Which of the following viruses is recognized as the smallest in size, measuring roughly 20 nanometers in diameter?
Q1. Which of the following viruses is recognized as the smallest in size, measuring roughly 20 nanometers in diameter?
Answer: Parvovirus
Explanation: Parvoviruses are approximately 20nm, making them the smallest known viruses. Poxviruses are the largest at around 200-300nm.