A few questions about high school biology and one question about high school biology

1.Increase heat production and reduce heat dissipation, you take a serious look, isn't the body going to heat up? Only more, not less.

2.Nuclear DNA is unchanged.

5.It is the result of a free combination of genes.

6.with ferric chloride solution.

7.Bioengineered from modified E. coli.

1. No matter what the conditions, the body temperature of a normal person should be kept constant, and the heat production should be equal to the heat dissipation.

3. Bacteria are prokaryotes, and DNA is mainly in the nucleoid.

5. It is the law of gene segregation.

6. Use cells as materials, animal livers.

7. There are proteases in the pancreatic slurry, which will break down insulin.

Summary. High School Biology Topics.

Good. Hello dear, the answer to this big question has been sent to you, please look carefully at what the teacher thinks you wrote on paper.

One aa in 10,000 means that the gene frequency of a is 1 100, that is, a comes from the mother and is 1 00Target. The frequency of gene A is 99 100, the frequency of genotype of aa is 99 100*99, and the frequency of genotype is 2*99 100*1 100

One person with albinism per 10,000 people indicates that the gene frequency of a gene for a person is 1,1000, or a gene frequency of 1,100. P(a)+p(a)=1 shows that p(a)=99 100. Therefore, the square of p(aa)=(99 100) = 9801 10000, and p(aa) = 1-1 10000-9801 10000=198 10000=99 5000

DNA (base in gene): base in RNA: amino acid = 6:3:1

Because there are 120 bases in a gene fragment, there are 20 amino acids. then 20 amino acids are dehydrated at most to form 19 peptide bonds.

This won't be.,It can be seen that you don't understand.,Let's look at the basics again!

In other words, there are up to 20 amino acids, how many peptide bonds are there in 20 amino acids? 19 pcs!

If you don't understand, that's fine.

2 amino acids, a few peptide bonds, 1 ?

3 amino acids 2 peptide bonds;

And so on 20 amino acids and 19 peptide bonds!

According to the number of amino acids: the number of codons: the base number of genes = 1:

The 3:6 gene is 120 bases, so there should be 20 amino acids on the polypeptide Amino acids are linked together in a dehydrated condensation manner, and the two amino acid molecules are dehydrated to form a dipeptide, a peptide bond. And so on, 20 amino acids form a peptide chain, which will form 19 peptide bonds.

This question is the maximum number of peptide bonds, so only 20 amino acids are considered to form only one peptide chain.

double-stranded, so 120 2=60;

3 bases determine an amino acid, so 20 amino acids;

Connecting these 20 amino acids, of course, is using 19 peptide bonds

The RNA formed by transcription of DNA containing 120 bases has a maximum of 60 bases, and three bases on the RNA determine one amino acid, so the translated polypeptide chain contains up to 20 amino acids and 19 peptide bonds.

The number of peptide bonds should be the number of amino acids minus 1, for example, 3 amino acids can be connected with only 2 peptide bonds, instead of 3.

Unless it's a cyclic polypeptide, the chain is 19 peptide bonds, is there a cyclic polypeptide......?

Choose A. There are 120 amino acids in the polypeptide controlled by this gene 6 = 20, and the number of peptide bonds in the polypeptide = total number of amino acids - number of peptide chains = 20-1 = 19.

120 bases that is, there are 60 bases on each DNA strand, 60 bases are paired with the bases on the mRNA, and every three mRNA is paired with a tRNA, because the topic has the most, so the terminator is not considered, there are 20 amino acids, and the two amino acids are reduced into a peptide bond, so A

20 amino acids are dehydrated and condensed to form 19 peptide bonds.

The answer is d

It mainly involves the type of respiration of yeast (facultative anaerobic organisms), so aerobic respiration produces a lot of energy, which is mainly used to reproduce a large number of offspring, and the number of cells will increase when there is anaerobic respiration, which is what we call alcoholic fermentation - alcohol is produced!

Let's just say what I understand:

First of all, let's talk about the meaning of transformation: the process by which the target gene enters the recipient cell and maintains stability and expression in the recipient cell, which becomes transformation.

In this question, it can be simply understood that in the case of co-culture, the genes in the original mutant strain and the genes existing in the mutant strain X are "put" together.

X was cultured with J or L, and all 7 gene segments were complete. J is missing a4a5 and a6, and l is missing a4a5a6a7, then it means that these genes are all present in x, otherwise they are "combined" together, and the 7 genes cannot be complete.

Therefore, it can be concluded that X is either lacking A1A2 or A3, so that its genes can be "complementary" to J and L to become complete.

X and K or M are cultured together, and all 7 genes are not complete, either one or that is missing. where k is missing a3a4, m is missing a1a2a3a4a5, then x must be a3.

Otherwise, if X lacks A1 and M happens to have A1, the two co-culture genes are complete.

If X lacks A2, M happens to have A2, and the two are cultivated together.

So, if you want to be incomplete, X can only be missing A3.

I hope you understand

High School Biology Answers (Beijing).

You'll have to figure this out for yourself. The title tells you that it takes 1 year to sow and harvest peas. So.

The first process is the height of the stem, it takes 1 year to get F1, and it takes 1 year to get F2, but pay attention to the seeds of F2 that we get at this time, and you can't see the phenotype of his height by the seeds alone at this time, so you have to put F2 down and grow it in the spring of the third year before you can observe, but it's not 3 years.

The second process is the color and shape of the seeds, and it takes 1 year for F1 to be wrinkled with pure yellow and pure green, and 1 year for F1 self-breeding. A total of 2 years. Note that the yellow and wrinkles of the obtained seeds can not be directly observed with the naked eye? You don't have to plant it for 1 year like looking at the stems.

The height of the stem can not be observed until the F2 pea is planted and grows into a plant, so it takes 3 years; The color of the pea seed coat and the shape of the seed are all indicative of the seed, which can be observed in the seeds harvested the following year.

Green is the seed coat, the seeds must be planted, and after growing into plants, self-pollination and pods can be seen, and it takes more than a year.

The tall and short traits can only be expressed when planted in the third year, and the yellow round grains should not be planted, and the seeds in the second year can show the traits.