill 1, Problem 1. What do the statistics in Figure 1 suggest?
ACT Science: Data Representation Passage Drill 1, Problem 2. Which of the following is a variable in Figure 1, but not in Figure 2?
ACT Science Data Representation Passage: Drill 3, Problem 5. According to Figure 2, what birth date will be predicted for an individual actual...