How to understand that there is a cellular structure that does not mean that it is a living body?

Organisms are divided into viruses and cells according to the presence or absence of cellular structure.

With the exception of a few species such as viruses, living organisms are made up of cells;

Organisms all have a metabolic role;

Organisms all have growth phenomena;

Organisms are contingency;

Organisms are capable of reproduction and development;

Organisms have both genetic and mutated properties;

Organisms can adapt to a certain environment and can also affect the environment.

The presence of a cell structure does not mean that it is a living organism and cannot be a dead cell.

If it is a cellular structure on a fossil, of course, it cannot be considered a living organism.

It depends on whether there are the basic characteristics of a living organism

1. Organisms have a common material and structural basis.

2. Organisms have metabolic effects.

3. Organisms are stressful.

4. Organisms have the phenomenon of growth, development and reproduction.

5. Organisms have genetic and mutated characteristics.

6. Organisms can adapt to a certain environment (including biological and abiotic factors), and can also affect the environment.

Living organisms are made up of cells. Cells are the basic units of living organisms, and they are the smallest functional units in living bodies. Cells contain a variety of different organs, such as the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, etc., which work together to enable the cell to complete various life activities.

In living organisms, different types of cells have different forms and functions. For example, muscle cells can contract, nerve cells can transmit messages, blood cells can carry oxygen and nutrients, and immune cells can recognize and attack invading pathogens.

The life activities of cells are made up of various chemical reactions and signaling processes. Within the cell, various proteins, nucleic acids, and other biomolecules are involved in these reactions and delivery processes. The normal progression of these processes is essential for the survival and reproduction of cells.

Cells not only play an important role in life, they are also the basis for the origin and development of life. The origins of life can be traced back billions of years to primitive single-celled organisms, which evolved over a long period of time to develop a variety of different cell types to form the diverse organisms we know today.

In general, cells are the most basic building blocks of living organisms, and their morphology, careful structure, and function are essential for the survival and reproduction of living organisms. Understanding the structure and function of cells is of great significance for us to delve into the mysteries of life and the process of evolution.

This involves a high level of attack on the question of cellular totipotency.

Plant cells are totipotent and animal nuclei are totipotent (except embryonic cells).Totipotency has two meanings: one is that it can develop into a complete individual, and the other is that it has all the genetic information of the organism.

As mentioned above, for individual animals, only the fertilized egg has totipotency, and the existence of this totipotency is largely due to the presence of protein factors in the cytoplasm of the egg cell that can guide the expression of genes in the nucleus.

In addition, highly differentiated somatic spikes also produce enzymes that inhibit the expression of other base conjecture tardinations. Therefore, it is impossible to culture the somatic cells of animals into new individuals, but the nucleus of somatic cells can be implanted into enucleated egg cells to grow into complete individuals. This is also the general principle of cloning technology.

All life is built on the basis of cells. For single-celled organisms, the cell is its organism itself, for multicellular organisms, the cell is the basic unit that performs its life activities, and for some organisms without a cellular structure, they can only reproduce offspring and show life characteristics by parasitic inside the cell.

Everyone knows that the largest ecosystem in the world is the biosphere, and the most basic living system on earth is the cell. So why is that? Let's talk about why cells are the most basic living system.

01 Because all life is built on the basis of cells. For single-celled organisms, the cell is its organism itself, for multicellular organisms, the cell is the basic unit that performs its life activities, and for some organisms without a cellular structure, they can only reproduce offspring and show life characteristics by parasitic inside the cell. Therefore, cells are the most basic living system.

02 There is no universal definition of cell, and the more common formulation is that cell is the basic structural and functional unit of living organisms. It is known that all organisms except viruses are composed of cells, but the life activities of viruses must also be reflected in cells.

03 Generally speaking, most microorganisms such as bacteria and protozoa are composed of a single cell, that is, single-celled organisms, while higher plants and higher animals are multicellular organisms. Cells can be divided into two categories: prokaryotic cells and eukaryotic cells, but some people have proposed that they should be divided into three categories, that is, the ancient karyotic cells that originally belonged to prokaryotic cells should be separated as a parallel category. The discipline that studies cells is called cell biology.

04 Cells are so small that they can be seen under a microscope and come in a variety of shapes. It is mainly composed of the nucleus and cytoplasm, and has a cell membrane on the surface. Higher plants have a cell wall outside the cell membrane, plastids in the cytoplasm, chloroplasts and vacuoles in the body, and mitochondria.

Animal cells do not have a cell wall, and centrosomes are often present in the cytoplasm, while higher plant cells do not. Cells have functions such as locomotion, nutrition, and reproduction.

If the essence of life is the cell, then the difference between the filial branch and the non-cell of the skillful chain sensitive cell is ().

a.Is there a Calling Core.

b.Whether also mitochondria.

c.Whether there is a cell membrane or not.

d.Whether there is energy or not.

Correct answer: c