Biological structure, hierarchy, organization, and organs
Beijing Normal University edition junior high school biology first volume,"The structure of the hierarchy of organisms" review draft mainly includes the following aspects: ##1. Introduction to the background This part was an important part of the biology textbook. It mainly involved the composition of organisms and the different levels of tissues and organs. ##2. Class Design 1. ** Teaching goal ** - Students should understand the basic structure of organisms. - Master the hierarchy of biological structures. - It could describe different levels of tissues and organs. - Cultivate students 'observation and analysis skills. 2. ** Teaching Points and Difficulties ** - The main point was to let the students understand the composition and structure of organisms. - The difficulty was to let the students master different levels of tissues and organs. 3. ** Teaching preparation ** - He needed to prepare the Beijing Normal University edition of the biology textbook for junior high school students. - Create a class that includes diagrams and text explanations. - a physical object or model prepared for demonstration or observation. 4. ** Teaching Steps ** - ** Introduction **: Use questions to introduce the topic. For example, ask the students what organisms are made of to stimulate their interest in learning. - ** Knowledge Explanation **: Explain the composition and hierarchy of organisms in detail with the use of coursewares and physical demonstration. It included cells (the basic unit of an organism, and cells are divided into different types according to their functions and structures), tissues (composed of the same or similar cells in a certain way, and different tissues have different functions), organs (composed of different tissues cooperating and having specific functions), and organ systems (composed of multiple organs to complete complex life activities). - [Learning Mission: Divide the students into groups and let the group cooperate to choose an organism to observe and describe, and analyze its tissues and organs at different levels.] - ** Discussion and Exchange **: Each group will send a representative to report the results. Other groups can ask questions or share their findings. The teacher will guide the discussion and exchange to deepen the students 'understanding of the biological structure. - ** Inductive summary **: The teacher will make a summary based on the students 'discussion and exchange to help the students sort out their thoughts and strengthen their knowledge and memory. Read more exciting novels for free
Biological Cell Structure
The cell was the basic unit of life activity. Its structure was complex and delicate. Different types of biological cell structures had certain commonalities and characteristics. 1. ** Cell membrane ** - [Constitution: It is mainly composed of a Phospholide Bilayer-layer as the basic skeleton, embedded with protein, and there is also a protein outside the membrane.] - [Characteristic: Has a certain degree of mobility and selective penetration.] - [Function: Protects cells and controls the entry and exit of substances.] 2. ** Cell plasma ** - [Constitution: Including the cellular stroma and the organelle.] - Function: The cellular matrix provides a place, substances, and certain environmental conditions for metabolism. There are many types of organelle, each with its own unique functions. For example, the mitochondria (double-layer membrane structure) is the main place for the cell to breathe oxygen (the second and third stages) and contains a small amount of DNA.(double-layered membrane structure, found in the green cells of plants) is the site of photosynthesis; The plasmatic reticule, Golgi apparatus, Ribosome, and Lysosome also played an important role in the synthesis, processing, transportation, and digestion of substances in the cell. Centrosome in animal cells was related to mitosis (higher plant cells did not have centrosome). The vesicles in plant cells had functions such as storage, digestion, and regulation of infiltration. In most mature plant cells, the vesicles accounted for about 90% of the entire cell volume. 3. ** Nucleus ** - Constitution: It is composed of nuclear membrane, nucleus, and Chromatin. - [Function: It is the main place where DNA is stored and replicated. It acts as the control center for cell genetics and cell metabolism activities.] Procaryotes (such as bacteria) had cell walls, cell membranes, protoplasts, and karyomes. There was only one type of organelle, the Ribosome. The bacteria did not have a formed nucleus. The nucleus was a karyomidium formed by the accumulation of genetic material. The karyomidium did not have a nuclear membrane or a nucleus. Fungi had cell membranes, protoplasts, and nuclei. The protoplasts of fungi included the cellular matrix and the organelle. The organelle included the ER, the mitochondria, the Golgi apparatus, the Ribosome, the Lysosome, and so on. Animal cells did not have a cell wall, and the cell plasma of animal cells did not contain plastids, nor did it form a central vesicle. Plant cells were composed of protoplasts and cell walls. Protoplasts included the nucleus and the plasma. In addition, viruses have no cellular structure and are made up of genetic material and protein. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The biological structure of the soil refers to
The characteristics of soil biological structure included many aspects. From the perspective of the proportion of producers, the proportion of producers in the soil ecosystem was small, and the organic matter mainly came from the aboveground plant residue. There are variations in space-time and there is a hierarchical structure. From the perspective of biological classification, there were microorganisms (including bacteria, fungi, protozoa, etc.), inverted animals (such as earthworms, ants, nematodes, etc.), plant roots, etc. Microorganisms could be divided into four types according to different energy and carbon sources: Chemotroph, Chemotroph, Phototroph, and Phototroph. Chemotroph covered most of the soil microorganisms. According to their feeding habits and functions, they could be divided into scavenger, fungivorous, predatory, herbivorous, parasitic and other types. From the perspective of the complexity of the horizontal structure, there were three reasons: the habit of parent distribution, the environmental discrepancy, and the interaction between species. Latitude, altitude, environment, time, and other factors would also affect the distribution of organisms in the soil. In addition, there were interactions between various organisms in the soil. For example, herbivores relied on the distribution of their food plants, and there were also relationships such as competition, mutualism, and partial symbiosis that affected the structural characteristics of soil organisms. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Biological articles on membrane channel structure
The membrane channel was a special channel structure on the membrane composed of membrane penetrating substances, which helped the passive penetration of small solutes, ions, or molecules through the membrane. It was mostly composed of protein and could be divided into ion channels and water channels. There were many research results in the field of ion channel structure biology. For example, Professor Yan Ning made important contributions to the field of ion channel structure biology. He analyzed the crystal structure of the voltage gated Na channel and used the latest cryomron microscope technology to obtain the high-resolution structure of the largest calcium channel RyR1. The opening and closing of ion channels were called gating. According to the different gating mechanisms, ion channels could be divided into three categories: 1. Voltage-gated ion channels, also known as voltage dependent or voltage sensitive ion channels, are opened and closed due to changes in membrane potential. They are named after the ions that are the easiest to pass through. There are four main types of channels, such as potassium, calcium, and calcium channels. Each type is divided into several sub-types. Voltage-gated calcium channels (VGCs) were divided into L-type, N-type, T-type, and P/Q sub-types. Different sub-types had different characteristics, such as larger L-type channel conductivity, slow activation, etc., which played a role in different tissues. The K channel was a protein complex that was widely present on the cell membrane and could pass through K ions selectively. It formed a large family of channels in terms of structure and function. It could be divided into voltage gated K channels, calcium-activated K channels, adenosine-trisphosphate sensitive K channels, etc. The voltage gated K channels could be further divided. 2. Ligand-gated ion channels, also known as chemical gated ion channels, were opened by the combination of transmitter and the binding site on the channel protein receptor molecules. They were named after transmitter receptor, such as non-selective ion channels such as the receptor channel of the receptor. 3. Mechano-gated ion channels, also known as mechanically sensitive ion channels, were a type of channel that sensed changes in cell membrane surface stress and realized the transmission of mechanical signals from the outside of the cell to the inside of the cell. They were divided into ion selective and non-ion selective channels according to their penetrability, and into tone-activated and tone-deactivated ion channels according to their functions. In addition, there were also organelle ion channels, such as the voltage dependent ion channels that were widely distributed on the outer membrane of the mitochondria in the cells of mammals, and the receptor channels located on the membrane of the sarcoplasmal reticule or the plasmatic reticule. These research results laid the foundation for the development of membrane channel structure biology and helped to understand the physiological processes such as substance transport and signal transmission in cells. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Can biological siblings be in the same organization?
It was fine for ordinary jobs, but he had to avoid key positions. Government agencies and institutions had a "evasion" policy, which was divided into three situations: regional evasion, job evasion, and official evasion. The so-called "evasion" policy mainly referred to "job evasion." When working in a key position in the same unit, if there are husband and wife, direct blood relatives, siblings, children by marriage and other relatives, they need to avoid them. Avoidance generally uses methods such as transfer. Under the condition of fully seeking their opinions and coordinating and communicating, they can adjust the unit or position to achieve the purpose of avoiding them. If they were ordinary staff or logistics staff, even if they were siblings, there was no need to avoid them. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Organization structure of anti-terrorism and riot drill
Take the anti-terrorism and riot drill in the school as an example. Its organizational structure usually consisted of a leading group: the team leader was responsible for the handling and command of the entire incident; the deputy team leader was responsible for evacuating students, communication, and other work; the members included the class teacher and other personnel. They each had different responsibilities. For example, when an incident occurred, after the school had or received a sudden safety accident, they had to command the rescue operation at the scene of the accident, and report to the relevant departments such as public security, traffic police, health, fire protection, etc. in a timely manner and request assistance. At the same time, they had to report to the education department. In line with the principle of "control first, then disposal, saving people first, and reducing losses", they should actively rescue and direct the teachers and students at the scene to leave the dangerous area, protect the school's valuables, maintain the order at the scene, do a good job in the protection of the accident scene, and do a good job in the aftermath. For the anti-terrorism and anti-riot drills of the public security department, the special patrol brigade would set up drill subjects in a scientific manner and carry out training such as anti-terrorism, anti-riot, stability, tactical training, the use of police weapons, command and dispatch, on-site negotiation, control of arrest, medical rescue, after-treatment training, etc., so as to improve the team's ability to respond quickly, handle on the spot, set up cards to block, arrest, and on-site control in anti-terrorism, anti-riot, and stability. During the drill, the members worked closely together to complete the drill objectives and accumulate actual combat experience. In addition, for example, the kindergarten anti-terrorism and riot drill will set up an anti-terrorism and riot safety leading group to formulate a detailed drill plan, and invite relevant professionals to participate in the guidance, clear the drill process and precautions and rehearse. During the drill, the personnel of each post will perform their duties according to the division of labor, such as security guards to resist criminals, teachers to organize students to evacuate, police, etc., and wait for the public security personnel to subdue the criminals after arriving. At the same time, after the drill, relevant personnel would summarize the drill and put forward suggestions for improvement. The anti-terrorism and anti-riot emergency response drill of the Ministry of Human Resources and Armed Forces was organized and carried out around on-site command, emergency dispatch, actual combat confrontation, implementation of arrest and other contents. Under the simulation scene, the duty officer found the situation and reported it in time, dealt with it in advance and issued instructions. All the personnel gathered according to the division of labor, received anti-terrorism equipment, and completed tasks such as subduing rioters and searching for them. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What content and hierarchy does the plot structure of a novel generally include?
I recommend " Light, Short, Scattered ", which is a collection of short stories written by Forget it. It was like a treasure trove with many types of stories, including science fiction, romance, horror, and so on. Each story wasn't long, and it only took a few thousand words to finish. Each chapter was basically a story, and the imagination was shocking. Some stories were good at first glance, but when one thought about it carefully, it was extremely terrifying. It was like a dark fairy tale, but it also contained the philosophy of life. One could decide whether or not to follow after reading one chapter. It was very suitable for reading when there was a book shortage or when one wanted to change their mood. In a place like Qidian, where long novels were the main focus, it was simply a refreshing stream. Although the update was a little slow, the story was really interesting. The early stages were immortal grass level, and the later stages were not bad. I strongly recommend it. " Super Fictional System " was a novel written by Furious Hair. The main character, a university student, accidentally transmigrated to the novel world through the system. However, the logic was a little messy and there were bugs. Some readers didn't like it, but there were also some who cheered for the author. " Conan: The Winery Helped Me to Get a Promotion and Raise My Pay " was a light novel about flowers blooming and the moon shining. The male protagonist sang the song and worked with the winery to improve their performance. The main character had a big imagination, but he was afraid that the plot would collapse in the later stages. However, the current plot was very exciting, but it had not been updated for more than a month. " This Superman is too much like a native " was a light novel written by Lan Li, who loved to cry. The male protagonist Luo Qiu was in a world where superpowers descended. He had superpowers like a native. Even though he had been cut off, it did not affect his reading. The content was quite enjoyable. 'The Best Actor Is Really Powerful' was an urban entertainment novel that was full of pride and ridicule. The male lead, Tidas, was very capable. These books had their own characteristics and could be chosen according to their preferences. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What does the biological structure of soil mean?
The characteristics of soil biological structure involved many aspects. First of all, the proportion of producers in the soil ecosystem was small. Algal was one of the few organisms that could photosynthesize, and most of the organic matter came from the remains of plants on the ground. The soil creatures were mutated in time and space and had a hierarchical structure. From the perspective of horizontal structure, its complexity was caused by three reasons: first, the distribution habits of parent plants, such as the different ability of wind, animal and water to spread, the weight of seeds and the way of reproduction affected the distribution of plants; The third was the interaction between species. For example, herbivores relied on the distribution of plants for food, but they were also affected by competition, mutualism, and partial symbiosis. In the aspect of latitude, from the tropics to the poles, the species richness and species richness of the biological community gradually decreased with the increase of latitude. In the aspect of altitude, the species richness of the community decreased with the increase of altitude. In the aspect of environmental grads, the species richness of the community and the environmental grads were sometimes obvious. For example, the levels of P, Mn and K in the soil were significantly related to the species richness of the tropical plant community. In the early stage of community succession, the species richness increased with the succession progress, but in the later stage, the species richness would decrease when the dominant species appeared. The microorganisms in the soil were also an important part of the soil biological structure. Different planting methods (such as crop multiplication, crop rotation, interplanting systems, etc.) would affect the status of soil microorganisms, which in turn affected soil health. Moreover, the biological structure of the soil and the non-biological characteristics of the soil (such as soil nutrients, soil structure, etc.) jointly affected the ecological function of the soil. They interacted with each other, and there was a regular replacement in the three-dimensional spatial pattern and continuity in time sequence. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What are the reasons for the differences in the structure of the biological membrane?
The reasons for the differences in the structure of the biofilms were as follows: 1. ** Function differences **: Different biofilms have different functions, which is an important reason for their structural differences. For example, the cell membrane was mainly used to separate the internal and external environment of the cell, transport substances, and transmit signals; the plasmatic reticular membrane was mainly used to synthesize protein and fat; and the mitochondria membrane was closely related to the process of oxygen breathing. In order to adapt to these different functional requirements, the composition of the membrane, the type and quantity of membrane protein, and so on would be different, resulting in structural differences. 2. ** Cell type difference **: Different types of cells have different requirements for the structure of the biological membrane. For example, plant cells have cell walls, and the structure of their cell membranes is different from the cell membranes of animal cells in some aspects. Compared with eukarytes, prokarytes have relatively simple membrane structures, which is compatible with the relatively simple physiological functions of prokarytes. 3. ** Material transportation requirements **: The cells need to transport a variety of substances, including ions, small molecules, and so on. Depending on the concentration of substances inside and outside the cell and the characteristics of the substances, the type and quantity of transport protein on the membrane would be different, which would affect the structure of the membrane. For example, if some cells needed to transport a large amount of specific ions, there would be more corresponding ion channels or ion pump on the membrane, which would change the local structure of the membrane. 4. ** Different signaling requirements **: The signaling between cells depends on the receptor protein on the biological membrane. Different cells have different response requirements for different signaling molecules, which leads to differences in the types and distribution of receptor protein on the membrane, thus affecting the structure of the membrane. 5. ** Different environments **: The environmental conditions of the cells, such as the osmic pressure and the ph, will also affect the structure of the biological membrane. For example, in a hypertonic environment, cells may adjust the structure of the cell membrane or the activity of the membrane transporter to adapt to the loss or absorption of water. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the sequence of the upstream genes of a real biological structure?
In eukaryota's structural genes, the 5'end was upstream, the 3' end was downstream, and the base number at the start site of the transcriptions of the R <anno data-annotation-id ="0000008 - 4445 - 400a-400a-80000000000"> A </anno> was 0. In the direction of the 5'end, the first base number was-1, the second base number was-2, and so on. In addition, there was a leader region upstream of the 5'end of the gene, which was equivalent to the non-coding region (untranslated region) at the 5' end of the R A. There was also a regulation region, including a initiator and an amplifier. The initiator was a DNA sequence located upstream of the 5'end of the structural gene. Eukaryotic heat shock genes had a common sequence at 15 base pairs upstream of the start point of translation. Generally, a sequence of about 2000 base pairs upstream of the gene was cloned as the initiator of the gene. The flanking sequence was also located on both sides of the gene coding region (i.e., the upstream region outside the exons), which contained the gene regulation sequence. It had an important effect on gene activity. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Seven basic biological structure knowledge points PEP edition
The following are the basic structural knowledge points of the seventh grade biology book published by the People's Education Press: ##1. Cell structure 1. ** Common structure of animal and plant cells ** - Cell membrane: Separates the substances inside the cell from the external environment, allowing the cell to have a stable internal environment. - [** Protoplasm **: A colorless, transparent, jelly-like substance located between the cell membrane and the nucleus. The protoplasm contains structures such as mitochondria.] - Nucleus: It contains genetic material and is the control center of the cell's life activities. 2. ** Unique structure of plant cells ** - ** Cell Wall **: Located on the outermost layer of plant cells, it plays a supporting and protective role. - ** Bubble **: Plant cells have a bubble, which is filled with cell fluid and dissolved with a variety of substances. The color of flowers is related to the cyanidins in the petal cell fluid. The color of cyanidins changes with the ph of the cell fluid. In young cells, the number of vesicles was small and numerous. As the cell grew, many small vesicles would combine to form a large central vesicle. - <strong></strong></strong><strong></strong> ##2. Cell Physiology 1. ** Cell Division **: The increase in the number of cells is achieved through cell division. 2. Cell growth: The process of cell size growing from small to large is called cell growth. 3. [Cell division: The result of cell division is the production of different tissues.] ##3. Temporary Filming 1. ** Steps for preparing onion skin cells for temporary mounting **:(The specific steps are not detailed, but it involves the process of collecting materials, making slices, dyeing, etc.) - In the middle of the slide, clean water was added, and the dyeing process was the process of adding an iodine-based solution. 2. ** Steps for making temporary mounting of human oral cells **:(The specific steps are not given in detail, but it involves the process of collecting materials, making films, dyeing, etc.) - Normal salt solution was dripped in the center of the slide, and the cells were scraped from the inside of the mouth with a toothpick. - Pay attention to the operation specifications when covering the cover glass to avoid bubbles, and operate correctly when staining to ensure that the cell structure can be clearly observed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>