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And then they're active for less than 12 hours. It receives signals and then coordinates activity based on that. You tend to think of things that would be, you know, like motor movement, like muscles, but they also control things like glands. And glands could be especially relevant here because glands might be the things that release or don't release hormones that might put the mice to sleep or wake them up. All right, so I think that's, we've taken a decent job of describing the role of each of those. "Based on an analysis of the data in figure two, "describe the activity pattern of mice "during the light and dark periods "of the L12, D12 cycle." Well, this was pretty straightforward. So you see everything shifting up every 24-hour period because they tend to be inactive for less than 12 hours. And then active for a little bit less than 12 hours. Glands that might release hormones related to sleep. When there was light, so they were inactive during light.
And every day we're also ending our activity at an earlier hour.
And there's a lot more, I guess you could say, sporadic activity going on. All right, let's see if we can answer the questions.
So it looks like on day one, the mice were inactive, not 12 hours, like we saw when we had 12 hours of light, but it looks like about 10 hours. So this is really just, you know, do we know what a photoreceptor, a brain, and a motor neuron, I guess as related to this test. Inactive during light, and then active during the dark. And "use data to support the researchers' claim." All right, well, we talked about this already.
And then from hour, I don't know, this is maybe hour nine or 10, to about hour, it looks like maybe hour 21, they were active. And then inactive, active, inactive, active, but it seems to be less than for 12 hours. It re-see (laughs), it receives, it receives signals. And then a motor neuron, well, these are neurons that would stimulate. I could've written the answer down below, but I think I could've squeezed this one in. So under DD, mice active and inactive for less than 24, or less than 12 hours each. And then we could say versus 12 hours inactivity under light, under, I could say, L12. So under continuous darkness, mice active and inactive for less than 12 hours each versus 12 hours inactivity under L12 and to 12 hours activity under D12 when it was dark for 12 hours.
"Researchers investigated the effect of light "on mouse behavior by using a running wheel "with a motion sensor to record activity "on actograms, as shown in figure one." All right, so let's think about what figure one is showing us.
We have a picture of a mouse here that seems to be inactive, definitely not on the running wheel, even eyes closed, maybe it's sleeping.And then here, a picture of a mouse that is on the running wheel, maybe running, with its eyes open.And then we see our actogram here and it describes, "Strategy for recording mouse activity data.Each row represents a 24-hour period and the dark horizontal lines represent activity on the running wheel, just like we saw before. So in the first 12 hours, the mouse are in conditions where there's light, and you can see for the most part, on day one, we detect no activity. On day three, we detect a little bit of activity, but for the most part, when it's light, we detect very little to no activity. So the mouse is active when it's dark and inactive when it is light, which is the opposite of most human beings, or frankly, well, definitely human beings, where we tend to be active in the light and inactive in the dark. After 14 days, so that was just with 12 hours of light, 12 hours of darkness. And their activity on the running wheel was reported as before. "The researchers claim that the genetically controlled "circadian rhythm in the mice does not follow "a 24-hour cycle. "After 14 days of L12, D12," so it's 12 hours of light, 12 hours darkness, "the mice were placed in continuous darkness." Capital D, capital D. "The activity data under DD," continuous darkness, "conditions are shown in figure three." All right, so this is interesting here. "Describe one difference between the daily pattern "of activity under L12, D12 conditions, "figure two, and under," continuous darkness, the DD conditions in figure three. The AP Biology test has a multiple-choice section (that also includes grid-in questions, so it’s not purely multiple choice) and a free-response section. The next AP Biology exam will take place on Monday, May 11, 2020, at 8 am.The first section on AP Bio consists of multiple-choice questions and a handful of grid-in questions."The nervous system plays a role in coordinating "the observed activity pattern of mice "in response to light-dark stimuli." Yes, that makes sense, of course. "Describe one role of each "of the following anatomical structures "in responding to light-dark stimuli." A photoreceptor in the retina of an eye. "The mice were exposed to daily periods "of 12 hours of light," with the capital L, "and 12 hours of dark," capital D. So that's 12 hours of light, 12 hours of darkness, "for 14 days, and their activity "was continuously monitored. "The activity data are shown in figure two." All right, so this is an actogram of mouse activity under L12, D12 conditions. There's a few gaps right over here, but for the most part, the mouse is active when it's dark. Less continuous, there's definitely more times where the activity periods is broken up by inactivity or the inactive periods is broken up by activity.