Khan Academy is great! Also, Alison (it's a website) has some free courses as well.
Answer:
the food class in diagram 6 is fat or lipids
hope it helps
In eukaryotic cells the DNA can be found in the nucleus mainly. so DNA replication takes place in the nucleus during the S phase of the cell cycle.
Also in eukaryotic cells there are mitochondria and chloroplasts (plants) and these have circular DNA and they also get replicated (according to their own mechanism).
Prokaryotic cells don't contain a nucleus. They do not contain DNA in the cytoplasm and thus the DNA replication will take place here.
I really hope this helps!
Is a substance that speeds up a chemical reaction, but is not consumed by the reaction