Kneel down and ask for 20 high school biology questions

1: The chemical composition of the cell membrane is proteins and phospholipids, and a small amount of sugars.

2: mammalian mature red blood cells, because there is no nucleus, 3: put them in distilled water, let the cells burst.

4: It is a barrier effect; Through the cell membrane, the cell exchanges substances with the external environment and communicates information; Together with the nuclear membrane, organelle membrane forms the biofilm system.

5: Cellulose and pectin, support and protection.

6: Structural characteristics: fluidity; Functional characteristics: selective permeability 7: double: mitochondria and chloroplasts; Not; Ribosome, centrosome 8: lysosome.

9: chloroplasts, vacuoles.

10;Mitochondria, the main site for aerobic respiration.

11: Centrosome, which is associated with the formation of the spindle.

12: Mitochondria: converts stable chemical energy into unstable chemical energy and heat energy;

Chloroplasts: Convert light energy into unstable chemical energy, which in turn converts into stable chemical energy.

15: Kenna green dye, green.

16: It is the place where genetic material is stored and reproduced, and it is the control center of cytogenetics and metabolism.

17;Nuclear pores: channels for macromolecules to enter and exit; Nucleolus: Involved in the formation of ribosomes.

18: Protein and DNA

19: Two forms of the same substance at different times.

20: mammalian mature red blood cells, mature egg cells.

Additions to LJ2009LJ:

5. In addition to pectin and cellulose, there are teichoic acid and muramic acid, which are the cell wall components of bacteria.

Ladies and gentlemen: How did I find out that the question is a bit like a high school student's question, and the questioner gave me the feeling that he didn't want to think for himself, and then he asked for the answer on the Internet, so everyone helped him do it, and he was lazy. Huh.

I declare! Despise laziness!!

Relativity of element b: the content of the same element is different in the cells of different organisms, and there are differences in different tissues and organs of the same organism, even the content of fresh weight and dry weight in the same cell is also different.

The answer is a, because lactic acid bacteria can survive in anaerobic conditions, while several other organisms strictly need oxygen, because it is a closed environment, so the oxygen will be exhausted after a long time, and only lactic acid bacteria can survive in anaerobic conditions for a long time.

b. d. c.All three cannot live long in the case of low oxygen (death will occur after a long period of anaerobic respiration).

Only A can live normally without anaerobic breathing under anaerobic conditions. So choose A

According to the inscription, it can be seen that heterotrophic anaerobic organisms can survive without mutual interference, so only lactic acid bacteria meet . The key to this environmental condition is impermeability and the absence of sunlight, and under such conditions, only heterotrophic and anaerobic organisms can carry out normal life activities. Cabbage is autotrophic aerobic, earthworms and mushrooms are heterotrophic aerobic, and only lactic acid bacteria are heterotrophic anaerobic.

So choose a and wish you progress in your studies hehe.

Lactic acid bacteria, as the name suggests, is to produce lactic acid, only the anaerobic respiration of insufficient nutrient oxidation will produce lactic acid in (this is what you will learn in the future), generally lower organisms can survive in anaerobic conditions, that is, lactic acid bacteria! Animals and plants are aerobic respiration, mushrooms belong to fungi, I don't forget whether they are high, but they are aerobic respiration, otherwise mushrooms have to be produced under anaerobic conditions, just like lactic acid bacteria are produced in fermenters.

The answer is to choose CABCDE as the intermediate product, and they must be launched in the order of the cover, C can be launched by the B Jinting Hall as the final intermediate product, and then by D as E--C, and then A can be launched as A--E--C, and then look at C to know: the order is B--D--A--E--C

A survives in A, C, and E containing medium, while in D containing medium.

Unable to survive, and then there is the order of the above rollout: A in the D--A process of the potato disorder.

1.Viruses are a class of organisms (without cellular structure) with the main characteristics:

1) The individuals are small, and most of them must be seen only with an electron microscope.

2) Viruses that have only one nucleic acid, DNA and RNA, and no viruses that contain (two) nucleic acids.

3) Franchise (parasitic) life.

4) The structure is simple, generally composed of nucleic acids (DNA and RNA) and (proteins).

2.Depending on the host of the parasitism, viruses can be divided into three categories: (animal viruses), (plant viruses), and bacterial viruses (i.e., bacteriophages). Depending on the type of nucleic acid contained in the virus, it is divided into DNA virus and RNA virus.

Parasitic primitive simple.

Electron microscope.

One and only two.

Parasitic plant viruses, animal viruses, bacteriophages.

RNA viruses, DNA viruses.

(1) Microscope.

2) One of the two.

3) Parasitism. 4) Protein.

2.Plant viruses, animal viruses, bacteriophage DNA, RNA

1.The peptide is composed of several amino acids, of which how many glutamic acids are there?

10 amino acids.

Because there are 10 n

Glutamic acid can be listed as an equation.

4x+2(10-x)-9=19

Solve according to the number of o.

x=42.It is known that the glutamate molecule contains two carboxyl groups, so how many amino groups and how many carboxyl groups should this peptide have?

There is only 1 amino group.

at the n-terminus of the peptide chain.

5 carboxyl groups. 1 on the C-side.

4 on glutamic acid R group.

3.How many water molecules are needed to hydrolyze this peptide into amino acids?

9 because it's a 9 peptide.