A structure formed by a covalent bond between a nitrogenous base and a pentose sugar is called

Q: Which of the following is a purine that forms 3 hydrogen bonds with its complementary base? (a) A…

A: Nucleic acids were first discovered by Miescher while studying the pus cells discarded from the…

Q: Which of the following are nitrogenous bases with the general structure shown in the picture?…

A: The nitrogenous base shown in the picture contains a bi cyclic ring which indicates that it is a…

Q: O-linked oligosaccharides are commonly attached to the -OH group of O ribose O tyrosine lysine…

A: 0-linked oligosaccharides are short chains of sugar molecules that are attached to a protein or…

Q: Identify the source of the atoms in the pyrimidine ring

A: Introduction: Nucleotides are the backbone of DNA and RNA. Purines and pyrimidines are the nitrogen…

Q: A long-chain amino alcohol joined by an amide bond to a fatty acid and containing a glycosidic or a…

A: Biological macromolecules are those large molecules that are necessary for the survival and growth…

Q: Primary amine groups of amino acids react with aldehydesor ketones to form ____________________.

A: A primary amine is considered as the organic compound, which is derived from ammonia.

Q: Sugars that differ in one chiral center of many are called_____________________.

A: Carbohydrates consist of carbon, hydrogen, and oxygen and the empirical formula of carbohydrates are…

Q: In an anomeric pairs of monosaccharides, the b form has the —OH below the ring. A) True B) False

A: Monosaccharides are simple form of sugars such as glucose.

Q: Two sugars are epimers of each other. Is it possible to convert one to the other without breaking…

A: Epimers are carbohydrates that are the same molecular formula but differ in the configuration of a…

Q: are nitrogen bases with two rings.

A: Nitrogen bases are an integral part of a nucleotide from which the DNA is made. Apart from nitrogen…

Q: Aldehyde sugars are also referred to as _________________.

A: Sugars or carbohydrates are macromolecules that are essential in living beings. They are present in…

Q: The chemical bond that links amino acids in a polypeptide is an _____________.

A: Introduction: The organic molecule that contains two functional groups amine and carboxyl is known…

Q: The conjugate of a very weak base is a(n) a. Very weak acid d. Very weak base b. Weak acid е. Weak…

A: The conjugate of a very weak base is a strong acid.  A conjugate acid is formed when a proton is…

Q: Which of the following sugars do not have asymmetric centers?

A:

Q: Oxidation of the aldehyde group of a sugar produces a(n) _____________ acid.

A: Sugar or carbohydrates are biomolecules formed of the monosaccharides or simple sugars that can be…

Q: _____________ is a disaccharide in which galactose is linked to glucose by a β-glycosidic linkage.

A: Lactose is a sugar found only in milk. It is also present in dairy products and products made from…

Q: why are peptide bonds are  planar, forming amide plane

A: Introduction Peptide bonds are amide linkages formed between the α-amino group of one amino acid and…

Q: The product of the reaction between an aldehyde or ketone and an amine is called a _____________…

A: The product of the reaction between an aldehyde or ketone and an amine is called a Schiff base.

Q: All sugar residues are in their D-isomeric forms. As drawn, there are ________ chiral carbons in…

A: Chiral center refers to an asymmetric atom. For example, chiral carbon is a carbon atom that is…

Q: Classify the following nitrogenous bases into purines or pyrimidines.

A: Purines : Adenine and Guanine are purines . Pyrimidines : Thymine , Cytosine and Uracil are…

Q: When a purine or pyrimidine is linked through a b-Nglycosidic link to C-1 of a pentose, the molecule…

A: Nucleosides are the structural subunit of nucleic acids such as DNA and RNA. It consists of…

Q: Which bases can exist in either keto or enol form

A: Tautomers are molecular isomers found in fluid or in cells. Chemical bonds are changed numerous…

Q: Is the statement true or false, transition occurs when a pyrimidine is replaced by another…

A:

Q: For a sugar to behave as a reducing sugar, it must have a free aldehyde group. Fructose is a ketose,…

A: Reducing sugars the carbohydrate which has free aldehyde or ketone group upon reacting with reducing…

Q: A structure formed by a covalent bond between a nitrogenous base and a pentose sugar is called??

A: In DNA the nucleotide are linked to one another in a chain by chemical bonds, called ester bonds,…

Q: A chiral center is a carbon with four different substituents. The number of chiral centers in…

A: Carbohydrates are polyhydroxy aldehyde or polyhydroxy ketone or compounds which produce them on…

Q: Determine where the pyrimidine ring's atoms come from.

A: Introduction: DNA and RNA are made up of nucleotides. Purines and pyrimidines are nitrogen bases in…

Q: A pyrimidinr always pairs with a ___________

A:

Q: Cytidine is a nitrogenous base or nucleosides?

A: Cytidine is present in DNA.

Q: With  the following amino acid side chain  can the side chain of threonine form hydrogen bonds? Q.)…

A: Hydrogen bonds are electrostatic interactions formed among the macromolecules. In a biological…

Q: In 3 sentences, explain this.   Discuss the difference between an ⍺-D-glucose and a β-D-glucose.…

A: Carbohydrates act as the primary energy source for most of the organisms present on earth.…

Q: Nucleotides found in DNA contain a sugar called dexoyribose, while the sugar group in RNA is called…

A: Nucleotides are molecules comprising a nucleoside and phosphate group. They serve as basic building…

Q: When a purine or a pyrimidine is linked through a β-N-glycosidic link to C-1 of a pentose, the…

A: Nucleic acids are the biomolecules that contain Deoxyribose sugar (DNA) and ribose sugar (RNA) .both…

Q: Which of these statements about the tertiary structure of a polypeptide is(are) untrue? You may…

A: Protein play wide variety of essential function in our body. They provide strength and structural…

Q: Predict the geometry around each carbon atom in the amino acid alanine.

A: Molecular geometry can be predicted from the structure by using the valence-shell Electron-pair…

Q: The addition of monomeric units to one end of a polymer and their removal from the opposite end such…

A: Introduction The cytoskeleton of a cell is made up of intermediate filaments. actin filaments and…

Q: The pyrimidines are nitrogenous bases that have one organic ring in their chemical structure. Select…

A: Answer: PYRIMIDINES and PURINS are the nitrogen bases which when combine with sugar group and…

Q: The name of the chemical bond formed between sugar molecules is called a

A: Chemical bond is an attraction between ions, atoms, and molecules that helps in the formation of…

Q: Oxidation of the aldehyde group of ribose yields a carboxylic acid. Draw the structure of ribonic…

A: Ribonic acid is also known as sugar acid. Ribose is as sugar which on complete oxidation yields…

Q: Amino acid polymers consisting of more than 50 amino acids are called _____________.

A: Amino acids are building blocks of proteins where each residual was joined by a covalent bond.…

Q: A nucleoside consists of an organic base, bound to ribose or deoxyribose. Draw the structure for…

A: Nucleotides are the monomers of nucleic acids, DNA and RNA. A nucleotide is composed of a…

Q: A polyhydroxylated aldehyde or ketone containing 3 carbons or more is called

A: An aldehyde is a chemical compound that comprises of a functional group and resembles the structure…

Q: The isomerization of glucose-6-phosphate yields the molecule __________________________.

A: Isomerization is the process, in which molecules are arranged without addition or removal from…

Q: The significance of this molecule is that: Adenine Phosphate groups OH OH Rbose

A: ATP (adenosine triphosphate) acts as a connection between catabolism and anabolism. It is the energy…

Q: Two sugars which differ from one another only in configuration around a single carbon atom are…

A: Diastereomers, enantiomers, epimers etc are terms used to study stereochemistry of biomolecules.…

Q: Cystine is unique among the amino acids because it contains a _____________ bond

A: Cystine is a unique amino acid. It is formed by two cysteine molecules joined together. It is more…

Q: The main chemical structure difference between ribonucleic acid and deoxyribonucleic acid is in the…

A: Nucleic acids are the polymers that are known to be essential to all forms of life. Nucleic acids…

Q: The structure of D-galactose differs from that of D-talose at which carbon atom? carbon #2 carbon #3…

A: Epimers are a pair of diastereomers that have more than one chiral center but they differ only at…

Nucleotides

It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). 

Nucleic Acids

Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.