EVERYDAY SCIENCE

Detailed explanation-1: -They are about 1/10th the size of a typical human cell. So, a microbe such as a bacteria cell would be the size of a cat or small dog in comparison to a human-sized animal-cell.

Detailed explanation-2: -Bacteria are cells too, but they’re only about one tenth the size of our cells. And viruses are smaller again-they’re about a hundredth the size of our cells. So we’re about 100, 000 times bigger than our cells, a million times bigger than bacteria, and 10 million times bigger than your average virus!

Detailed explanation-3: -The human body contains trillions of microorganisms-outnumbering human cells by 10 to 1. Because of their small size, however, microorganisms make up only about 1 to 3 percent of the body’s mass (in a 200-pound adult, that’s 2 to 6 pounds of bacteria), but play a vital role in human health.

Detailed explanation-4: -Most bacteria are 0.2m (micron) in diameter and 2−8m (micron) in length. Bacterial cells are about one-tenth the size of eukaryotic cells.

Detailed explanation-5: -Pelagibacter ubique is one of the smallest known free-living bacteria, with a length of 370 to 890 nm (0.00037 to 0.00089 mm) and an average cell diameter of 120 to 200 nm (0.00012 to 0.00020 mm). They also have the smallest free-living bacterium genome: 1.3 Mbp, 1354 protein genes, 35 RNA genes.