NEET BIOLOGY

Detailed explanation-1: -Thiomargarita namibiensis may grow to be as large as 0.75mm in diameter. This makes them some of the largest bacteria ever discovered. Note: Pelagibacter ubique is one of the smallest known free-living bacteria, with a length of 370 to 890 nm and an average cell diameter of 120 to 200 nm.

Detailed explanation-2: -The world’s largest bacterium has been discovered amongst the mangroves of the Caribbean island of Guadeloupe. Measuring over a centimetre long, Thiomargarita magnifica is over 5000 times bigger than the average microbe.

Detailed explanation-3: -Protozoa (pro-toe-ZO-uh) are one-celled organisms, like bacteria. But they are bigger than bacteria and contain a nucleus and other cell structures, making them more like plant and animal cells.

Detailed explanation-4: -Viruses are much smaller. The largest of them are smaller than the smallest bacteria. Unlike bacteria, viruses can’t survive without a host. They can only reproduce by attaching themselves to cells.

Detailed explanation-5: -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.