AP BIOLOGY

Detailed explanation-1: -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-2: -All bacteria are unicellular, and all are prokaryotic. Prokaryotes are organisms that are made of one prokaryotic cell, which is a cell type that lacks membrane-bound organelles and has no true nucleus.

Detailed explanation-3: -Examine the data in Table 1. We have listed the pathogens in size order: from the largest – the multicellular (which means many celled) parasites – in the top row, to the smallest – prions [pry-onz] – in the row second from bottom, above the column total.

Detailed explanation-4: -Named Thiomargarita magnifica, they live by oxidizing sulfur, and are 50 times bigger than any other known bacteria. Biologist Olivier Gros found the bacteria in 2009 while exploring the mangroves of Guadeloupe, where he works at the University of the Antilles in the French West Indies.