@@ju1ian80 yo, the answer options are in DNA, but the table is for mRNA. So you need to convert the DNA into mRNA. CAA is in DNA form. The mRNA version of CAA is GUU (remember T replaced by U). And checking the table, GUU does code for Val. Do the same thing with CGA and u get the answer.
Yep that’s true. But this is the only codon that codes for alanine as GUC still codes for valine. How weird. This looks like a question error. Goood spot!
the question is about a base substitution in DNA, so the second and third options should be crossed off/they are not the right answer as they contain uracil. @@MrMurrayBiology
@@MrMurrayBiologythe answer for 5.5 is actually CAA --> CGA because the table shows what amino acids the mRNA codons code for but the question is asking about a mutation in DNA, so you have to convert the amino acid codons from mRNA to DNA :)
This was supppper helpful thanks!!
Are u planning on doing a paper 2 runthrough vid at some point?
for question 5.5 it should be CAA to CGA since its DNA not mRNA hope you see this!
real
@@howietzerhbut neither CAA or CGA codes for Val or Ala. they code for Gln and Arg. I don’t get it :(
@@ju1ian80 yo, the answer options are in DNA, but the table is for mRNA. So you need to convert the DNA into mRNA.
CAA is in DNA form. The mRNA version of CAA is GUU (remember T replaced by U). And checking the table, GUU does code for Val. Do the same thing with CGA and u get the answer.
@@howietzerh thank you so much, lifesaver. I need to read the questions more carefully hahaha
If you see this you should go through this even if you do OCR. I feel like some of this question might come up
Appreciate you
Prediction for paper 2 aqa a level biology plz
He’s my teacher Yall go away
but for question 5.4, GUU to GCA would not be a ‘single base’ mutation ?
Yep that’s true. But this is the only codon that codes for alanine as GUC still codes for valine. How weird. This looks like a question error. Goood spot!
the question is about a base substitution in DNA, so the second and third options should be crossed off/they are not the right answer as they contain uracil. @@MrMurrayBiology
@@MrMurrayBiologythe answer for 5.5 is actually CAA --> CGA because the table shows what amino acids the mRNA codons code for but the question is asking about a mutation in DNA, so you have to convert the amino acid codons from mRNA to DNA :)
@@c.stohr14 good spot. thankyou for that!
THIS PAPER IS SO HARD WTH
IKRR
FOR Q2.2 why did you divide it by a further 7350 for A and 14700 for B
It’s asking for the rate PER mm^2
What’s the point of this video your just reading the mark scheme
shows his thought process and way of working out , if you watch the video Mohammed u will see he doesn't just read the mark scheme
Ungrateful, he’s the only one doing this and it’s mad useful