What is the bond between the base and the pentose sugar in the nucleoside

Nucleosides in the base and pentose.

The junction of the is a glycosidic bond.

It consists of bases and five carbon sugars.

ribose or deoxyribose.

Compounds that are linked, that is, the N-9 of purine or the N-1 of pyrimidine and the C-1 of ribose or deoxyribose through glycosidic bonds, including ribonucleosides and deoxyribonucleosides.

Nucleosides are nitrogenous bases.

Glycosides condensed with sugar components. The original refers to nucleic acids.

The purine and pyrimidine glycosides have been extended to other natural and synthetic heterocyclic base ribosides, as well as the C1 on sugars attached to the oxygen or carbon atoms of heterocyclic bases.

on the compound.

The nucleosides that make up RNA are ribonucleosides, mainly adenosine.

Guanosine, cytidine, and uridine. The nucleosides that make up DNA are deoxyribonucleosides, mainly deoxyadenosine, deoxyguanosine, deoxycytidine, and deoxythymidine.

It is a compound formed by the condensation of a base with pentose sugar through a glycosidic bond. Ribose and bases are generally connected by -n-glycosidic bonds formed between the heterogeneous carbon of sugar and the n-1 of pyrimidines or n-9 of purines. Therefore, the bond between the sugar and the base is an N-C bond, which is generally called an N-glycosidic bond.

The D-ribose and D-2-deoxyribose in the nucleosides are furan ring structures. The C1 in the sugar ring is an asymmetric carbon atom, so there are - and - configurations. But the glycosidic bonds in the nucleic acid molecule are all -glycosidic bonds.

The application of X-ray diffraction has demonstrated that the bases in the nucleoside are perpendicular to the sugar ring plane. RNA contains rare bases, and isomerized nucleosides are also present. If there is a small amount of pseudouracil nucleoside (denoted by ) in the tRNA and rrna, the c-1 of pentose is not linked to the n-1 of uracil in its structure, but to uracil c-5.

The bases in the nucleoside are attached to the ribose sugar by CC bonds. 1.The nucleoside base and ribose sugar are connected well, and the buried joint is a glycosidic bond. It is formed by the connection of a base and a five-carbon sugar (ribose or deoxyribose), known as purines.

The N-9 or pyrimidine N-1 is linked to the C-1 of ribose or deoxyribose through glycosidic bonds, including ribonucleosides and deoxyribonucleosides.

2.Bases, also known as nucleobases and nitrogenous bases in biochemistry, are nitrogenous compounds that form nucleosides, which in turn are nucleotide friends.

components. Monomers such as bases, nucleosides, and nucleotides make up nucleic acids.

basic building blocks.

1. Phosphoric acid and ribose are connected by ester bonds, and the next nucleotide is also connected by ester bonds, so they are collectively called phosphodiester bonds.

2. The ribose sugar and the base are also dehydrated and condensed into two parts (the five-carbon sugar dehydrates the hydroxyl group, and the base dehydrogenates to form a carbon-nitrogen bond).

Phosphodiester bond and N-C glycosidic bond.

Ribose and bases are linked to nucleosides by glycosidic bonds, and nucleosides and phosphate groups are linked to nucleotides by phosphate bonds.

In the nucleotide molecule, the link between the base and the pentose sugar is () aPhosphodiester bonds.

b.Gao Sen Wang Chong can phosphorus this acid bond.

c.Glycosidic bonds.

d.Anhydride key. Correct answer: c

The chemical bond where the base and pentose are attached is a glycosidic bond.

A glycosidic bond is a chemical bond that connects a sugar (also known as a glyco) and a condensed "non-sugar" part (also known as a glycoglycone) group (also known as a glycoglycone) group between a cyclic monosaccharide hemiacetal (or hemiacetal) hydroxyl group and another molecule (such as an alcohol, sugar, purine, or pyrimidine) to form an acetal or ketobond bond, which is a chemical bond that connects sugars (also known as glycosyls) that provide a hemiacetal hydroxyl group and a "non-sugar" part (also known as a glycoaglycone) condensed with it.

The role of the bases:

A base refers to a derivative of purines and pyrimidines, which are components of nucleic acids, nucleosides, and nucleotides. The main bases of DNA and RNA are slightly different, and the important differences are: thymine is the main pyrimidine base of DNA and is extremely rare in RNA; In contrast, uracil is the main pyrimidine base of RNA and is rare in DNA.

Structure of the base:

In DNA and RNA, the part that plays a pairing role is the nitrogenous base. The 5 bases are heterocyclic compounds, and the nitrogen atom is located on the ring or on the substituted amino group, and some of them (the substituted amino group, as well as the nitrogen at the 1st position of the purine ring and the nitrogen at the 3rd position of the pyrimidine ring) are directly involved in the base pairing. There are 5 types of bases:

Cytosine (abbreviated as C), Guanine (G), Adenine (A), Thymine (T, DNA proprietary), and uracil (U, RNA proprietary).

As the name suggests, among the 5 bases, adenine and guanine belong to the purine family (abbreviated as r), and they have a double-ring structure. Cytosine, uracil, and thymine belong to the pyrimidine family (Y), and their ring system is a six-membered heterocycle. In RNA, uracil replaces the position of thymine, and it is worth noting that thymine has one more 5-position methyl group than uracil, which increases the accuracy of heredity.

The basic components of nucleosides are pentose and chain brother () cryptoculture.

a.Ribose. b.Phosphoric acid.

c.Bases. d.Nucleotide.

Correct Answer: C

Answer: The nucleotides that make up a DNA molecule are distinguished by different bases.

Explanation: DNA (deoxyribonucleic acid) is a double-stranded molecule made up of four different nucleotide units. Each nucleotide is made up of a sugar molecule, a base, and a phosphate molecule.

The base is the core part of the nucleotide and includes four types: adenine (A), guanine (G), thoracic adenine (T), and cytosine (C). The two strands of DNA are articulated to each other by hydrogen bonds between bases, with two hydrogen bonds between A and T and three hydrogen bonds between G and C. Due to the difference of the four bases, the DNA molecule has a high degree of information encoding ability and genetic stability.

Expansion: The base sequence of DNA encodes the genetic information of an organism, including body structure, physiological characteristics, metabolic function, immune system, nervous system, etc. Therefore, DNA research is of great significance for the development of life sciences and human health.

At the same time, the application of DNA technology has also been widely used in medicine, bioengineering, crime investigation and other fields.

The nucleotides that make up the DNA molecule are composed of three parts: the base group, the phosphate group, and the pentose sugar. Among them, the base is the basic unit of the DNA molecule, in which the pentose sugar plays the role of supporting and state disturbing the connecting bases, while the phosphate group links the adjacent nucleotides together to form the DNA strand.

There are four bases in a DNA molecule, namely adenine (A), guanine (G), thymine (T), and cytosine (C), and their different order and number determine the genetic information carried by the DNA molecule. Therefore, it can be said that the difference in the bases of the DNA molecule is the main factor affecting the genetic information of the DNA molecule.

The pentose sugar is the same in all nucleotides, that is, deoxyribose, therefore, the pentose of the DNA molecule is the same, and the pentose sugar is not the basis for the auspicious group division of the DNA molecule.

The nucleotides that make up the DNA molecule are structurally made up of a nucleoside containing a five-carbon sugar and a nucleotide containing a base. DNA contains 4 different bases, namely adenine (A), cytosine (C), guanine (G) and thymine (T), which are distinguished by the chemical structure of the bases.

The five carbon sugars in nucleotides are all deoxyribose, that is, pentose. Deoxyribose combines with the bases in the nucleotide as well as the phosphate group to form the nucleotide molecule, which is one of the three important units that make up the DNA molecule. Therefore, although the nucleotides contain the same pentose structure, through the different arrangement of the bases, it is possible to form countless traces of different DNA sequences, thus encoding all the genetic information within the organism. Brother filial piety.

Answer: The difference between nucleophonic acids is that the bases are different.

Explanation: The DNA molecule is made up of four nucleophonic acids: adenine (A), guanine (G), thymine (T), and cytosine (C).

The bases in these four nuclear acids are different, and pentose is their common component. The different arrangement of the bases determines the genetic information of the DNA molecule.

Expansion: The RNA molecule is also composed of nucleophonic acids, but it contains only three companion bases: adenine, guanine, and thymine, while cytosine is replaced by uracil (U).

The main function of RNA is to transcribe the genetic information in DNA into proteins, so it needs to be paired with DNA in the process of reed-type sublease plexing, and the base pairing between you and T is different from A.

The nucleotides that make up the DNA molecule are distinguished by their bases. Each nucleotide contains a pentose molecule, a phosphate molecule, and a reciprocal base. The molecular structure of the bases is different, including four types: adenine, guanine, thymine, and trout leakage.

These different bases pair with each other in different ways by hydrogen bonding to form the double helix structure of DNA. This structure is an important basis for the transmission of genetic information and protein synthesis in organisms.

The DNA molecule is made up of four different nucleotides, including: adenine (A), guanine (G), thymine (T), and cytosine (C). Each nucleoside sung acid is made up of three parts:

A phosphate group, a pentose sugar (also known as deoxyribose), and a nitrogen base. Thus, the nucleotide region includes both base differences and pentose differences. Different base pairings and sequences determine the genetic information carried in the DNA.