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Biochemistry

Template biosyntheses

29 topics with concise summaries: definitions, key facts, and classroom questions.

Template biosyntheses form the foundation of molecular biology and are key to understanding how genetic information is stored, copied, and expressed. The section begins with the chemical structure of nucleotides, DNA, RNA, and histone chromatin packaging. Building on this foundation, we analyze in detail the central dogma of molecular biology: replication, transcription (followed by RNA processing), and translation on ribosomes.

A significant portion of the materials is dedicated to how the cell controls these processes. You will study gene expression regulation in prokaryotes and eukaryotes, hormonal control, the action of interferons, and mechanisms ensuring immense protein diversity (e.g., immunoglobulin gene rearrangements). We also examine "errors" and their correction: mutations, genetic polymorphism, and DNA repair systems.

In classes and exams, instructors traditionally focus on the enzymatic machinery of replication and translation, as well as applied medical topics. Therefore, pay special attention to the properties of the genetic code, PCR principles, hybridization, cloning, recombinant DNA technology, and modern approaches in DNA diagnostics and gene therapy.

Section Topics

Structure of nucleotidesNucleotides are structural components of nucleic acidsStructure of nucleic acidsNucleic acids are essential biopolymers consisting ofChromatin and histonesChromatin is a complex of a DNA molecule and specific proteins in theNucleic acid hybridizationNucleic acid hybridization is a fundamental analytical methodDNA replicationReplication is a template-driven process of DNA duplication that ensures accurateDNA repairDNA repair is a critically important and continuous cellular processTranscriptionTranscription is the process of RNA biosynthesis using aRNA processingRNA processing is a complex of post-transcriptional modifications thatRibosomesRibosomes are highly complex macromolecular structures that provideGenetic codeThe genetic code (or biological code) is a universal way of encodingTranslationTranslation is the fundamental biochemical process of translating geneticInhibitors of template biosynthesesInhibitors of template biosyntheses are substances that block the processes ofRegulation of gene expression in prokaryotesGene activity in prokaryotes is controlled in accordance with the theory ofRegulation of gene expression in eukaryotesRegulation of gene expression in eukaryotes is a system of adaptive controlInterferonsInterferons are a group of specialized related proteins thatHormonal regulation of template biosynthesesTemplate biosyntheses in the body are under the strict control of endocrineImmunoglobulin genesGermline human cells lack ready-made complete genes for creatingDNA mutationsDNA mutations are unrepaired changes in the primary structure of deoxyriboPolymerase chain reactionPolymerase chain reaction (PCR) is a powerful laboratory method for targetedDNA cloningDNA cloning is a molecular biological method that allows obtainingDNA diagnosticsDNA diagnostics is a set of molecular genetic methods aimed atDNA structureAcidum deoxyribonucleicumRNA structureAcidum ribonucleicumPost-transcriptional RNA modificationsPost-transcriptional modifications are a cascade of covalent chemical changesPost-translational modificationsPost-translational modifications are a complex of obligatory biochemicalMechanisms of protein diversity in eukaryotesThe set and quantity of synthesized protein molecules in eukaryotic cells areGenetic polymorphismGenetic polymorphism is the appearance of minor variations, not critical for lifeRecombinant DNA technologyRecombinant DNA technology is a set of methods that allow isolatingDNA diagnostics and gene therapyDNA diagnostics is a set of molecular genetic methods aimed at

Frequently asked questions for this section

RNA contains ribose, while DNA contains deoxyribose.

RNA contains ribose, while DNA contains deoxyribose. This key difference is reflected in the names of the nucleic acids themselves.

How does DNA chemically differ from RNA?

The main difference lies in the substituent at the 2'-carbon atom of the sugar (pentose). In DNA, it is hydrogen (deoxyribose), while in RNA, it is a hydroxyl group (ribose).

At what temperature does DNA denaturation occur during this method?

Breaking of hydrogen bonds and strand separation (denaturation) occurs when the sample is heated to 80–90°C.

What is the difference between the leading strand and the lagging strand?

The leading strand is synthesized continuously in the direction of the replication fork movement. The lagging strand is formed discontinuously, as short Okazaki fragments, against the direction of the fork.

Which nitrogenous bases should not be found in normal DNA?

Normally, DNA lacks uracil, hypoxanthine, and xanthine. They appear only as a result of spontaneous deamination of cytosine, adenine, and guanine, respectively, after which they are removed by repair enzymes.

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