The first cell to be discovered in plant single cells

Probably a cell wall structure discovered by Hooke.

) is peculiar to the plant beam and trouser tenants.

a.Cell wall.

b.Fine slag megacell membrane.

c.Cytoplasm.

d.Nucleus.

Correct Answer: a

What are the single-celled plants.

The most important feature of a single-celled plant is that it has only one cell, which is difficult to see with the naked eye. Generally, there are more algae plants, and most of them are aquatic plants. There are very few species of monophyllous plants.

Common single-celled plants are Tremor algae, Fat Chooponas, Chlamydomonas, Diatoms, and Chlorella. Font chlorella is a single-celled plant. Chlorella is spherical in shape and is only about 3-8 microns in diameter.

It reproduces quickly, has a wide distribution range, and is suitable for shallow water growth.

Chlorella. Chlamydomonas spp. It is a single-celled plant, Chlamydomonas spp. It is a swimming, single-celled plant, spherical or oval-shaped, with a smooth cell wall. Chlamydomonas spp. Prefers to live in acidic swamps.

Chlamydomonas. Diatoms are single-celled plants. The fine cell wall of diatoms has a siliceous cell wall outside the cell wall, has flagella, and can swim.

It is commonly found in temperate and tropical seas. Candida is a single-celled plant. Candida is blue-green in color and belongs to the multicellular filamentous body.

Its cells are spherical and its filaments are relatively straight. Generally, it can be harvested after the monsoon rains in summer and autumn.

In a sense, plants seem to have more flexibility than animals.

The somatic cells of plants do not need cumbersome somatic cell nuclear transfer techniques to be transformed back into fetal cells in the plant embryonic shed.

Scientists have long been using this property of the plant in Maruyama, and then using a small piece of plant tissue, they can grow seedlings in the laboratory that can be used in a forest.

But why plant cells have such flexibility, scientists have found clues such as the plant's gholimin plays a role in this process, so that a single individual cell becomes a whole plant.

The Earth was born 4.6 billion years ago. In the beginning, the earth's surface was in a molten state, and volcanic activity was particularly strong, gradually releasing a large amount of gases, mainly water vapor, hydrogen, carbon monoxide, ammonia, methane, hydrogen sulfide and other organic substances, this state of affairs has been going on for a long time, so the early stage of development of the earth has been hypoxic. A large amount of this organic matter is collected in the primeval ocean, and volcanoes, lightning and the sun's ultraviolet rays can release a large amount of energy, and under the action of these various substances, ethanol, fats, hydrocarbons, amino acids and protein-like substances are gradually formed, which are mixed together and scientists call "organic soup".

In a certain polymerization, a nucleic acid macromolecule is formed in the "organic soup". This nucleic acid molecule is capable of replicating itself. The replicated nucleic acid still carries the structural code of the maternal nucleic acid.

This code can polymerize many amino acid molecules into protein macromolecules, which form a protective membrane and accessory structure outside the nucleic acid. This is the first cell and the first life.

The evolution of life has always followed the trend from simple to complex, from low to high, and no organism has ever changed back to its ancestral type in the process of evolution. It took 3.5 billion years for life to evolve before humans appeared, during which time there were five large-scale extinctions. Every extinction is caused by the harsh changes in the living environment of living organisms.

The changes in the environment are not controlled by the power of God, and most of them are caused by activities within the Earth or other celestial bodies hitting the Earth. The development and evolution of living things are irreversible, and extinct species cannot be regenerated. From the fossils that exist in the strata, it is known that during these 3.5 billion years, no living thing has ever been able to reappear on Earth after it has been extinct for some time.

Every species living on Earth today is hard-won, and once extinct, it can never be resurrected.

The first single cell on Earth was seaweed, and the world of cyanobacteria was free of dinosaurs and fish.

The early Earth was filled with nitrogen-based organic matter, which was reacted with by electrical discharges in the atmosphere, and there were enough nutrients for life in the oceans and natural protection for life, so the first cellular organisms were born in the oceans.

Early organisms do not have cell membranes, that is, non-cellular organisms, their structure is simple, there is no relatively complete organelle structure, the morphology is like the genetic material of prokaryotes, distributed in the external environment, and the environment in which they live is freshwater, so the earliest organisms are aquatic organisms. With the further evolution of organisms, the cell structure became more and more complex, and later the cell membrane was slowly formed. Then the cellular organism is formed.

It is a single-celled organism.