PPT-PROKARYOTES

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. TSW – Recognize that the presence of a nucleus determines whether a cell is prokaryotic or eukaryotic. 6.12B. Cells. There are two . basic types . of cells. Prokaryotes. or prokaryotic cells . Eukaryotes. Structure and Function. 2. Prokaryote & Eukaryote. Evolution. 3. Cellular Evolution. Current evidence indicates that . eukaryotes evolved from prokaryotes. between 1 and 1.5 billion years ago. Two theories:. PROKARYOTES. EUKARYOTES. CYTOPLASM. Cell Membrane. DNA. Always single-celled. No Nucleus. DNA is a simple,. Single loop. Small Cells. (1 – 10 . um. ). Bacteria. . Can be single- or multicellular . Homeotic Genes. Type of master gene that controls formation of specific body parts during development. Antennapedia. . Expressed in the thorax causes legs to form. Expressed in the head causes legs to form there also. Structure & Function. Dr.Qurat-Ul-Ain. Department Of Microbiology. KEMU,Lahore. . Two Basic Types of Cells. _____________________. ______________. Size of Living Things. 1 m = 100 cm = 1,000mm = 1,000,000 . 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 . 2. Prokaryote & Eukaryote. Evolution. 3. Cellular Evolution. Current evidence indicates that . eukaryotes evolved from prokaryotes. between 1 and 1.5 billion years ago. Two theories:. 1. . Infolding theory. 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.. Cellular organisms. In one of two domains: . Archaea. and Eubacteria. Generally smaller than eukaryotes. Most are unicellular, some form colonies or filaments. No membrane-enclosed organelles. Ribosomes are located in the cytoplasm. Biology Unit 04 Lesson 01. Prokaryotes – What are they?. Cells (usually single-celled) with no nucleus. Have no specialized organelles. Usually have: cell wall, cell membrane, ribosomes, genetic material, cytoplasm, and flagella or cilia. 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. . . microscopic single celled organisms. collective biomass – . 10x of all eukaryotes!!!!!. vast genetic diversity among members. physical diversity. shapes: . spheres (. coccus. ), rods (bacilli) and spirals. Warm Up- 8/21. What level of organization is this picture an example of?. Good Things. Levels of Organization Card Sort. Lab Tables (4 group members). 5 Minutes Max. Levels of Organization Matching. 5 Minutes. 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. .