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TAKS OBJECTIVE 3 TEKS OBJECTIVE 4(D) Bacteria: The Good and the Bad The student knows that cells are the basic structures of all living things and have specialized parts that perform specific functions, and that viruses are different from cells and have different properties and functions. The student is expected to (D) identify and describe the role of bacteria in maintaining health such as in digestion and in causing diseases. . Focus Question: Discuss and record your answer in your packet. • How can your life be shortened with bacteria? • How can your life be shortened without bacteria? Many species of bacteria can be found in the human mouth. Which of these explains the great variety of bacteria in the mouth? F Large volumes of air cause bacteria to change form. G Salivary glands cause mutations in bacterial populations. H The presence of nutrients makes the mouth a favorable habitat. J Calcium in the teeth provides a suitable pH environment. Virus/Bacteria Comparison Viruses Bacteria Non-living Living Cannot reproduce on their own without a host Contains DNA or RNA inside a capsid Can reproduce sexually or asexually Contain DNA inside a cell membrane and cell wall Some are pathogenic and some are helpful Always pathogenic What is unique to a bacterial cell? 1. Bacteria Cells have _______ 2. Bacteria Cells don’t have _______ Bacterial Growth • Binary Fission: the production two identical bacterial cells from one • Conjugation: exchanging of genetic material between two bacterial cells • Contain chemicals (and toxins) to aid in its survival in different environments Can be Helpful to Your Health • Digestion – E. Coli found in the intestine − Beans cannot be digested by ourselves and bacteria digests while producing gas − Produce vitamins B and K − Produce lactase, which breaks down lactose in milk • Production of… − Drugs − Hormones − Antibodies Can be Helpful to the Environment • Decomposition – Breakdown of oil – Involved in nitrogen fixation, an essential nutrient for living organisms • Fuel Production – Decompose sewage, garbage, and compost to produce methane – Also produces gasoline, biodiesel, and ethanol Overgrowth Causes Diseases • Pathogenic- harmful bacteria that damages tissue or producing toxins Examples: – Streptococcus- infection that causes strep throat – Staphylococcus- infection of the skin; also produces toxins – Dental cavity-causing bacteria Destroying Bacteria • Treated with Antibiotics • Prevented with Vaccines by stimulating the immune system • Limiting interaction with others with bacteria • Antiseptics can kill bacteria on the skin before it enters the body – Antibacterial soap – Hand sanitizer EXPLANATION • NECESSARY VOCABULARY: – Binary Fission – – Conjugation – – Nitrogen Fixation – – Prokaryote – Antibiotics – – Binary Fission: asexual reproduction of prokaryote cells where one cell splits into two identical cells – Conjugation: the transfer of genetic material from one bacteria to another – Nitrogen Fixation: process of bacteria converting nitrogen to be used by living organisms – Prokaryote: organism that lacks a nucleus and membrane-bound organelles – Antibiotics: chemical that kills bacteria TAKS Practice: Which organism lives in the human intestine and aids in the digestive process? A The bacterium Escherichia coli B The fungus Trichophyton rubrum C The protozoan Entamoeba coli D The algae Fucus vesiculosus Lactose is a naturally occurring sugar found in milk. Some dairy products, such as yogurt, may contain live bacteria. These products are useful to people who lack the ability to digest lactose. What does this information demonstrate? A Bacteria raise the acidity of processed foods. B Some bacteria interfere with digestion. C Bacteria can prevent insulin production. D Some bacteria are beneficial to human health. Streptococcus infection in a person’s throat can cause pain and fever. Streptococcus can be controlled by antibiotics. Streptococcus is a — F virus G bacterium H protozoan J fungus Which of these conditions is caused by bacteria? F AIDS G Seasonal allergies H Dental cavities J Colds Some bacteria thrive in hostile environments, such as salt flats, boilinghot springs, and carbonate-rock interiors, primarily because of bacteria’s — F biochemical diversity G small sizes H round shapes J methods of movement What I need to remember… • Write down the 3 most important things about this topic.
