PPT-Viruses Smallest unicellular organisms that are obligate intracellular.

Viruses are the most primitive microorganisms infecting man General properties Obligate intracellular Possess either DNA deoxyribonucleic acid or RNA ribonucleic acid but never both Smaller than bacteria can be passed through the bacterial filters. Unicellular organisms perform the same life processes as multicellular organisms. Individually, these cells can only be seen using a microscope. For this reason, unicellular organisms are o en called A . virus. is a small . infectious agent. that can replicate only inside the living cells of organisms. Most viruses are too small to be seen directly with a . microscope. . Viruses infect all types of organisms, from . Multicellular. Which is better?. Questions to Consider. How quickly can it reproduce?. How specialized can it be?. How large can it grow?. How long does it take to develop?. How long can it live?. How quickly can it adapt and evolve?. http://www.worldofteaching.com. A . view. of . the. . cell. . The Cell. The basic unit of an organism. Discovery made possible by the invention of the microscope. The. . history. of . the. . cell. Taxonomy is the science of naming and classifying organisms. The system used by biologists is called the . Linnnaean. System.. Carl Linnaeus was a Swedish biologist in the mid-1700s. He popularized a system of grouping organisms according to like characteristics and giving each group a specific name.. LESSON 3. Unicellular Organisms. Organisms that consist of one cell. . They are also known as microorganisms. They also carry out all the life processes such as movement, response, respiration, digestion, excretion, reproduction, and growth. Unicellular Organisms. vs.. Multicellular Organisms. Background information. What does “micro” mean?. What is a microscope?. What is an organism?. What does “multi” mean?. What is a cell?. Micro. Made of only one cell!!. With a partner...brainstorm answers to the following questions. How do you think . unicellular organisms. ...eat, move, get rid of wastes, and reproduce?. 2) How do . multicellular. The Diversity of Life. Taxonomy . is the study and practice of classifying living organisms.. Modern taxonomy uses the three domain system.. Domain . Archaea. : . Unicellular and live in harsh environments; no nuclei. Biology: Science of Life What do Biologists do? Study past, present and future life Interactions, structures , functions Solve biological problems Agriculture Disease Conservation/Remediation to maintain diversity of life use many of the host cell’s biochemical mechanisms and products to sustain their viability. A mature virus(virion) can exist outside a host cell and still retain its infective properties.. . 3. the virus. Fitua. Al-. Saedi. Department of Clinical Laboratory Science. College of Pharmacy. Medical Microbiology. Microbiology . Is . the study of Microorganisms, a large and diverse group of microscopic organisms existing as single cells or clusters. Micro- organisms include some eukaryotes and prokaryotes, viruses, . Your Objective. 1. You will understand that . organisms. are composed of one or more . cells. . . 2. You will . identify the basic characteristics of organisms: . unicellular organisms. multicellular organisms. WILF: . To know how unicellular living things are able to carry out life processes, and be able to say how they are different from animal and plant cells.. Starting point...... Can you remember what the difference between a multi-cellular organism and a unicellular organism is? Write it down as a sentence..