How do bacteria move? The structures involved in the movement of bacteria are:

Most of the bacteria that can move rely on their own locomotor organs - the role of flagella, flagellar movement is a major form of movement of bacteria, but there are some bacteria that do not use flagella to move, and there is no similar locomotion organ can be found at all, but they can slide on the surface of the solid, some of them rotate along their own long axis, and some seem to move with only one side of the solid surface, this kind of bacteria is called gliding bacteria, but their speed of sliding is much slower than swimming with flagella, Moving forward about three microns per second, some spirochetes in bacteria.

In addition to crawling or wriggling on solid surfaces, they can also flex their bodies to move forward in waves, and they can complete this difficult movement completely by the action of the axes wrapped around the body, but they are wrapped around the spiral body, not scattered outside the body. Aquatic photosynthetic bacteria in some lakes.

There are several to hundreds of protein film encapsulated air sacs in the body, and the function of the air sac is somewhat similar to that of a fish scoop, which can adjust the height of the bacteria in the water by inflating or deflating, so that the bacteria can photosynthesize at the most suitable depth of the water body.

The bacterial flagella are arranged in different ways. Bacteria can have a separate pole flagella at one end, or a cluster of flagella. The surface of the perichoderma has scattered flagella.

Motile bacteria can rely on flagellar bacteria to glide or change buoyancy to move around. Another group of bacteria, spirochetes, have flagellar-like structures called axonaments that connect the two cell membranes of the periplasm. As they move, the body takes on a twisted spiral.

Spirochet, on the other hand, does not have axonal filaments, but it does have flagella. Motile bacteria can be attracted to or expelled by specific stimuli, an action called chemotaxis, phototaxis, mechanism. In a particular type of bacteria, slime bacteria, individual bacteria attract each other and clump together to form a fruiting body.

Answer] :d flagella is a locomotor organ composed of proteins on the closed surface of the slag of the gastrogenous body of the flagellates, which is divided into single flagella, double flagella, sclump flagella and periflagella, all of which are related to bacterial motility. The pili and sexual pili are also located on the surface of the thallus, but they are shorter and have no motor function.

The capsular membrane is a mucus layer outside the wall of some encapsulated bacteria such as the fissure, and it also has no motor function. Therefore, the answer to this question is d. It's easy to make the wrong choice A.

The structures involved in the movement of bacteria are axonal filaments, flagella.

1. The axonal filament is a straight filamentous structure from the bottom of the mucocytes of the ctenophores to the basement membrane of the epidermis, and is surrounded by elastic spiral filaments. It is a linear structure on the central axis of the spongy bone needle spoke. The central axis is made of calcareous or siliceous.

Bacteria refer to one of the major groups of organisms and belong to the bacterial domain. It is also the most abundant group of all organisms, with an estimated total of about 5,10,30 individuals. The shapes of bacteria are quite diverse, mainly globular, rod-shaped, and spiral-shaped.

2. Bacteria are prokaryotes, with a cell structure but no formed nucleus, only a nuclear area, which is a place where genetic material is stored, and there are generally not many toxic bacteria, and food spoilage is only because of the growth and reproduction of microorganisms.

Capsular Introduction:

1. The substance related to the invasiveness of bacteria is the capsule. The capsule is the surface structure of the bacterium, which has an antiphagocytic effect and is related to invasion. The capsule is a special structure on the surface of some bacteria and is a loose layer of mucus located on the surface of the cell wall.

The structural capsule related to bacterial invasion is a loose and transparent mucus layer produced by some bacteria in the cell wall during the life process.

2. The internal substance related to the invasiveness of bacteria is the capsule, which is the surface structure of the bacterium, which has the effect of anti-phagocytosis and is related to the invasiveness. The capsule is a special structure on the surface of certain bacteria and is a loose layer of mucus material located on the surface of the cell wall.

Hello, bacteria mainly have three modes of operation: 1 respiratory tract: bacteria or viruses are stored in the respiratory tract of patients or carriers, with coughing, sneezing or loud talking sprayed droplets, floating in the air, once a healthy person inhales, there is a possibility of disease, there are respiratory tract-transmitted diseases such as tuberculosis, pneumonia, epidemic meningitis, whooping cough, measles, etc.

2. Digestive tract: dysentery, typhoid, infectious hepatitis and other digestive tract infectious diseases can excrete a large number of bacteria or viruses through feces. This spike 3 is in direct contact:

It refers to the infection caused by direct contact between people or between humans and animals, such as syphilis, rabies, etc., caused by direct contact with pathogenic bacteria through the wound during traumatic infection.

Bacteria move in different ways. Bacteria without flagella are mainly passively moving, i.e., driven by wind, water, etc. Flagellar bacteria can use the wobble movement of flagella in a liquid environment.

Most of the bacteria that can move rely on their own locomotor organs - the role of flagella, flagellar movement is a major form of movement of bacteria, but there are some bacteria that do not use flagella to move, and there is no similar locomotion organ can be found at all, but they can slide on the surface of the solid, some of them rotate along their own long axis, and some seem to move with only one side of the solid surface, this kind of bacteria is called gliding bacteria, but their speed of sliding is much slower than swimming with flagella, Moving forward about three microns per second, some of the spirochetes in bacteria are also unique in their ability to crawl or wriggle on solid surfaces, as well as flexing their bodies in wavy forward motions, and they can perform this difficult maneuver by relying entirely on the axial filaments that are wrapped around the body, but they are wrapped around the spiral body, not scattered outside the body. The aquatic photosynthetic bacteria in some lakes have several to hundreds of protein film wrapped air sacs, and the function of the air bag is somewhat similar to that of a fish scoop, which can adjust the height of the bacteria in the water by inflating or deflaring, so that the bacteria can photosynthesize at the most suitable depth of the water body.

1. Non-staining inspection, directly use live bacteria smears to observe bacterial activity under the dark field microscope, phase contrast microscope, or ordinary microscope.

Generally, flagellar bacteria are motivated.

There are pressure drop method (directly use a glass slide to drop a drop of normal saline and pick a live bacterial smear, cover the coverslip carefully, and observe under the microscope) and hanging drop method (use a concave glass slide, the bacterial solution drops on the coverslip, inverted to form a hanging drop, and the surrounding area is coated with petroleum jelly.

Can be stored for a long time) two.

2. Semi-solid medium borrowing.

The inoculation needle is taken from the bacteria and the seeds are punctured vertically, and the growth of the inoculation line and its surroundings is observed after incubation, and the motility of bacteria can grow around the inoculation line, causing blurring.

If there is no motive force, the inoculation line is clearly visible, and there is no growth around it.

The structure of bacteria is relatively simple, 1. Basic structure: The basic structure of bacteria includes the cell wall.

Cell membrane, cytoplasm, and nucleoplasm.

2. Special structure: The special structure of bacteria includes the capsule.

flagella, pili, and spores.

Flagella are locomotor organs of certain bacteria and are made up of an elastin called flagellin that is structurally different from eukaryotes.

flagella. Bacteria can change the state of motion by adjusting the direction of flagella rotation (both forward and counterclockwise).

In the special structure of bacteria, flagella are elongated, curved filaments attached to the cell wall of some bacteria, which are the locomotor organs of bacteria.

Ordinary bacteria do not move on their own, but some fungi (people who do not have professional knowledge often count fungi as bacteria, and I will also talk about something related to fungi here) such as slime molds will move on their own, but the movement speed is very slow, and they only move a few centimeters after being cultivated in the laboratory for a long time.

The bacteria on your hands don't move on their own, but they may spread into the air and enter your body with your breath. There is no voluntary movement of bacteria, but they can thrive in some suitable environments, such as certain bacteria that like temperature and humidity may accumulate in your nasal passages.

In fact, not all bacteria are flood beasts, there are kilograms of bacteria in the human body, and most of these bacteria are probiotics, which play a great role in human life activities. The bacteria that usually parasitize on the surface of the human body come from about 19 phyla, 205 genera, and there are many species, but the bacteria have their own balance, as long as this balance is not broken, it will not have a great impact on the human body. So don't be too nervous about the bacteria.