Test your knowledge with these top questions!
Dental floss is designed to clean which areas?
Plaque is a sticky film of bacteria, so floss removes more than food caught between teeth.
A dental floss holder removes the need to do what with loose floss?
The handle can help people who find loose floss hard to grip or control with their fingers.
Much early commercial dental floss was made from which natural fiber?
Dentist Levi Spear Parmly urged patients to clean between their teeth with silk thread in the early 1800s.
Why does some nylon dental floss have a wax coating?
Wax also helps hold nylon floss fibers together, which can reduce fraying during use.
Which ABO blood type is known as the "universal red blood cell donor"?
O-negative red blood cells lack A, B, and Rh surface antigens, allowing emergency transfusions to patients of any blood type.
Edward Jenner developed the first successful smallpox vaccine in 1796 using which related virus?
Jenner observed that milkmaids rarely caught smallpox after contracting mild cowpox, inspiring the world's first true vaccine.
Jonas Salk famously refused to patent his 1955 vaccine against which crippling viral disease?
When asked who owned the patent, Salk famously replied: "Well, the people, I would say. There is no patent. Could you patent the sun?"
What Y-shaped proteins does the immune system produce to target and neutralize specific pathogens?
Antibodies (immunoglobulins) bind specifically to antigens on bacteria and viruses, marking them for destruction by white blood cells.
Which triage color marks the most urgent patients?
Red tags prioritize immediate life-threatening cases.
Which misuse accelerates antibiotic resistance?
Colds are viral, so antibiotics offer no benefit but drive resistance.