The Department of Biochemistry is part of the Faculty of Science and as such, offers programs leading to the degree of BSc.
You will find information on the Applying to McGill site.
You can fill out your Undergraduate Application form online and pay by credit card. If you cannot pay by credit card, you may request a paper application form by contacting the admission office. A non-refundable application fee of $100 in Canadian funds is required for up to two program choices.
To find out what the deadlines are, visit McGill's Undergraduate Admissions Guide, and scroll down to "deadlines"