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
Reply 1
Original post
by Hena.SA 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
Reply 2
Hena.S
OP
2
Original post
by ks_xxHey,
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.
Reply 3
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!
Quick Reply
Related discussions
- Aspiring pharmacist
- A Level Science with combined GCSE?
- studying for biology gcse
- how to improve on alevel biology math questions
- A Level choices - need help/advice!
- A level environmental science
- Studying at Pavol Jozef Šafárik University in Kosice, Slovakia
- Last GYG before GCSEs!
- Physics A level
- Im failing Alevel bio chem physics need help revision
- struggling with A levels
- Hi
- Trying to improve in Bio IGCSE Edexcel
- Help with question AQA a level bio
- Chemical engineering- A Level Options?
- A-level: AQA Physics, or Edexcel Further Maths
- A level chemistry
- chemistry aqa a-level question help
- Biology A Level
- How do i actually keep the content in my brain
Latest
Trending
How The Student Room is moderated
To keep The Student Room safe for everyone, we moderate posts that are added to the site.
