Sixty-five questions, split the way the exam is: five per scheduled lecture hour, so the two three-hour lectures — Microbe-Human Interactions and Specific Immunity — carry fourteen each and together make up 43% of the paper, while each two-hour lecture carries nine or ten.
Which topics come up inside each lecture is set by what the lecturer actually spent time on, measured from the recordings: resistance dominates Lecture 2, water and food dominate Lecture 4, and antibodies and antigens dominate Lecture 6. Transmission is the best return on your time — three objectives carrying nine questions.
Answers reveal only after you choose. Your score and a breakdown by objective appear at the end, with a review of everything you missed.