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Anonymous users2024-02-121. The sampler sampling method is a sampling method used to investigate the types of soil small animals;
2. Visual estimation method and named statistics method are the methods of specific counting when investigating soil small animals. One is accurate and one is blurry;
3. Microscopic counting is a method of observing and calculating the number of microorganisms under a microscope;
4. The dilution coating plate method is a method to calculate the number of bacteria and other microorganisms by using the method of forming colonies on the medium after dilution.
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Anonymous users2024-02-11High School BiologyThere are 5 notations.
1. Sampler sampling method
The sampler sampling method is used to investigate the species of soil small animals; The sampler sampling method is suitable for small animals, such as earthworms, etc.; The method is suitable for plants and animals with low mobility.
2. Visual estimation method and notationStatistical Law
The visual estimation method and the named statistics method are the methods for specific counting when investigating soil small animals, and the named statistics method is more accurate, and the visual estimation method is fuzzy.
3. Microscopic counting
Microcounting is a method of observing and counting the number of microorganisms under a microscope.
4. Dilution coating plate method
The dilution coating plate method is used after dilution in the medium.
A method of counting the number of microorganisms such as bacteria on the method of forming colonies.
Uses of cell counting:
Cytometry is a method used to count the number of cells in a cell suspension, typically using a count plate (hemocytometer.
Carry out. It can be used for isolated cell culture.
Counting the number of cells in the prepared cell suspension before seeding can also be used to count the number of cells in culture. Regardless of the object being counted, a dispersed cell suspension is prepared.
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Anonymous users2024-02-101. The sampler sampling method is a sampling method used to investigate the types of soil small animals;
2. Visual estimation method and named statistics method are the methods of specific counting when investigating soil small animals. One is accurate and one is blurry;
3. Microscopic counting is a method of observing and calculating the number of microorganisms under a microscope;
4. The dilution coating plate method is a method to calculate the number of bacteria and other microorganisms by using the method of forming colonies on the medium after dilution.
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Anonymous users2024-02-09Summary. Hello dear, I am glad to answer for you that there are 5 counting methods for high school biology 1, sampler sampling method, sampler sampling method is used to investigate the sampling method of soil small animal species; The sampler sampling method is suitable for small animals, such as earthworms, etc.; The method is suitable for plants and animals with low mobility. 2. Visual estimation method and named statistics methodVisual estimation method and named statistics method are the specific counting methods when investigating soil small animals, and the named statistics method is more accurate, and the visual estimation method is fuzzy.
Hello dear, I am glad to answer your question for Que Chun that there are 5 suspicious years of high school biology counting method 1, sampler sampling method sampler sampling method is used to investigate the species of soil small animals; The sampler sampling method is suitable for small animals, such as earthworms, etc.; The method is suitable for plants and animals with weak mobility. 2. Visual estimation method and named statistics methodVisual estimation method and named statistics method are the specific counting methods when investigating soil small animals, and the named statistics method is more accurate, and the visual estimation method is fuzzy.
3. MicrocountingMicrocountingMicrocountingMicrocounting, which is a method to observe and calculate the number of microorganisms under a microscope. 4. Dilution coating plate method The dilution coating plate method is a method to calculate the number of bacteria and other microorganisms by means of using the method of forming colonies on the nutrient base of the cultivation hall after dilution 5. The use of cell counting method: Cell counting method is a method used to count the number of cells in cell suspension, which is generally carried out by using a counting plate (xue ball counting plate).
It can be used to count the number of cells in the prepared cell suspension before cell culture seeding, and to count the number of cells in culture. Regardless of the object being counted, a cell suspension with only comaca dispersion is prepared.
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Anonymous users2024-02-08Content from user: Wei Jingru.
High School Biology Calculation Formula Induction.
a) Calculations related to proteins and nucleic acids: [Note: number of peptide chains (m); Total number of amino acids (n); Average molecular weight of amino acids (a); Average molecular weight of amino acids (b); Total number of nucleotides (c); Mean molecular weight of nucleotides (d)].
1 Protein (and polypeptide): amino acids are dehydrated and condensed to form polypeptides, and the mass of various elements is conserved, of which H and O participate in dehydration. Each amino acid has at least 1 amino group and 1 carboxyl group, and the excess amino and carboxyl groups are derived from the R group.
Calculation of the number of each atom of amino acids: the number of c atoms and the number of c atoms on the r base 2;H atomic number R Atomic number on the R base 4;o Atomic number O Atomic number on r basis 2;Number of n atoms Number of n atoms on the basis of r 1.
At least 1 free amino and 1 carboxyl group per peptide chain; m peptide chain protein free amino and carboxyl groups at least: m each; Number of peptide bonds, number of dehydration (number of water gained and lost), number of amino acids, number of peptide chains, n—m;
Protein is composed of m polypeptide chains: total number of n atoms, total number of peptide bonds, m ammonia number (end), ammonia base on r group;
Total number of peptide bonds Total number of amino groups Total number of peptide bonds m number of amino groups (ends);
o Total number of atoms Total number of peptide bonds 2 (m carboxyl base (end) carboxyl base on r group);
Total number of peptide bonds 2 Total number of carboxyl groups Total number of peptide bonds 2m carboxyl number (end);
Protein molecular weight Total molecular weight of amino acids—total molecular weight of dehydration (total atomic weight of dehydrogenation) na—18(n—m); 2 Calculation of the number of amino acids in protein and the number of bases in double-stranded DNA (gene) and mRNA:
Base number of DNA genes (at least): Number of bases of mRNA (at least): The number of amino acids in a protein
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Anonymous users2024-02-071.Calculations on the condensation reaction of amino acids.
From the dehydration and condensation of amino acid molecules, it can be seen that every peptide bond formed during the protein formation process loses one molecule of water at the same time, that is, the number of peptide bonds formed = the number of molecules lost.
2.Calculations about the molecular weight of proteins.
Protein relative molecular weight = sum of relative molecular weight of amino acids – loss of the sum of the relative molecular weight of water molecules.
3.Calculation of the number of peptide bonds in a protein.
The number of peptide bonds (or the number of water molecules removed) = the number of amino acids - the number of peptide chains in Anhui, it seems that only proteins need to be calculated.
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Anonymous users2024-02-06Peptide chain: a chain-like structure of a compound containing multiple peptide tendons formed by the dehydration and condensation of multiple amino acid moleculesPeptide tendon: the bond that connects two amino acid molecules is dehydrated, the number of molecules = the number of peptide bonds = the number of amino acids - the number of peptide chains, the relative molecular weight of protein molecules = the average molecular weight of amino acids The number of amino acids - the number of dehydration 18 On a peptide chain:
There are at least 1 amino group and 1 carboxyl group.
Number of dehydrations = number of peptide chains = number of amino acids - 1m on peptide chains:
There are at least m amino groups and m carboxyl groups.
Number of dehydrations = number of peptide chains = number of amino acids-m
Synthesis of proteins requires certain enzymes, and the composition of ribosomes requires certain structural proteins, so it has proteins; In addition, ribosomal RNA: that is, RRNA, is the most abundant class of RNA, and it is also the largest class of RNA with the largest relative molecular mass among the 3 types of RNA (tRNA, mRNA, RRNA), which combines with proteins to form ribosomes, and its function is to act as a scaffold for mRNA, so that mRNA molecules can be on it, to achieve protein synthesis, for the integrity of the function, he must have RNA.
First, the dominant recessive nature of albinism and sickle anemia was determined, and according to the left half of Figure 1, it can be concluded that anemia is a recessive genetic disease, which is bb; Then look at Figure 2, because if it is normal, it can be cut, and if it is not normal, it can't, so B is normal, C is albino, and both are homozygous, only A is heterozygous (because A can cut out three pieces: DNA is a double helix structure, only one of A can be cut, B can be cut all of them, cut into two short and two long, C is not cut) Because albinism is a recessive genetic disease, it is AA, so it can be known that B is AA and C is AA >>>More
Dizzy, buy a reference book.
There are different classification methods according to their chemical properties, production sites, physiological effects, etc. >>>More
In fact, you don't have to be so nervous, you may just put too much pressure on yourself, relax, and the workbook or something wrong is a good thing, learn more lessons, don't miss it again, and the review before the exam is very important, I usually look at the notes, and then see that I am not very familiar with the will be memorized, and then 5.3 wrong questions to see more, but there is no need to do 5.3 in the second year of high school, you can try my method, maybe it will get better.