Is the DNA molecule the same for the same organism?

I feel like LZ is asking about the same organisms and not the same organisms, like two twins, their DNA certainly can't be 100% identical.

But the DNA of the same species must be very similar, in fact, the distance between individual species can be determined according to the degree of DNA homology, and even family maps can be made.

RNA, because it is transcribed from DNA, is directly determined by the similarities and differences of DNA on the one hand, and by the regulation of DNA transcription on the other hand, that is, by the state of the cell.

The DNA molecules are 100% the same in different cells of the same organism because they all develop from a fertilized egg.

In the absence of gene mutations, the DNA molecules of cells of the same organisms may be different, and the selective expression of genes in different somatic cells is different.

It's all the same, but the reality shows that the traits are different, because the expression of genes is affected by the environment.

Gene mutations are not considered, the same in somatic cells, not the same in germ cells, RNA is not different in different cells, and the selective expression of genes is considered.

Biological macromolecules refer to macromolecules such as proteins, nucleic acids, and polysaccharides that exist in the cells of living organisms. Each biological macromolecule has thousands to hundreds of thousands of atoms in it, and the molecular weight ranges from tens of thousands to millions or more.

The structure of biological macromolecules is complex, but its basic building blocks are not. A protein molecule is a long chain of amino acid molecules arranged in a certain order. Amino acid molecules are the constituent materials of most living substances, and there are dozens of different amino acid molecules.

The vast majority of enzymes in living organisms belong to proteins, which are indispensable for organisms to maintain normal metabolic functions.

Yes protein. Nucleic acid. Polysaccharide. for biological macromolecules.

Fats are not biological macromolecules.

Fat is not a macromolecule, macromolecule needs to be composed of monomers, and fats do not have special monomers.

No, fats are not biological macromolecules.

First of all, it should be clarified that organisms include organisms with cellular structures and organisms without cellular structures.

Organisms with cellular structures must have DNA in their bodies, but organisms without cellular structures (referring to viruses) have DNA and some do not. These organisms are made up of nucleic acids and protein shells, but contain only one type of nucleic acid, either DNA or RNA. If this nucleic acid is RNA, then the body must be free of DNA, such as tobacco mosaic virus, hepatitis B virus, influenza virus, avian influenza virus, HIV virus, SARS virus, measles virus, polio virus, etc., which do not contain DNA.

Different tissue cells of the same organism are developed from a fertilized egg, and the DNA in the cells is the same, but due to the selective expression of genes, the RNA in different cells is different, wrong;

After cell differentiation, genes are selectively expressed, so the types and quantities of genes expressed in cells of different tissues of the same organism are generally different, correct;

Cyanobacteria are prokaryotic cells that do not contain centrosomes and chloroplasts, false;

An organism contains 4 sets of chromosomes in its cells, and the organism is not necessarily tetraploid, but may also be haploid, false;

The messenger RNA has codons on it that determine amino acids, wrong

DNA is a biological macromolecule, which is composed of four deoxynucleotide molecules in a certain number and order, and is a long chain molecule;

A gene is a fragment of a DNA molecule that has specific genetic effects. There are many genes on one DNA molecule.

Genes are just pieces of DNA.

DNA and genes are not involved in the same concept.

Deoxyribonucleic acid (DNA, abbreviation for deoxyribonucleic acid), also known as deoxyribonucleic acid, is the main chemical component of chromosomes and is also the material that makes up genes.

A gene is a general term for a specific nucleotide sequence on a DNA molecule that has a genetic effect, and is a fragment of a DNA molecule that has a genetic effect.

So it can be said that genes are part of DNA.