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Chapter 12: Problem 1

Explain the central dogma of genetics at the molecular level.

Short Answer

Expert verified
The Central Dogma of Genetics describes the flow of genetic information in cells, starting from DNA transcribing into RNA through a process called transcription. The RNA undergoes further processing before being translated into proteins in a process called translation.

Step by step solution

01

Transcription

Transcription is the initial step of the Central Dogma of Genetics where the genetic information stored in the DNA molecule is transferred to an RNA molecule. The segment of DNA that is being transcribed unwinds and unzips, separating the two strands. One of these strands then serves as a template, where an enzyme called RNA polymerase moves along the strand and connects RNA nucleotides complementary to the DNA template strand, forming a single-strand mRNA (messenger RNA).
02

RNA Processing

Once transcription is complete, the mRNA undergoes further processing before it can be translated into proteins. This includes the addition of a 5' cap and a Poly-A tail for stability and protection, as well as the process of splicing where introns (non-coding regions) are removed and exons (coding regions) are joined together.
03

Translation

Translation is the process in which proteins are synthesized. The processed mRNA leaves the nucleus and proceeds to a ribosome, the site of protein synthesis. The ribosome moves along the mRNA, reading its sequence three nucleotides at a time (codon). Each codon corresponds to a specific amino acid or stop signal. Transfer RNA (tRNA) brings the appropriate amino acid to the ribosome, where it is added to the growing peptide chain. The ribosome continues to translate the mRNA until it reaches a stop codon, marking the end of translation and releasing the complete protein.

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Most popular questions from this chapter

What is the consensus sequence of the following six DNA sequences? GGCATTGACT GCCATTGTCA CGCATAGTCA GGAAATGGGA GGCTTTGTCA GGCATAGTCA

What is the complementarity rule that governs the synthesis of an RNA molecule during transcription? An RNA transcript has the following sequence: 5'-GGCAUGCAUUACGGCAUCACACUAGGGAUC-3' What is the sequence of the template and coding strands of the DNA that encodes this RNA? On which side (5' or \(3^{\prime}\) ) of the template strand is the promoter located?

In eukaryotes, what types of modifications occur to pre-mRNAs?

A mutation within a gene sequence changes the start codon to a stop codon. How will this mutation affect the transcription of this gene?

What is the function of a splicing factor? Explain how splicing factors can regulate the cell-specific splicing of mRNAs.
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