The way you are asking these question makes me think that you know little or nothing about these subjects. It that's the case, I would guess that you didn't just wake up with these questions in mind, and that you have an assignment. Assuming again that I am correct, I don't think we should be helping with your assignments as that undermines the learning process established by your instructor(s).

Separately, each question after the first two - it is yes to both of them - would take a lot of time to answer properly given your (lack of) background. Yet it is very easy to research all of them using available internet resources.

Hello geethus2009!

It appears that your post has been cross-posted to another site: https://bioinformatics.stackexchange.com/questions/13131/structure-prediction

This is typically not recommended as it runs the risk of annoying people in both communities.

Hello geethus2009!

We believe that this post does not fit the main topic of this site.

See Mensur's comment. You should read a couple of basic books/articles.

For this reason we have closed your question. This allows us to keep the site focused on the topics that the community can help with.

If you disagree please tell us why in a reply below, we'll be happy to talk about it.

Cheers!