When you need to find and read peer-reviewed journal articles, the best place to start is with the library's databases. These are tools that are made to locate articles. They will also connect you to the full text of articles that UCCS subscribes to so you won't hit a paywall if you are searching for articles from off-campus.
Biology is a very diverse field with many specialty areas, so there isn't one biology database that will be best for all research topics.
Here are some you may find useful depending on your topic:
Sometimes researchers upload their unpublished manuscripts to pre-print servers so that they can share early results and get feedback from their peers. They will also submit to journals, so many of these articles will undergo peer-review, be published, and appear in databases like the ones listed above.
But not all of them. If you look for articles on a pre-print server, just remember they haven't been peer-reviewed. If you find something interesting, look up the title in one of the databases above to see if the article was ever officially published.