Weakly ask a high creature...

Metaphase chromosomes are neatly arranged on the equatorial plate.

Option D analysis: There are only 20 amino acids that make up proteins, and it is impossible to have more.

1) Processes 1 and 2 show that polymorphic sugars and proteins of S-type bacteria are mixed with R-type bacteria, and their progeny are R-type bacteria.

2) Process 3 shows that the DNA of type S bacteria is mixed with live bacteria of type R, and type R bacteria are transformed into type S bacteria.

3) Process 4 showed that the offspring of the transformed S-type bacteria were also virulent S-type bacteria. Mountain Book.

1) Polysaccharide protein r

2)dna r s

3)s toxic s

This is a very simple problem of separation and combination, which is quite a simple lease for Wang Youhong. After careful analysis, most people will make a difficult book. Unless you're at primary school level.

First of all, A is deoxyribonucleic acid, A is DNA, X is RNA, B is an amino acid, B is a protein, Y is a chromosome, and B1, B2, and B3 are three proteins with different functions: immune protein, enzyme (protein), and hemoglobin.

1: Transcriptase.

2: Within the mitochondria, in the cytoplasmic matrix.

3: There are many kinds of amino acids that make up proteins; The spatial structure of proteins varies4: Yes, the genetic material is the same.

5: chromosome, 1; 2

6: peptide chain, 3m+3 (terminator does not translate protein).

I don't know if I can see it clearly.

A C with a carboxyl group Cooh with an amino group NH2 and an H group is the last position of the R group A

A is due to the fact that the R group is out, and the remaining part is a tetrahedral C atom, connecting an H side group, a CoO-side group, and an NH4+ side group!

Pick A!! With the law of separation and the law of free combination.

AA's can be composed of four sub-generations: AA, AA, AA, and AA.

AA can be composed of AA, AA, AA, AA four offspring, and the ratio of the number of pea seeds of AA and AA is 1:2, that is, the ratio of the number of seeds in the generation of genetic factors is AA, AA, and AA is 3:2:1, right.

According to the laws of heredity, choose D

There are 98 peptide bonds and 2 peptide chains, indicating that 100 amino acids have undergone 98 dehydration condensations during the synthesis of this protein. Removed 98 and water molecules.

The relative molecular mass of the water molecule is 18

So the relative molecular weight of the protein = 128*100 - (98*18) = 11036 gives you a formula: protein relative molecular weight = relative molecular weight of amino acids * (number of peptide bonds + number of peptide chains) - (relative molecular weight of water molecules * number of peptide bonds).

cProtein mass = total amino acid mass - dehydrated mass.

Number of water = number of peptide bonds.

Number of amino acids = number of peptide bonds + number of peptide chains.

The average relative molecular weight is 128, composed of two polypeptide chains, with a total of 98 peptide bonds, that is, there are 98 + 2 = 100 amino acids and 98 peptide bonds, that is, 98 water molecules are removed when formed, and the mass of water molecules is 18, so the total mass is about the mass of all amino acids minus the mass of dehydration, that is, 128*100-18*98=11036 The answer is c

Glycine CH-Cooh

NH2 alanine CH3-CH-COOH

NH21, glycine-cooh binds to -NH2 of alanine2, -NH2 of glycine binds to -COOH of alanine3, -COOH of glycine binds to -NH2 of glycine4, and -cooh of alanine binds to -NH2 of alanine.

One is glycine providing amino groups to form peptide bonds, and the other is glycine providing carboxyl groups forming peptide bonds.

To put it simply, there are two types of amino acids.

Four kinds, Glycine & Glycine, Alanine & Alanine, Glycine Decarboxylation, Alanine Deamination, Alanine Decarboxylation, Glycine Deamination.

The amino and carboxyl groups of the 4 two amino acids can be dehydrated and condensed with each other to form peptide bonds. That is, the carboxyl group of glycine and the amino group of alanine, the amino group of glycine and the carboxyl group of alanine, the amino group of glycine and the carboxyl group of another glycine, the amino group of alanine and the carboxyl group of another alanine.