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Regarding biochemistry: If you are given a question that is worth 3 or 4 marks you will need to go more indepth with this. Similar DNA sequences indicate a common origin, i.e. evolution. The more similar the DNA of two organisms, the more closely related they may be, as similar DNA means...

Beadle and Tatum were not wrong in their hypothesis or experiment. They were just essentially lucky that the production of arginine (a nutrient needed for growth) in bread mould is only controlled by one polypeptide, which is in turn controlled by one gene. Their theory had to be changed...

Quarantine is only effective as a PHYSICAL barrier to disease, e.g. isolation, destroying infected items. This is a disadvantage as many diseases, like avian influenza for example, can be spread by wild birds that naturally migrate over borders. It is exceedingly difficult stop this kind of...

Whenever the question says COMPARE, a table is the easiest way to go! Your headings would be, for at LEAST TWO vertebrates other than humans AND invertebrates: - name of organism - electromagnetic spectrum detected (e.g. humans detect visible light ROYGBV) - wavelength detected (e.g...

I think it would be a little higher than 85, because Biology is the "easy" science..

Yeah, I'm feeling pretty defeated. I tried so hard but I'll probably end up in the 50's. Bye bye E4 :(

I understand what you mean, I have what I like to call numeral dyslexia. It always happens to me in exams, and I just can't see what the number is actually supposed to be!:chainsaw:

Off the scale, I got beaten with the crap timetable stick this week: Today was maths x1, tomorrow is biology and japanese continuers, friday is english x1 ...arrrgghhhh

Cataracts typically result from aging, or are due to UV radiation - but all cataracts, no matter the cause, involve the clumping of oxidised crytalline proteins within the lens.