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What is protein synthesis?
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How does protein biosynthesis start?
Cells express their genes by converting the genetic message into protein. This process of protein synthesis occurs in two stages - transcription and translation.
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Protein synthesis; Effect of genetic variants on phenotype;...
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Protein synthesis is process in which polypeptide chains are formed from coded combinations of single amino acids inside the cell. The synthesis of new polypeptides requires a coded sequence, enzymes, and messenger, ribosomal, and transfer ribonucleic acids (RNAs). Protein synthesis takes place within the nucleus and ribosomes of a cell and is regu...
Protein synthesis steps are twofold. Firstly, the code for a protein (a chain of amino acids in a specific order) must be copied from the genetic information contained within a cell’s DNA. This initial protein synthesis step is known as transcription. Transcription produces an exact copy of a section of DNA. This copy is known as messenger RNA (mRN...
The result of protein synthesis is a chain of amino acids that have been attached, link by link, in a specific order. This chain is called a polymer or polypeptide and is constructed according to a DNA-based code. You can picture a polypeptide chain as a string of beads, with each bead playing the part of an amino acid. The order in which the beads...
In the nucleus, two strands of DNA are held together by nitrogenous bases (also called nucleobases or bases). Four bases – cytosine, guanine, adenine, and thymine – form the letters of the words in the DNA recipe book. One strand of DNA holds the original code. If the instructions of this code are carefully followed, a specific correct polypeptide ...
To make the copied stretch of code (transcription) we need enzymes called RNA polymerases. These enzymes gather free-floating messenger RNA (mRNA) molecules inside the nucleus and assemble them to form the letters of the code. Each letter of DNA code has its own key and each new letter formed by mRNA carries a lock that suits this key, a little lik...
The site of protein synthesis is twofold. Transcription (copying the code) occurs within the cell nucleus where DNA is located. Once the mRNA copy of a small section of DNA has been made it travels through the nuclear pores and into the cell cytoplasm. In the cytoplasm, the strand of mRNA will move towards a free ribosome or one attached to the rou...
The transcription process is the first step of protein synthesis. This step transfers genetic information from DNA to the ribosomes of the cytoplasm or rough endoplasmic reticulum. Transcription is divided into three phases: initiation, elongation and termination.
During the translation process, the small and large subunits of a ribosome close over a strand of mRNA, trapping it loosely inside. Ribosomes arrange the strand into codons or sets of three nitrogenous base letters. This is because the code for a single amino acid – the most basic form of a protein – is a three-letter nucleobase code. As ribosomes ...
Learn how polypeptide chains are formed from coded combinations of single amino acids inside the cell. Discover the steps, molecules, and levels of protein synthesis, from transcription to translation, and the difference between polypeptides and proteins.
Aug 25, 2023 · Protein synthesis is the creation of proteins. In biological systems, it is carried out inside the cell. In prokaryotes, it occurs in the cytoplasm. In eukaryotes, it initially occurs in the nucleus to create a transcript (mRNA) of the coding region of the DNA.
Feb 17, 2023 · Learn what protein synthesis is, how it occurs in two steps: transcription and translation, and what are the roles of DNA, RNA, and amino acids. See a flowchart and a diagram of the process and its components.
Learn how cells produce new proteins from DNA templates through transcription and translation. Find out the roles, mechanisms and diseases of protein biosynthesis in prokaryotes and eukaryotes.
Learn how cells make proteins through transcription and translation, the two processes of the central dogma of molecular biology. See diagrams, examples, and videos of the steps and stages of protein synthesis.
Transcription and RNA processing are followed by translation, the synthesis of proteins as directed by mRNA templates. Proteins are the active players in most cell processes, implementing the myriad tasks that are directed by the information encoded in genomic DNA.
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