Finish Cell Drawing
Why is mtDNA more useful in identifying remains than nuclear DNA?
The other approach analyzes mitochondrial DNA, or mtDNA. Because mtDNA tends to survive long after nuclear DNA has disintegrated, this approach is useful in identifying the remains of persons who died long ago. It was used, for example, to identify the two crew members of Bomber 31 who have been identified and, more famously, to help identify Czar Nicholas II of Russia, who was killed along with his immediate family in 1918. This is also the technique scholars have turned to in order to assess how closely related extinct Neanderthals are to people today*. Also, there are more copies of mtDNA than nuclear DNA (200-2,000 mitochondria v.s. 1 nucleus). http://www.pbs.org/wgbh/nova/bomber/mtdna.html
During Drowning, wet or dry, what is happening to the cells in your body? Answer in your lab notebook.
(Hint: Where does the oxygen go?)
Notebook Check
CS Sketch Quiz Rubric
Homework: DUE 9/16
Is drowning in fresh water the same as drowning in salt water? For example, someone in a bathtub verses a surfer in the ocean. Explain your answer.
27 comments:
hi Ms. Marshall..
Drowning in salt water is the same as drowning in fesh water because either way your going to die the same. Even thogh salt water hurts your nose more! :)
Rebecca Malave 3rd period
I think the cell dehydrate in salt water because that is what salt does.-Alberto Rodriguez
O.K. You guys 3 down 93 more of you to go. Don't wait for a special invitation. Just saying hi doesn't count! You must respond to my question.
i think you would die faster in freshwater. because salt water is more dense than fresh so you would be able to float easier in salt water and less in fresh.
-Hansel Fernandes 3rd period.
drowning in salt water is not the same as drowning in freshwater because in salt water, you can die by taking in high amounts of salt before drowning, but in fresh water, you can only drown to death.
-Irineo Aguinaldo 4th Period
i think you can die from fresh water faster because when the water fills the persons lungs the water will cause the blood cells to explode
-Jenny Arcaina 6th period
Although you have the same chances of dying the same, I think that there is a difference between drowning in fresh water and drowning in salt water. I remember hearing/learning from someone that more people actually die in fresh water than salt water. Anyway, even if thats not true, I think that the difference is how the different liquids affect our lungs and our cells.
Jessica Balanban, 4th Period
i think that drowing either salt or fresh water is the same because it will both kill us. Freshwater will go inside your bloostream that will prevent us to get enough oxygen and Saltwater will fill up your lungs and will cause blood to go into your lungs.
-Hannah Bernardino, 6th Period
I think that when you drown,dry or wet. That the pressure of the water in your lungs, makes your blood cells expeand and explode.
I think it takes longer to drown in salt water because our body responds to different types of liquid better, although drowning in either type of water will eventually lead to someone's death. The only difference is time, and I think our body responds better to salt water and will prolong the death because our body... is composed of it? I think.. I don't know. But, yeah. Okay, bye, Mrs. Marshall!
OH and Cristina Lacson, 6th period! :)
i think drowing in salt water can cause a faster rate in death because when we swallow a lot of salt water its kind of drowing in are own body liquid since are body's liqid contains salt. Drowning in fresh water causes the heart to stop because of the lack of oxygen, so when are heart stops we become unconscious then i guess it leads to death.
Freshwater
In freshwater, the water filling a person's lungs can enter the bloodstream quickly causing blood cells to swell and burst. Also, the fluid filling the person's lungs will prevent the body from taking in enough air.
Saltwater
In a saltwater drowning, the lungs fill with salt water which draws blood out of the bloodstream and into the lungs. This liquid build up in the air sacs stops oxygen from reaching the blood. We all know we can't live without oxygen -so we die. In other words, in saltwater you basically drown in your own fluids.
Anjelo Agustin 3rd Period
I think its not the same, because as I've learned from my previous biology process salt helps water to get in, that being said makes drowning much faster compared to drowning in a bathtub,and who would drown in a tub?
I think that it really doesn't make any difference whether you die in salt water or fresh water, because you're going to end up dying anyway.
But maybe the salt in the salt water does something to your body, like what salt does to a slug, or something like that.
Cecily Lam, 4th period
It's not the same because the chemicals in the salt water will have different effects on the body than normal fresh water. In the end the person will die but the salt in the salt water will make the person die faster because of the chemicals.
This is Elvin Tapawan 6th period
No its not the same. Although they might die the same way, the effects of their death may be different. There's no way it can be the same, its two totaly different kinds of death. One in the ocean, and one sadly.. in your.. bathtub.. sucks. But its true, but someone dying in the ocean or bathtub are two totaly different things.
drowning in salt water is different because salt causes you to dehydrate faster causing you to die faster.
I think that drowning in salt and fresh water will end up in the same result, but I'm pretty sure the salt water will do something to your cells that the fresh water can't
hmm... I think that they are kinda different yet you will die the same way the difference is that salt water may have a higher density that fresh water so you might drown faster, plus the waves of the ocean current, unless its like a bath tub full of salt water.
Hi Ms. Marshall!
Nope! Drowning in Salt Water is not the same as drowning in Fresh Water. Don't people tend to float much better in salty water than in fresh water? I remember learning about buoyancy which is caused by the difference in density between the water and an object floating in it. Salty water is more dense than fresh water because there's stuff in it like rocks, salt and fishies! And usually people will float in salty water because of this buoyancy concept. But either way, if the person is drowning, they're drowning! Yiiikes!
-Sara 4th Period
The difference between drowning and salt water has to do with something with the salt in the salt water. I don't know exactly what, but it has to be something.
Its the same, cells still explode either way. Although dying in a bathtub is pretty lame, surfers ftw.
David Perez-Rios, 6th
ya. drowning in salt water and drowning in fresh water is the same because you still get water in your lungs and you cant breath.
*drea* is Andrea Ramirez from 6th period.
hi mrs.Marshall
i think that there's a difference between drowning in fresh water and in salt water, because our body doesn't respond the same to every liquid that fills our lungs.
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