Ocr gateway additonal science b3 c3 p3

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Abirella
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Hey guys. In this thread you can ask about this upcoming GCSE examination. You can ask questions and also respond to questions.
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Abirella
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Can anyone explain how mitosis works?
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boredom07
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Its basically when a cell divides into two daughter cells. Firstly the DNA replicates inside a cell. This cell then divides into two daughter cells with DNA in both of them so they are both genetically identical with identical chromosomes.
Asexual reproduction occurs via mitosis when amoeba reproduces, for example.
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ouatislifex
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(Original post by Abirella)
Can anyone explain how mitosis works?
Mitosis is when a cell reproduces itself by splitting to form two identical offspring.

Firstly, the DNA is replicated. Then the DNA coils into double-armed chromosomes. These arms are exact copies of each other and they contain exactly the same DNA. The chromosomes line up at the centre of the cell, and then divide as cell fibres pull them apart. The two arms of each chromosome go to opposite poles of one cell. Membranes form around each of these two different sets of chromosomes. The cytoplasm divides and you get two new cells containing exactly the same genetic material.
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sarahjoireman
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does anyone have any predictions for tomorrows exam?
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Abirella
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How did everyone find the exam today? Can we discuss our answers?
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stormyy
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(Original post by Abirella)
How did everyone find the exam today? Can we discuss our answers?
what did you get for the atom economy and riyas power?
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adamk110
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for the atom economy got 84.1% for the power cant remember it too well but I used the formula to work out work done and then divided it by the 2 minutes to get the answer for power
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Abirella
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(Original post by adamk110)
for the atom economy got 84.1% for the power cant remember it too well but I used the formula to work out work done and then divided it by the 2 minutes to get the answer for power
Oh how did you calculate the atom economy?
Did you add the numbers in the table together first?
And then divided it by how many there were and then times it by 100?
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adamk110
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(Original post by Abirella)
Oh how did you calculate the atom economy?
Did you add the numbers in the table together first?
And then divided it by how many there were and then times it by 100?
cannot really remember the Q now ... How did you answer the Q? Did you get a different answer?
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Abirella
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(Original post by adamk110)
cannot really remember the Q now ... How did you answer the Q? Did you get a different answer?
LOL have also forgotton
Tomorrow is B4 P4 and C4 are you ready for it?
I am cramming..
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