PPT-Prokaryotes Chapter 23 Features of Prokaryotes

Cellular organisms In one of two domains Archaea and Eubacteria Generally smaller than eukaryotes Most are unicellular some form colonies or filaments No membraneenclosed organelles Ribosomes are located in the cytoplasm. GTAC. Learning Outcomes. Students recognise that there are different levels of classification – the largest being the five kingdoms which are based on cell structure.. Distinguishing plant cells from animal or fungal cells.. Eubacteria & . Archarbacteria. Prokaryotes. Unicellular organisms that lack a nucleus. Prokaryotes are identified by characteristics such as shape, the chemical nature of their cell walls, the way they move, and the way they obtain energy.. Cell Theory. Every living organism consists of one or more cells.. The cell is the structural and functional unit of life.. All living cells arise by division of preexisting cells.. Cells contain hereditary material, which they pass on to their offspring during division.. Viruses . A nonliving (?) particle made of proteins, nucleic acids, and sometimes lipids (fats). Viruses only reproduce by infecting living cells. Most viruses can only be seen with an electron microscope. Prokaryotic . Structure. size1-5. m. m (resolution of the human eye ~750. m. m). . Cell wall. . main component is peptidoglycan (modified sugar polymers). . can be further differentiated performing a gram stain . 21.4 Prokaryotes—Enduring, . Abundant, and Diverse. Prokaryotes. Structurally simple cells that lack a nucleus. Evolved before eukaryotes . Abundance and Metabolic Diversity. Prokaryotes are Earth’s most abundant organisms. Single-celled organisms. Very tiny. Cannot be seen without a microscope. Our microscopes are not powerful enough. Lack a nucleus and most other organelles. Most numerous organisms on Earth. Extremely important organisms.. 0. PROKARYOTES. 16.7. Prokaryotes have inhabited Earth for billions of years. Prokaryotes are the oldest life-forms. And remain the most numerous and widespread organisms . Colorized SEM 650. . . GET READY TO USE THEM. STAND UP NOW . WITH CLICKERS IN HAND. WHEN I GIVE THE SIGNAL,. HOLD YOUR BREATH AS LONG AS YOU CAN.. I will count the time off.. When you can’t hold your breath any longer,. microscopic single celled organisms. collective biomass – . 10x of all eukaryotes!!!!!. vast genetic diversity among members. physical diversity. shapes: . spheres (. coccus. ), rods (bacilli) and spirals. Study Material for. . . B.Sc. Part II. . Botany . Hons. .. . . Paper IV. . Dr. Pushpanjali Khare. Sr. . What makes these two cell classes different?. Cells. The . cell. is the smallest unit of life in the universe.. ALL cells have two things in common:. They have . cell membranes. , which are barriers that separate the inside of a cell from the outside.. microbiology. Lecture-9. Microbial cell structure. Prokaryotes-2 . 1. Domains of living cells. . Principles of microbial cell structure . Elements of Microbial cell Structure. Eukaryotes. . Prokaryotes & chemistry of cellular components . Classifying Prokaryotes. The smallest and most abundant microorganisms on Earth are . prokaryotes. —unicellular organisms that lack a nucleus. . Prokaryotes have DNA, like all other cells, but their DNA is not found in a membrane-bound nuclear envelope as it is in eukaryotes. Prokaryote DNA is located in the cytoplasm. .