DNA and chromosomes may seem like completely separate things. Well, they’re not. In fact, all chromosomes are individual DNA molecules coiled and twisted around, because DNA is huge. At least in eukaryotes it is. That’s one of the first differences between eukaryotes and prokaryotes in their DNA – prokaryotes have less DNA.
Eukaryotic DNA is stored within the nucleus of each cell (apart from cells without one, e.g. red blood cells). Because of its sheer size, it must be organised well. Proteins called histones help do just that:
The S phase in the cell cycle involves the replication of DNA in chromosomes. Checkpoints ensure that all DNA is copied accurately, and once all chromosomes have been duplicated, they must be properly attached to the cell spindle fibres that will separate them during mitosis into the two new cells.
OFF TOPIC : I just want to say that your website is brilliant, thank you!!
Thank you for making all the content btw!
Serena Kutty YouTube
Good topic notes and cool videos. I'll definitely recommend it to my students.
Seema Sehgal AQA Examiner and biology teacher on LinkedIn
I’ve struggled so much with feeling overwhelmed with biology revision, and I don’t know where to start. But your website is just what I need! It tells me all the information I need, and the knowledge I need to then build on, and it’s written in a way that soaks straight up into my brain!
Prettyhetty The Student Room
You're such a G. Helped me so much, finally found someone who breaks biology down into something I can understand!!!
Alex Contact Form