Yes you can have that. Create a category in your blog named 'News' where you can publish news articles.1. Is it possible to have one blog site with one section dedicated to news?
Google crawls and indexes such content but then I it may de-index it too because news content is always duplicate and fetched from top sources.2. Can Google index the news section quickly like a news websites?
It is your choice honestly, but if I were you, I would only add news as a one section in my site. The reason being that such content has very less chances to reach to the top and fetch organic traffic. I would want to supplement my site with other original content.3. Would you suggest having a different website for the news instead of a section on the existing website?
How will Google know if it is a news section? What should I do to have a quick index for a particular news section?Yes Google index the news section quickly like a news websites.