Hello Everybody, I am new to this site. I have found some PhD studentships for Biological science type subjects that I would like to apply for but I have no idea of how to go about it. I have a good job CV but I assume this is going to be quite different. The deadline for my favorite one is one week away so I am a bit short on time to figure this out (panic). Can anyone offer me some advice?

IT's not a lot different for a PhD app. Just put your education first, rather than work experience. If you have any publications, previous scholarships, conferences etc then add these too. If have specific technical skills that they are asking for, then mention this as well.

FOr the covering letter, put why you want the PhD, the interpersonal and technical skills you can bring to it and why you would be a good candidate.

you can write cover letter in 4 para. 1st para: who are you and why are you writing, 2nd para: why do you want to work with them i.e. check their background and check your academic interest and amalgamate them, 3rd para: why they should select you i.e. display your academic and non-academic abilities, 4th para: summarise all of the above, and thank them for their time and consideration.
Do not go beyond 1 page for cover letter. be brief and to the point, do not replicate your complete CV here, rather just choose couple of things from CV and make them sound interesting on cover letter.