Two fundamentally different types of cells exist. Procaryotic cells have a much simpler morphology than eucaryotic cells and lack a true membrane-delimited nucleus. All bacteria are procaryotic. In contrast, eucaryotic have a membrane enclosed nucleus; they are more complex morphologically and are usually larger than prokaryotes. Algae, fungi, protozoa higher plants, and animals are eucaryotic Procaryotic and eucaryotic cells differ in many other ways as well
• Two fundamentally different types of cells exist. Procaryotic cells have a much simpler morphology than eucaryotic cells and lack a true membrane-delimited nucleus. All bacteria are procaryotic. In contrast, eucaryotic have a membraneenclosed nucleus; they are more complex morphologically and are usually larger than prokaryotes. Algae, fungi, protozoa, higher plants, and animals are eucaryotic. Procaryotic and eucaryotic cells differ in many other ways as well
Bacteria consist of only a single cell, but dont let their small size and seeming simplicity fool you. Theyre an amazingly complex and fascinating group of creatures Bacteria have been found that can live in temperatures above the boiling point and in cold that would freeze your blood They eat"everything from sugar and starch to sunlight, sulfur and iron there's even a species of bacteria-Deinococcus radiodurans--that can withstand blasts of radiation 1,000 times greater than would kill a human being ASt Cial
• Bacteria consist of only a single cell, but don't let their small size and seeming simplicity fool you. They're an amazingly complex and fascinating group of creatures. Bacteria have been found that can live in temperatures above the boiling point and in cold that would freeze your blood. They "eat" everything from sugar and starch to sunlight, sulfur and iron. There's even a species of bacteria—Deinococcus radiodurans—that can withstand blasts of radiation 1,000 times greater than would kill a human being
16 Chapter 1 Introduction: An Overview of Microbiology and Cell Biology (b) Figure 1. 14 Colonies formed on an agar-containing medium on a I'etri plate(a)Red colonies of the bacterium Serratia marcescens(top half of plate)streaked alongside colonies of a mutant derivative unable to make the red pigment(bottom half of plate).(b)Mixed colonies of ye low and purple pigmented bacteria
1.7 Laboratory Culture of microorganisms Figure 1. 13 Examples of microbial communities. (a)Adense com munity of algae and cyanobacteria in the surface waters of a nutri- ent-rich lake(Lake Mendota, Wisconsin).(b) Photomicrograph of a bacterial community that developed in the depths of a small lake (Wintergreen Lake, Michigan), showing cells of various sizes