Biology presentation on bacteria. Presentation "Bacteria"

Biology presentation on bacteria. Presentation "Bacteria"


Bacteria are prokaryotes.
These are the simplest, smallest and
widespread organisms,
which exist on earth for more than 2 billion years, but at the same time constantly
developing. bacteria so
differ from other living organisms that they are isolated in a special kingdom. There are not many places in the world that are devoid of bacteria.
They live in water, soil, air,
inside and on the surface of animal bodies
and plants.

The structure of a bacterial cell


Bacterial cells are very small.


cocci (spherical) - single

diplococci (collected in twos)

streptococci (in the form of a chain)

staphylococci (in the form of a bunch of grapes)

sarcinas (in the form of dense packs)

bacilli (rod-shaped)

convoluted - vibrios (in the form of a comma)

spirilla (one or more
correct curls)

Bacteria are classified into two groups based on their mode of nutrition.

(they are unable
and eat ready)

organic matter

Heterotrophs are divided into three groups

bacteria that
eat organic
dead substances
(lactic acid
decay bacteria)

close cohabitation
bacteria with live
each other
(nodule bacteria
on the roots of legumes)

Slide #10

Most bacteria can use almost any organic compound as an energy source, even substances used to destroy them (for example, penicillin, which kills many bacteria). This is due to the fact that bacteria can live both in the presence of oxygen in the environment and in its absence.

Slide #11

Bacteria can be divided into two groups based on their mode of nutrition.

(decompose organic matter without the participation of oxygen)

(during breathing
use oxygen
for the oxidation of organic matter)

Slide #12

In relation to the temperature of development, bacteria are also very diverse: some develop in a wide range of temperature changes, others only at certain temperatures (low, high, or in a narrow temperature range).

Slide #13


Under favorable conditions, bacterial cells multiply very quickly, dividing in two. If a cell doubles every half hour, then it can produce 281474976710656 descendants per day. And some bacteria can multiply even faster.

Slide #14

The rapid multiplication of lactic acid bacteria in milk leads to the fact that it turns sour in a matter of hours.

Slide #15

Slide #16

Spore formation

Under unfavorable conditions, for example, with a lack of water, many bacteria go into a dormant state. The cell loses water, shrinks somewhat, and remains dormant until water reappears. Some species survive periods of drought, heat, or cold in the form of spores. The formation of spores in bacteria is not a way of reproduction, since each cell produces only one spore and the total number of individuals does not increase.

Slide #17

When a spore is formed, the cell shrinks, rounds off within the existing cell wall and releases a new thick wall inside the old one. Under favorable conditions (in humid conditions), the spore germinates. The spores are very resistant: they withstand prolonged drying, boiling for several hours, dry heating up to 140oC. Some spores can withstand temperatures as low as -245oC. They are also resistant to the action of toxic substances, remain viable for a long time. So, anthrax sticks remain viable, remaining in the form of spores for 30 years.

Slide #18

Survival of bacteria on drying

Vibrio cholerae up to 2 days
Plague wand up to 8 days
Diphtheria stick up to 30 days
Typhoid stick up to 70 days
Tuberculosis bacillus up to 90 days
Staphylococcus aureus up to 90 days

Slide #19

The positive value of bacteria

It is determined by their participation in many biological processes, especially in the circulation of substances in nature. Bacteria, as a result of their vital activity, are able to decompose complex organic compounds into simple inorganic substances, which are again used by green plants. Bacteria are able to decompose proteins, carbohydrates, fats.

Slide #20

A number of substances formed by bacteria as a result of metabolism are very valuable for humans. The activity of bacteria is used in various branches of industry and agriculture for the production of lactic acid products, for sauerkraut, forage ensiling, for the production of organic acids, alcohols, acetone, enzymatic preparations, etc.

Slide #21

At present, bacteria are becoming extremely important as producers of many biologically active substances (antibiotics, amino acids, vitamins, etc.) used in medicine, veterinary medicine, and animal husbandry. Without the participation of bacteria, the processes that occur during the preparation of leather for tanning, maceration of flax and hemp fibers are impossible.

Slide #22

Humans also use bacteria to treat wastewater: when the wastewater is slowly passed over gravel and sand, solid particles settle and, under the action of various bacteria, turn into a material that, after drying, is used as fertilizer. When passing through sand and gravel, disease-causing bacteria die and are digested by putrefactive bacteria.

Of the plant diseases caused by bacteria, the following are known: a burn that affects fruit plants - apple trees, pears, etc .; black rot of cabbage; soft rot of many plants; tumors of plant roots Despite the harm brought (bacterial root cancer); tumor-like growths on leaves (galls), etc.

summary of presentations


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bacteria. To study the features of the structure and vital activity of bacteria. Show the role of bacteria in nature and human life. Forms of bacteria. Cocci bacillus vibrio spirilla. The structure of bacteria. Bacteria are single-celled, simply organized pre-nuclear organisms. ..\2006-05-24\Scan10095.JPG. Spread of bacteria. Why are bacteria widespread in nature? Reproduction. Dispute formation. The survival of bacteria is facilitated by: High reproduction rate under favorable conditions; dispute formation. Food. The role of bacteria in nature. Saprophytic bacteria of decay (participants in the cycle of substances in nature, orderlies of nature). - Bacteria.ppt

Lesson Bacteria

Slides: 34 Words: 289 Sounds: 3 Effects: 24

Kingdom of bacteria General characteristics of bacteria. Lesson Objectives: To introduce students to the structural features and diversity of bacteria. develop mental operations of classification, comparison, generalization, the ability to draw conclusions, communication skills. to promote the education of respect for the environment, the aesthetic education of schoolchildren. Dear Guys! I know that each of you is the smartest, most erudite student. What is bacteria? Bacteria are ... 1) Unicellular organisms. 2) Cells without a nucleus. 3) Very small organisms 4) Pre-nuclear organisms. There is only a nuclear envelope. - Lesson Bacteria.ppt

Classes of bacteria

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What organisms are we talking about? bacteria. The structure of a bacterium. Prokaryotes. Basic terms and concepts. Bacteria shape. Diplococci. Bacillus. classes of bacteria. Vibrios. Spirilla. Bacterial cells have a nucleus. Food. Breath. Sporulation. Autotroph. Aerobe. Bacterial spores. Importance of bacteria in nature. cyanobacteria. Nodule bacteria. classes of bacteria. Importance of bacteria in human life. Tuberculosis. Botulism. Venereal diseases. Purulent infections. Cholera. Intestinal disorders. Typhoid fever. Measures to prevent bacterial diseases. Microbiology. The activity of bacteria. Streptococcus. - Classes of bacteria.ppt

Bacteria grade 6

Slides: 12 Words: 275 Sounds: 0 Effects: 3

Kingdom of bacteria

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Biology Bacteria

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General characteristics of bacteria. Bacteria are the oldest group of organisms. Biology lesson. The first bacteria probably appeared more than 3.5 billion years ago. Bacteria size. A quarter of a million bacteria fit in a dot. The study of bacteria. The structure of a bacterium. Bacteria are very small unicellular organisms. Bacterial cells are called non-nuclear. living conditions for bacteria. Bacteria live in different natural conditions. Bacteria that need oxygen to live are aerobes. Bacteria for which oxygen is harmful - ANAEROBES. Reproduction of bacteria. Bacteria reproduce by dividing the cell in two. - Biology Bacteria.ppt

bacterial cell

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Variety of bacteria

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bacteria. Content. unicellular organisms. Forms of bacteria. Such different bacteria. fermentation bacteria. soil bacteria. Decay bacteria. Pathogenic bacteria. Check yourself. Correctly. Think more. Literature. - Variety of bacteria.ppt

The structure of bacteria

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The structure and activity of bacteria. Study the structure of a bacterial cell. The structure of a bacterial cell. permanent structures. cytoplasmic membrane. non-permanent structures. Bacteria sizes. Groups of true bacteria. Staphylococci. Vibrios. Heterotrophs. Saprophytes. organic compounds. Oxygen. Reproduction of bacteria. - Structure of bacteria.ppt

The structure and significance of bacteria

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The structure of bacteria. The cells of many bacteria have non-chromosomal genetic elements - plasmids. Flagella. Among bacteria there are many mobile forms. Flagella play the main role in locomotion. The flagellum filament consists of 3-11 helically twisted fibrils formed by the flagellin protein. When adverse conditions occur, some bacteria produce endospores. When favorable conditions occur, the spore germinates and a vegetative cell is formed. Another group, autotrophs, is able to synthesize organic substances from inorganic ones. Physiology of bacteria. - Structure and meaning of bacteria.ppt

Bacteria life

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bacteria. Modern education. Tasks for diagnostics. Tasks for students. Motivation for learning activities. Formulation of the topic of the lesson. Learning new material. Complete the task. Forms of bacterial cells. Reproduction of bacteria. Nutrition of bacteria. Bacteria's ability to survive. Fixing the new. control task. Match the definitions with the studied terms and concepts. Work in pairs. Personal development. Thank you for your attention. - Bacteria life.pptx

Vital activity of bacteria

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Bacteria: structure and activity. In which organisms the body does not consist of cells. General characteristics of bacteria. Can you see bacteria? Cell shape. Forms of bacteria. The structure of a bacterial cell. Prokaryotes and eukaryotes. Bacteria feeding methods. living conditions for bacteria. Reproduction of bacteria. Unfavorable environmental conditions. Fizkulminutka. Complete interactive tasks. reflective target. Homework. - Life activity of bacteria.pptx


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Chemosynthesis. Chemosynthesis is... This way of obtaining energy is used only by bacteria. Chemosynthesis was discovered in 1887 by S. N. Vinogradsky. Sulfur bacteria. Iron bacteria. nitrifying bacteria. hydrogen bacteria. Metanobacteria. Chemosynthesis is described by the reaction 4H2 + CO2 = CH4 + 2H2O. The meaning of chemosynthesis. Some chemosynthetics (in particular, sulfur bacteria) are used for wastewater treatment. 1. Compare photosynthetics and chemosynthetics. Eliminate the excess. Find a match. - Chemosynthesis.ppt

Chemosynthesis of bacteria

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Metabolism. Chemosynthesis. What do the inhabitants of these communities eat? The necessary enzyme systems are present in a number of bacterial species. Bacteria working with hydrogen, nitrogen compounds and methane also come into play. Back in 1887, the Russian microbiologist S.N. Winogradsky discovered bacterial chemosynthesis. Born in 1853 in Russia Died in 1953 in France. Oxygen-free (anaerobic) respiration. Anaerobic chemoautotrophs. The molecular oxygen that appeared in the Earth's atmosphere acted as a strong oxidizing agent. Nitrifying bacteria - oxidize ammonia to nitrate. Iron bacteria - able to oxidize ferrous iron to ferric. - Chemosynthesis of bacteria.pptx

Importance of bacteria

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Importance of bacteria. Bacteria are prokaryotes that have existed on Earth for more than 2 billion years. Bacteria are a key factor in soil formation, oxidation zones of sulfide and sulfur deposits, and the formation of iron and manganese sedimentary rocks. When dying, plants enrich the soil with nitrogen compounds. The production of many food and technical products is impossible without the participation of various fermentative bacteria. As a result of the vital activity of bacteria, curdled milk, kefir, cheese, as well as enzymes, alcohols, and citric acid are obtained. To prevent the development of the disease and acquire immunity, a vaccination method has been developed in the form of a vaccine. - Meaning of bacteria.pptx

The role of bacteria in nature

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Bacteria in the human body

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Bacteria in the human body. characteristics of bacteria. The spread of bacteria. Species Bdellovibrio bacteriovorus. Flexibacteria. Normal cohabitants in the body. symbiotic bacteria. Skin covers. Pathogenic bacteria. Epidemic cerebrospinal meningitis. bacteria. Causative agents of intestinal diseases. Causative agents of respiratory diseases. Causative agents of especially dangerous infections. Intermediate hosts of pathogenic bacteria. Carriers of anthrax. Plague carriers. Disease carriers. Disease carriers. Fight against pathogenic bacteria. Compliance with the rules of personal hygiene. - Bacteria in the human body.ppt

The role of bacteria in human life

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Kingdom of bacteria. Write the word "bacteria" in your notebook and draw a crown. Let's talk about the structure of bacteria first. Cocci are the simplest forms of bacteria. Streptococcus is a chain of cocci. Staphylococcus is a bunch of cocci. Write the word "cocci" in your notebook. Elongated bacteria are called rods. Flagellum. Vibrio. Spirilla. Are bacteria harmful or beneficial? The benefits of bacteria are many. Bacteria are cooks. Milk. Cottage cheese. Lots of different products. Salted cucumbers. Cabbage. Benefits of bacteria. Escherichia coli. Bacteria cause disease. Food spoils due to bacteria. Harm from bacteria. - The role of bacteria in human life.ppt

Bacteria - pathogens

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Bacteria are the causative agents of acute diseases. bacteria. Especially a lot of bacteria in the soil. bacterial cell. The role of bacteria Harm to the national economy. Pathogenic bacteria. Several "lines of defense" against pathogens. Black potato leg. Bacteria cause human disease. - Bacteria - causative agents of diseases.pptx

Bacteria living in the human body

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Bacteria in the human body. Content. Bacteria review. characteristics of bacteria. The spread of bacteria. spiral bacterium. Flexibacteria. Normal cohabitants in the body. Colon. Skin covers. Pathogenic bacteria. Epidemic cerebrospinal meningitis. Diphtheria. Causative agents of intestinal diseases. Causative agents of respiratory diseases. Causative agents of especially dangerous infections. Intermediate hosts of pathogenic bacteria. Carriers of anthrax. Plague carriers. Ticks. Disease carriers. Fight against pathogenic bacteria. - Bacteria living in the human body.ppt


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Team. Vibrios. Content. Genus of bacteria. Straight or curved sticks. facultative anaerobes. Nitrogen content. Sensitivity. Disease. Cholera. epidemic disease. Vibrio cholerae. classic cholera. Treatment. Prevention. Complex of restrictive measures. Vibrios. Thank you for your attention. - Vibrios.pptx


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SRS Topic: “Proteus. Ecology. Etiology and pathogenesis. Laboratory.diagnostics. Prevention and treatment". Checked by the teacher: Zavorokhina O.A. Ministry of Health of the Republic of Kazakhstan. Semey State Medical University. Department of Clinical Microbiology. Plan: Proteus. (lat. proteus) - a genus of gram-negative, spore-forming, facultative anaerobic bacteria. A representative of the normal, conditionally pathogenic microflora of the human intestine. Proteus in the taxonomy of bacteria. The genus Proteus. proteus vulgaris. proteus hauseri. proteus mirabilis. proteus myxofaciens. proteus penneri. - Proteus.ppt


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The concept of microorganisms. The impact of microbes. Microorganisms. The impact of microbes on food. Beneficial effect. The soil. Pathways for microbial entry. Prevention of infections. Diseases transmitted through food. First aid for food poisoning. Read the statements. Answers. Microorganisms. Food hygiene rules. Rationale for the rules. - Microorganisms.ppt

Bacteria and microorganisms

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Bacteria and microorganisms. Classification of microorganisms. Bacteria are prokaryotes. View. The form. Breath type. Strains of the same species. The main groups of microorganisms. coccoid bacteria. Tetracocci. rod-shaped microorganisms. Convolute forms of microorganisms. Classification of microorganisms according to Bergey. The role of microorganisms in the etiopathogenesis of diseases. Schematic representation of various bacteria. The structure of a bacterial cell. Nuclear device. cytoplasmic membrane. Capsule. Monotrichs. fimbriae. Spore formation in bacteria. Endospores. Sporulation. Bacteria produce only one spore. - Bacteria and microorganisms.pptx

Physiology of microorganisms

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Physiology of microorganisms. Lecture plan. Biochemical and energy processes. Chemical composition bacteria. Thin physico-chemical studies. Cellular metabolism. Constructive and energy metabolism. Constructive metabolism of prokaryotes. Autotrophs. The degree of expression of heterotrophy in bacteria. Many microbes can be grown. Most of the bacteria that inhabit the globe. wild strains of bacteria. Energy sources and electron donors. Phototrophic bacteria are able to use the energy of sunlight. For the implementation of diverse reactions, the cell needs electrons. - Physiology of microorganisms.ppt

Ecology of microorganisms

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Microflora. Spread of microbes. The value of studying ecology. Biosphere. Types of biocenoses. Sanitary microbiology. Methods for assessing the sanitary and epidemiological state. indirect methods. total microbial count. Microorganisms. Properties of sanitary-indicative microorganisms. Characteristics of soil microflora. Indicators of prescription of soil pollution. Microbiological standards for drinking water. Indicators characterizing the microbial purity of the air. - Ecology of microorganisms.ppt

The influence of the external environment on microorganisms

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The effect of environmental factors on microorganisms. Disinfection. Classification of microorganisms. Events. Disinfection methods. Disinfectants. Classification of disinfectants. disinfection efficiency. Sustainability. Sterilization. Sterilization methods. gas method. Sterilization quality control. Antiseptics. Chemical substances. Types of antiseptics. Asepsis. -

slide 1

Bacteria - friends or enemies of man?
Prepared by: 4th grade student Milena Mirzoyan

slide 2

Plants and animals are made up of tiny cells. Some of the cells can live independently, one by one. Are there organisms smaller than cells? It turns out yes! This is bacteria. Scientists suggest that bacteria were the first living things to appear on Earth. The kingdom of bacteria is comparable to the kingdoms of animals and plants. Bacteria are much smaller than cells. Most of them are less than one thousandth of a millimeter in size. It is no coincidence that bacteria are sometimes called microbes (from the Greek mikros - small and bios - life). But everyone says that microbes are very harmful to humans. I decided to study this problem and find out whether all bacteria are really harmful to humans, and whether there are bacteria that benefit people. The purpose of the study: to study the influence of bacteria on the human body and their role in nature. Hypothesis: There are both harmful and beneficial bacteria for humans.

slide 3

slide 4

There are many types of bacteria. They have a variety of shapes. For example, spherical bacteria are called cocci.

slide 5

Bacteria reproduce simply by dividing in half. It only takes a few minutes! In a day, from one bacterium that has fallen into suitable conditions, tens of billions of exactly the same bacteria can form. The accumulation of bacteria that arose due to the division of one original bacterium is called a colony. Such colonies are clearly visible to the naked eye. They look like colored dots. Surely you have seen similar spots on a piece of stale sausage or cheese. Food spoils due to the work of bacteria!

slide 6

Bacteria need energy to live. Many of them get it by destroying nutrients created by other organisms. Some bacteria are able to multiply in the human body. They can be very dangerous, causing diseases: plague, tuberculosis, dysentery, cholera, gangrene and many others. Festering pimples, inflamed wounds are the consequences of the body's struggle with bacteria that have penetrated inside.

Slide 7

Anthrax bacterium (Bacillus anthracis) is the causative agent of a dangerous disease - anthrax. This acute infectious disease often leads to the death of the patient.

Slide 8

Some spirilla (bacteria in the form of spirally twisted rods) are pathogens of animal and human diseases.

Slide 9

So bacteria are the enemy? Not certainly in that way. Many of them live off the nutrients of dead organisms. Such bacteria are called saprophytes (from the Greek sapros - rotten). Saprophyte bacteria destroy fallen leaves and wilted grasses. As a result, plant residues turn into humus, that is, into a fertile part of the soil. Soil would not have appeared on our planet if saprophyte bacteria had not destroyed plant and animal remains!

Slide 10

Saprophytic bacteria are involved in pickling cucumbers, mushrooms, and sauerkraut.

slide 11

And there are bacteria that live in the human body and are his assistants. We are talking about beneficial E. coli - bacteria that live in the intestines. They help digest food. Organisms of different species that help each other are called symbionts (from the Greek sym, syn - together and bios - life). We can say that E. coli is a human symbiont. Every healthy person has billions of such E. coli!

slide 12

Nowadays, it is clear to everyone what a huge role vitamins play. Without them, the life of people and animals is impossible. Another thing is also known: a person receives vitamins from food. However, few people are probably aware that some vitamins are created in the body. The B vitamins and vitamin K, which are very important for us, are formed in the intestines with the help of Escherichia coli.

biology lesson 5th grade teacher Tsarapina A.N.

REMEMBER! 1. In which organisms does the body not consist of several cells? 2. What kingdoms of organisms divide the living world?

GOALS: 1. To study the features of the structure and vital activity of bacteria. 2. Show the role of bacteria in nature and human life

bacteria - These are primitive unicellular organisms, in the cytoplasm of which there is no formed nucleus. The nuclear substance is distributed throughout the cytoplasm. Bacteriology The branch of microbiology that deals with the study of bacteria.

? 1. What process underlies the increase in the number of bacteria? 2. How do you think bacteria can reproduce?

Bacteria nutrition create themselves, and also feed on ready-made nutrients.

4. Soil bacteria 5. Bacteria of decomposition and decay

1. Participate in the formation of soil structure and fertility 2. Formation of minerals 3. Maintain reserves of carbon dioxide and oxygen in the atmosphere

1. lactic acid bacteria

harmful bacteria to humans pathogenic bacteria

A1. Bacteria are organisms: 1. only unicellular; 2. only multicellular; 3. both unicellular and multicellular A2. A bacterial cell contains: 1. shell, cytoplasm, nucleus; 2. cytoplasm, nucleus, nucleic acid; 3. shell, cytoplasm, nucleic acid

A3. Bacteria: 1. feed on ready-made nutrients; 2. they themselves are able to create nutrients; 3. 1 and 2 are correct.

A4. Determine the correct sentence. 1. Bacteria belong to the animal kingdom 2. Bacteria belong to the fungi kingdom 3. Statements 1 and 2 are not true

A5. Determine the correct sentence. 1. All bacteria harm other living organisms. 2. all bacteria benefit only humans. 3 Man Uses Bacteria To Create Certain Foods

Homework 1. § 11 p. 44 of textbook 2. optional write reports on human bacterial diseases and their prevention

History of the study of bacteria

  • Bacteria were first seen through a microscope and described by the Dutch naturalist Anthony van Leeuwenhoek in 1676.

Leeuwenhoek's drawings

Shapes of bacteria

Bacteria, depending on the shape of the cells, are divided into several groups: spherical - cocci, rod-shaped - bacilli or rods, spiral - spirochetes

blue green algae

Blue-green algae are also bacteria. They are capable of photosynthesis, like plants, and do not need organic matter for nutrition.

Importance of bacteria

Importance of bacteria

  • Bacteria are found in soil, in the air, in lakes and oceans.
  • They live in the cold, in the ice of the Arctic.
  • In hot sands of the desert, and in hot acid springs.
  • Some bacteria tolerate very high salinity with temperatures above 90 degrees, they were found in the Dead Sea (Israel).

  • In the atmosphere, they are found in water droplets, and there are many of them where the air is dusty.
  • In cities, rainwater contains more bacteria than in the countryside.
  • There are few of them in the cold air, but they are there.

  • Bacteria play an important role both in nature and in human life. Some of them are harmful to organisms (plants, animals, humans) because they cause diseases. But the ability of bacteria to actively process organic matter makes them indispensable.

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