Biology lovers, please come in, biology lovers help

To correct it, there is no such thing as eukaryotic bacteria, prokaryotes are relative to eukaryotes, bacteria belong to the name of prokaryotes, prokaryotes also include cyanobacteria, mycoplasma, chlamydia, rickettsia, actinomycetes, etc., the name with balls, rods, arcs, spirals and other words are bacteria, eukaryotes are aimed at motokinetic and plant cells, note that yeast is eukaryotes.

Eukaryotic traits: Characteristics of eukaryotes.

The structures that prokaryotic cells are functionally equivalent to mitochondria are the plasma membrane and the structures formed by the inner folds of the plasma membrane, but the latter has neither its own unique genome nor its own unique synthesis systemEukaryotes' plants contain chloroplasts, which are also encased in a double membrane, and have their own unique genomes and synthesis systems. The electron transport system associated with photosynthetic phosphorylation is located on the lamellar formed by the inner membrane folds of chloroplasts.

Cyanobacteria and photosynthetic bacteria in prokaryotes, although they also have a membrane structure for photosynthesis, called thylakoids, are scattered in the cytoplasm and are not encapsulated by a double membrane and do not form chloroplasts. Onion cells are an example.

Prokaryotes: Prokaryotes are organisms composed of prokaryotic cells, including cyanobacteria, bacteria, archaea, actinomycetes, rickettsia, spirochetes, mycoplasma, and chlamydia.

Eukaryotic bacteria have a nucleus encapsulated in a nuclear membrane.

Prokaryotes do not have only quasi-nucleus.

Bacteria are all prokaryotes. The eukaryotic ones should be called fungi...

Apparently B, respiratory enzymes are only present in the respiratory chain of mitochondria. It's not called respiratory enzymes. It's an electronic transmitter.

Calcium is involved in the formation of action potentials, and there must be calcium.

Plasma is part of the internal environment and contains glucose and protein.

That's probably what it looks like.

Calcium ions are present in muscle tissue, and a deficiency can cause muscle twitches.

Glucose is found in almost all tissues and can provide energy.

In addition to the above, add points: |

An epidermal cell is not resistant to acids, alkalis, or high temperatures, nor can it be soaked in water for a long time.

The cells of the epidermis and even the stratum corneum will become white and even painful if they are in the water for a long time, which is one of the reasons why you cannot dive or swim for a long time.

In addition, the high temperature resistance of the hand and the mouth is relative, and there is an upper limit, which is related to its structure on the one hand, and on the other hand, it is related to the adaptation of the nerves mentioned above.

Denaturation of proteins may have occurred, but it is a protective mechanism that adapts to the instantaneous high-temperature denaturation and is degraded to produce new alternative proteins.

Finally, a lot of questions are asked before you think about it a little, and it is best to experience it, which will give you a deeper impression.

The outermost part of the epidermis has a stratum corneum.

The mouth is actually not resistant to high temperatures, you feel that it is only resistant to high temperatures, but in fact, it has been burned;

Hands are often used with thicker cuticles.

**There are several layers of tissue, the outermost layer is a layer of cuticle, the stratum corneum is a layer of dead cells, the stratum corneum you can understand as a reduced version of fish scales, but the small ones can be seen clearly with a microscope, and then there is dermal subcutaneous tissue underneath, etc. Nails are keratin ......The nails and the surface of the nails are made of keratin that is resistant to acid and alkali, and is resistant to high temperature ......

In saline, saline water is only possible when it comes into contact with living human cells, and the human body can lose ......Under normal circumstances, in addition to the stratum corneum, there is oil on the surface of the human body, and oil is a good water-sequestering substance, and salt water cannot act on the living cells of the human body, so it will naturally not lose water.

Are hands and mouths heat-resistant? Says who? Try drinking boiled water and try ......The high temperature should not mean less than 40 degrees......To correct it, it's not that it won't be denatured, but it's that it produces more than it does.

Over time, the denatured proteins outstrip the proteins produced, so the body ages.

1.Be. Acid-resistant, alkali-resistant, and high-temperature resistant is a layer of keratin, which is a dead cell, so it does not lose water in highly concentrated saline, and it does not absorb water in clean water, because its cell membrane is fully permeable.

2.The hand is resistant to high temperatures because the keratin here is thicker, the mouth is not resistant to high temperatures, you hold hot water in your mouth, and when you feel hot, the cells in your mouth are already dead. The proteins here will be denatured, but the temperature will not reach them.

1.One answer is explained, human epidermal cells are dead cells! ~

2.Depending on the selective expression of the gene, different proteins are produced.

1a glomeruli are the ones that filter the lesion so that it becomes more permeable, so the blood cells come in.

The renal tubules are responsible for reabsorption, and only part of the water and glucose are reabsorbed.

So choose A2B The oral cavity is not the respiratory system.

The larynx is not a digestive system.

So choose B

This question is too broad, "ferns" and "mosses" are big concepts, and each species has different ways. As far as I know, they are generations of sporophytes and gametophytes. If you want to know more details, you can check it out.

They are all spore plants.

They can reproduce asexually through the breakage of the protocolony.

They can also reproduce sexually through spores.

Pay attention to the difference between reproduction and reproduction.

Algae, mosses, and algae plants all reproduce their offspring with spores!

Absolutely!

1 Tooth decay.

2 This is actually a chemical problem, if you don't brush your teeth often, your mouth will be acidic, and the calcium in your teeth will react with sugar. Of course, often not brushing your teeth will also allow various bacteria to breed, and the so-called ..."Worm teeth"

3 Brush your teeth.

1 He had tooth decay.

2 Food debris ferments into acid in the teeth after a meal, eroding the enamel. So it goes black.

3 You should brush your teeth in the morning and evening, and after meals.

1 Tooth decay.

2 This is the case when food residues ferment into acid in the teeth after meals, which can also lead to the growth of various bacteria.

3 Brush your teeth in the morning and evening, rinse your mouth after meals, and maintain your teeth regularly.

The secretion of sweat glands is mainly to dissipate heat, but the secretion of sweat leads to the lack of water in the body, and the decrease of water will cause the increase of osmotic pressure in the body, so some inorganic salts will also be excreted from the body with sweat at the same time.

Because animals that live in the deep sea need to maintain their body temperature. The first characteristic of the sea compared to the river is that it is deep. Too deep at sea level to let in sunlight.

The sea temperature there is relatively low, and animals that survive in a cold environment need high calories. Therefore, most of the marine organisms (aquatic organisms) are animals with high protein content.

The fat content is very low, the reason is that this is a characteristic of aquatic organisms, in addition to large fish, and mammals marine animals will accumulate some fat in the body, the general fish fat content is relatively low. Swimming is an aerobic exercise, which is a fat-burning exercise, so the fat content in the body is not very high.

The upstairs doesn't look right

Most of the marine animals are fish, they are cold-blooded animals and do not use fat to maintain their body temperature. So comparatively speaking, they have a high protein content.

Marine mammals (such as whales, seals, otters, etc.) all need thick fat to maintain body temperature. One is because it was said upstairs that there is no sunlight 200 meters below the sea surface and the temperature is very low; In addition, the specific heat capacity of water is very high, and mammals are prone to lose body temperature in water.

Most terrestrial animals are mammals and warm-blooded animals, so they need a certain amount of fat to prevent body temperature loss, and relatively speaking, the fat content is also high.

Because marine (aquatic) organisms are mostly cold-blooded, they don't need too much fat to protect.

Stores heat, while land animals are mostly homeothermic animals.

Hehe, because animals in the water are more diligent than animals on land, they are always moving in the water, swimming around, and that's it.