The scientific method involved in high school biology compulsory 123

Hypothetical deductive method.

Analogical reasoning.

High School Biology Compulsory 123 Summary Views: 24 Reward Points: 0

Well, if you don't do it, it is recommended not to write. It's a waste of time. Deceive others as well as deceive yourself.

It's a big deal, let the teacher say a few words to you for his own face. Don't be afraid of what the teacher says about you, be thick-skinned. If you want to write, write it yourself.

You can write less, you can write more. Think for yourself. Finally, Happy New Year.

I wish you success in your studies.

b. Plants contain a large amount of K, which leads to a large amount of K in our herbivorous foods;

Through the relationship of the food chain, our various carnivorous foods also contain a large amount of K;

Because of 1 and 2, we can get enough K from food every day;

Everyone must know that the chemical elements that make up plants contain a lot of K, and the textbooks do not say whether or not they contain Na or how much Na they contain. You can imagine that the amount of Na in plants is many times less than that of K;

The amount of Na in our herbivorous and carnivorous foods is much lower than that of K;

Therefore, it is NA that we tend to lack, not K

When the outside temperature is low, the human body relies on the strengthening of metabolism to maintain body temperature, such as shivering, etc., and always maintains the temperature level of the human body's internal environment. That's why people can also be called thermostatic animals.

Question 1a, because sodium salt belongs to eating more and eliminating more, eating less and eliminating less, and not eating and not excreting. Potassium salt belongs to eating more and excreting more, eating less and excreting less, and excreting without eating. Therefore, when the patient is unable to eat, potassium salt should be supplemented.

Question 2b, pay attention to the topic and strengthen metabolism. There needs to be neurohumoral regulation, and that's only hypothermia. You can look up the textbook, there is an example of this.

Formation of resting potential:

At normal times, there are positive ions K+ and organic negative ions A- in the membrane, and there is a high concentration of Na+ and Cl- outside the membrane (higher than the concentration of ions in the membrane), at this time, the ions in the membrane have a tendency to expand outward, and the ions outside the membrane also have a tendency to expand inward, and the permeability of the cell membrane to ions is different when it is quiet, (the permeability of K+ is much greater than that of Na+ and Cl-, and the permeability of organic ions A- in the membrane is smaller than that of ions outside the membrane, and its permeability can almost be ignored) so K+ continues to flow outside the membrane. The positive ions outside the membrane increase, and there are only organic negative ions A- and a very small amount of Na+ and a very small amount of Cl- ions in the membrane, so it causes the cell membrane to become negative and the membrane to become positive, which forms a potential difference, the potential difference will prevent the flow of k+ ions to the outside of the membrane, the more k+ ions flow out, the greater the potential difference between the blocking potential, when the k+ ions flow outside the membrane to a certain extent, the potential difference between the potential to prevent the outflow and the potential difference formed by the outflow will be equal (to reach a certain equilibrium), at this time k+The outward and intramembrane flow of ions in the cell membrane is equal, which is the resting potential! (I feel that it is a little difficult to understand in text language, you can compare the picture and the text by yourself and slowly understand it, I can only help you get here(.)

1(a) This influenza virus has a protein outer shell and an inner RNA that enters the cell entirely.

b) Virus entering cells can only be cleared after effector T cells lyse the host cell to release the virus.

c) According to the central rule.

In RNA viruses, some reproduce by reverse transcription of RNA, and some by + - RNA.

d) Read books on your own.

2(b) Cells have a similar elemental composition, a similar structure (all have membranes and similar compositions), and all have genetic material (DNA and RNA).

d) Ibid. 3.If you look at the question again, are you sure it's the quantity and not the content? If it is content (mass percentage), it is を the most.

4.It is not necessary to have only one amino group or one carboxyl group, the basic structure is to connect one amino group to the same carbon, but the R group may still contain an amino group or a carboxyl group.

5.The biuret reaction occurs only in the presence of peptide bonds (quoting the answer of netizens: biuret is a compound formed by the condensation of two molecules of urea, and when the urea is heated to 180 degrees, the two molecules of urea are condensed into one molecule of biurea, and a molecule of ammonia is released.

Diuret can react with copper sulfate in alkaline solution to produce reddish-purple complexes, which is called diuret reaction. Protein molecules contain many peptide bonds that are structurally similar to biuret, so they can also react with biuret to form reddish-purple complexes. ）

It is formed by bending a strand of RNA, and the hydrogen bonds formed are the way to maintain the shape.

7.Prokaryotes, without nucleus, DNA within the cytoplasm.

8.It is a lipid but not a fat.

9.The metabolic center of the cell is the cytoplasmic matrix (the cytoplasmic matrix is the main site of metabolism), and the nucleus is the control center of heredity and metabolism.

10.The nuclear pore is selectively permeable.

I'll ...... again tomorrow