A level Biology- I dont understand how to calculate this
A scientist determined the volume of a plant cell and the volume of organelles it contained.
They found:
• the volume of a plant cell is 17 500 µm3
• the volume of all the mitochondria in a plant cell is 262.5 µm3
• the volume of all the mitochondria and all the chloroplasts in a plant cell is 44.1% of the volume of a plant cell.
Use this information to calculate the volume of all the chloroplasts in a plant cell
They found:
• the volume of a plant cell is 17 500 µm3
• the volume of all the mitochondria in a plant cell is 262.5 µm3
• the volume of all the mitochondria and all the chloroplasts in a plant cell is 44.1% of the volume of a plant cell.
Use this information to calculate the volume of all the chloroplasts in a plant cell
Original post by Hena.S
A scientist determined the volume of a plant cell and the volume of organelles it contained.
They found:
• the volume of a plant cell is 17 500 µm3
• the volume of all the mitochondria in a plant cell is 262.5 µm3
• the volume of all the mitochondria and all the chloroplasts in a plant cell is 44.1% of the volume of a plant cell.
Use this information to calculate the volume of all the chloroplasts in a plant cell
They found:
• the volume of a plant cell is 17 500 µm3
• the volume of all the mitochondria in a plant cell is 262.5 µm3
• the volume of all the mitochondria and all the chloroplasts in a plant cell is 44.1% of the volume of a plant cell.
Use this information to calculate the volume of all the chloroplasts in a plant cell
Hey,
These are my workings:
total cell volume = 17500um3
mitochondria volume = 262.5um3
volume of mitochondria + chloroplasts = 44.1% of cell = 0.441 x 17500 = 7717.5um3
therefore
volume of chloroplasts = (mitochondria and chloroplasts vol) - (mitochondria vol) = 7717.5 - 262.5 = 7455um3
hope that helps! x
Original post by ks_xx
Hey,
These are my workings:
total cell volume = 17500um3
mitochondria volume = 262.5um3
volume of mitochondria + chloroplasts = 44.1% of cell = 0.441 x 17500 = 7717.5um3
therefore
volume of chloroplasts = (mitochondria and chloroplasts vol) - (mitochondria vol) = 7717.5 - 262.5 = 7455um3
hope that helps! x
These are my workings:
total cell volume = 17500um3
mitochondria volume = 262.5um3
volume of mitochondria + chloroplasts = 44.1% of cell = 0.441 x 17500 = 7717.5um3
therefore
volume of chloroplasts = (mitochondria and chloroplasts vol) - (mitochondria vol) = 7717.5 - 262.5 = 7455um3
hope that helps! x
Thank you so much.
I agree with the above:
Let x be the chloroplast volume:
x + 262.5 = 44.1% of 17500 = (0.441 * 17500) = 7717.5
Therefore by very simple transposition
x = 7717.5-262.5 = 7455
Therefore the chloroplast volume is 7455 microns cubed.
It’s not a difficult problem except, I think, the way they barrel words and notation at you.
In case it’s relevant to any one reading (I hope I am not talking down, we got this at school in Scotland so I am pretty sure you’ll know), um is actually μm, Greek lower case mu*, not lower case u, and stands for micrometer or micron, one millionth of a metre, about a twentieth of the thickness of a hair — “bacterial” scale.
* not just a show of Classical knowledge, rather a way of avoiding using mm twice. mμ is an old symbol for a millimicrometer, a nano metre, a billionth of a metre, so don’t mix ‘em up!
Let x be the chloroplast volume:
x + 262.5 = 44.1% of 17500 = (0.441 * 17500) = 7717.5
Therefore by very simple transposition
x = 7717.5-262.5 = 7455
Therefore the chloroplast volume is 7455 microns cubed.
It’s not a difficult problem except, I think, the way they barrel words and notation at you.
In case it’s relevant to any one reading (I hope I am not talking down, we got this at school in Scotland so I am pretty sure you’ll know), um is actually μm, Greek lower case mu*, not lower case u, and stands for micrometer or micron, one millionth of a metre, about a twentieth of the thickness of a hair — “bacterial” scale.
* not just a show of Classical knowledge, rather a way of avoiding using mm twice. mμ is an old symbol for a millimicrometer, a nano metre, a billionth of a metre, so don’t mix ‘em up!
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