Ask a senior biology question textbook .

Hello: Osmotic pressure is caused by the concentration of extracellular fluid versus intracellular fluid.

First of all, it should be explained that sodium salts and other substances enter and exit cells through active transport, and people do not drink enough water, lose too much water in the body, or eat too salty food, which will cause the concentration of extracellular fluid to increase, and on the contrary, the concentration of intracellular fluid will decrease, resulting in an increase in extracellular fluid osmotic pressure.

Working in high temperatures, exercising vigorously or suffering from certain diseases – we know that sweat is salty and salty, but where does this salt come from? - Extracellular: Because sodium salts are mostly actively transported in the cell, sweating, violent vomiting, and severe diarrhea will bring out sodium salts, etc., which will cause the concentration of extracellular fluid to decrease, and the concentration of intracellular fluid to increase - the osmotic pressure of extracellular fluid to decrease.

Note: Active transport requires energy and a carrier so sweating does not cause intracellular salt loss. ~

I just took the college entrance exam. I think the creatures are okay. Osmotic pressure is caused by the difference in concentration between extracellular and intracellular pressure, and excessive sweating or insufficient drinking will reduce the amount of water in the body, and the osmotic pressure of the cells will increase.

Inorganic salts need to be supplemented. When vomiting or diarrhea, the body will lose a large amount of inorganic salts, the osmotic pressure will decrease, and if it is not replenished in time, the human body will collapse.

loss of a large amount of water and inorganic salts (mainly sodium salts)" is actually the main reason for the loss of inorganic salts, but it is felt that the osmotic pressure of the extracellular fluid should rise after "working under high temperature conditions and exercising vigorously", so people will feel thirsty.

You notice that the difference between the two is that 1 is not drinking enough water, not sweating, not excreting inorganic salts.

2. In addition to the water elimination, there is also the discharge of inorganic salts, which is the key.

Summary. Ecological soaking refers to soaking seeds with lime water instead of organic chemicals. Organic chemicals can affect human health through the chemicals remaining on the surface of the seeds into the food chain, while lime water can also play a bactericidal role and kill most microorganisms on the surface of the seeds.

Ecological soaking refers to the use of stone transportation and gray water instead of organic chemical soaking. Organic chemicals may affect human health through the chemical compounding substances left on the surface of the seeds into the food chain, and lime water can also play a bactericidal role and kill most of the microscopic particles on the surface of the seeds.

I mean, you can just write me these empty answers.

The above paragraph is filled in the blank.

Chemicals left on the surface of the seeds enter the food chain through bactericidal effects.

Chemical transport energy.

Environment. 1) Spore filter sterilization or radiation sterilization.

2) Central nervous system in the direction of reproduction.

3) Cryopreservation of in vitro fertilization or somatic cell nuclear transfer.

Nope. If you have any questions in the future, you can continue to consult the teacher.

Because its genes have not changed substantially.

Because it also has messenger DNA in it

Choose A. The explanation is as follows:

Option A: Ribosomes are the place where proteins are synthesized, they do not synthesize amino acids, so A is wrong;

Option B: According to the title, glycine can cause potential changes in the postsynaptic membrane, so it is a neurotransmitter, so B is correct;

Option C: Neurotransmitters are released in exocytosis, and glycine is a neurotransmitter, so its release is also achieved through exocytosis, so C is correct;

Option d: Glycine opens the chloride channel, causing the chloride to flow inward, and the positive potential outside the membrane increases. This means that the resting potential is strengthened, so the more difficult it is to produce excitation, which is the mechanism of action that inhibits the excitation of the postsynaptic membrane, so d is correct.

Analysis: According to the title, CL influx can make the extramembrane potential of the postsynaptic membrane higher, indicating that the resting potential is strengthened, and it is more difficult for the next neuron to produce excitability, even if the next neuron is inhibited. Glycine belongs to neurotransmitters, and the way neurotransmitters are released is exocytosis.

Answer: I hope it can help you.

Glycine is an amino acid, and ribosomes synthesize polypeptide chains, so a is not right.

Because neurotransmitters are divided into inhibitory and excitatory types, the potential inside and outside the membrane is changed from negative inside and outside to positive inside and outside, which is excitatory and vice versa, so B and D are correct.

The neurotransmitters are endocytocytosis so c is correct.

A and D glycine shouldn't be synthesized on ribosomes, right? It can be converted from glucose. What is wrong is that excitement is not inhibition.

I feel that AD is wrong, what should I do? It seems to be a suppression type when I see it. To show you that in the central nervous system, especially in the spine, glycine is an inhibitory neurotransmitter.

If the glycine receptor is activated, chloride ions enter the nerve cell through the ion receptor, resulting in inhibitory postsynaptic potentials. Choose A.

The nervous system is indirectly linked to the internal environment, for example by controlling the release of certain hormones.

The impact of other systems on the internal environment.

Inorganic salt ions flow in the extracellular fluid mainly in the form of diffusion, so there is little difference in concentration. Proteins are macromolecules, and the protein content of intracellular fluid is much greater than that of tissue fluid (e.g., enzymes).

1.Among the following biological systems, which are not directly related to the maintenance of homeostasis, (a) aDigestive system B

Circulatory system cUrinary system DNervous system 2

The group with the largest difference in electrolyte concentrations among the following different types of body fluids is (c)aBicarbonate ions in plasma and tissue fluid bChloride c. of plasma and tissue fluid

Proteins of interstitial fluid versus intracellular fluid dSodium ions in tissue fluid and lymphatic fluid.

If you are present, it means that it is mitochondria, ribosomes, nucleus, chloroplasts.

Because it is the root tip, the chloroplast can be removed.

There are both you and t, so the ribosomes are removed.

A is photosynthesis, there is no chloroplast so it cannot be carried out, wrong.

B mitochondria contain ribosomes, so they can be transcribed and translated by themselves.

c Aerobic respiration. Mitochondria can be done, but its first step is in the cytosol, wrong.

d Fermentation (anaerobic respiration), which occurs in the cytosol, is wrong.

b said that it is an organelle By looking at the bases, it is found that there are both t and u, indicating that the cell phase is mitochondria or chloroplasts.

A occurs only in chloroplasts and apical cells do not have chloroplasts, c occurs only in ** chondra , d occurs in the cytoplasmic matrix b ** DNA in both the chondria and chloroplasts can be transcribed and translated in this organelle by themselves.

Select B analysis: A, it should be a dominant mutation, from AA to AA, if it is a recessive mutation, from AA to AA, then its phenotype will not change;

b, the mutated genotype is AA, and the homozygous individuals who can produce AA after inbreeding;

c, observing the chromosome morphology cannot see the location of genes;

d, the pollen-chondrial culture obtained is haploid, will not be high-yielding, and must be treated with colchicine to obtain stable genetic high-yielding lines.

I think it's BA, and the phenotype may be from AA mutation to AA

C is impossible to see.

d, after in vitro culture, it is haploid, and the chromosomes should be doubled first.

Uracil ribonucleotide is a component of RNA, so it has nothing to do with DNA replication, A, D is wrong; And because of the "presumed closely related process", uracil ribonucleotide is used in transcription, and although mRNA is involved in translation, it is due to transcription that causes radioactivity on the mucosal layer of the 'whole' small intestine.

Hope it helps!

B transcription, uracil ribonucleotide is a component of RNA, and the raw material used for DNA replication is uracil deoxynucleotide.