OCR as biology 25th may 2017 Watch
not good i suppose
no joke i procastinate so much
u know how long and how i revised
in the last 1 hour 12:15pm started revision
and how i revised
i got the revision guide and just flicked through pages glancing at them for a matter of seconds
and i have done this for all my exams
got chemistry tomorrow might just do same thing
The last question was a 3 marker on Meselson and Stahl's experiment. Something like 'Using the image above (a picture of 4 test tubes containing centrifuged DNA from different generations of bacteria), explain how Meselson and Stahl's experiment supported the idea of semi-conservative DNA replication.' It was the one where bacteria were placed in a lighter isotope of Nitrogen and left to replicate.
What did you guys write for that mammals needed glycogen and not glucose? and for the T test what value's did you guys get ?
I wrote that because glycogen is insoluble, it won't get involved in any chemical reactions inside the liver cells as glucose would. The t-Test value was 3.83.
God that's a tricky question to explain. I put that with each new generation (and therefore each new DNA replication) there were more light DNA molecules made. Since there were still heavy DNA molecules as well, it shows that in each new DNA molecule 1 of the 2 strands must have come from the old DNA molecule. Pretty sure I won't get full marks on that one.