Ocr gateway additonal science b3 c3 p3

Hey guys. In this thread you can ask about this upcoming GCSE examination. You can ask questions and also respond to questions. :smile:

(edited 8 years ago)

Reply 1

Abirella

Can anyone explain how mitosis works?

Reply 2

boredom07

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.

Reply 3

ouatislifex

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.

Reply 4

sarahjoireman

does anyone have any predictions for tomorrows exam?

Reply 5

Abirella

How did everyone find the exam today? Can we discuss our answers? :smile:

Reply 6

stormyy

Original post by Abirella

How did everyone find the exam today? Can we discuss our answers? :smile:

what did you get for the atom economy and riyas power?

Reply 7

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

Reply 8

Abirella

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