EVERYDAY SCIENCE

Detailed explanation-1: -Virus and cell size comparison. Human viruses can vary in size but are generally in the range of 20–200 nm in diameter. In comparison, bacteria are generally 2–3 M in length, and an average human cell is 10–30 M.

Detailed explanation-2: -Most viruses vary in diameter from 20 nanometres (nm; 0.0000008 inch) to 250–400 nm; the largest, however, measure about 500 nm in diameter and are about 700–1, 000 nm in length. Only the largest and most complex viruses can be seen under the light microscope at the highest resolution.

Detailed explanation-3: -Most phages range in size from 24-200 nm in length. All phages contain a head structure which can vary in size and shape. Some are icosahedral (20 sides) others are filamentous. The head or capsid is composed of many copies of one or more different proteins.

Detailed explanation-4: -COVID-19 Learning Note: Viruses are much smaller than human cells; they’re even smaller than the bacteria in our bodies. Their tiny size makes them too small to see under a light microscope and detectable only by other means. It also means they are small enough to catch a ride on a tiny sneeze droplet.