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Why methionine is n formylated in prokaryotes but not in eukaryotes?
Wiki User
∙ 13y ago
i think formylated methionine is more efficient recognizer of AUG
Wiki User
∙ 13y ago
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What is the differences n prokaryotic cells and eukaryoti cells?
The simplest answer is that prokaryotic cells do not have a membrane-bound nucleus, and eukaryotic cells do. The nucleus is a compartment where the cell stores its genetic information (DNA). Prokaryotes' DNA is simply within the cytoplasm. Another simple difference is that eukaryotes have membrane-bound organelles, whereas prokaryotes lack this feature.
Are mitochondria n found in a prokaryotes cell?
No,they cannot be found.They are only found in eukariyotic cells
What is false about archaebacteria A cell walls lack peptidoglycan B lipids have ether link between glycerol and fatty acid residues C N-formyl methionine t RNA initiates translation D found in swamps?
They are found only in extreme environments.
What is one way that bacteria n archaea differ?
Archaea: cell membrane contains ether linkages; cell wall lacks peptidoglycan; genes and enzymes behave more like Eukaryotes; have three RNA polymerases like eukaryotes; and extremophilesBacteria: cell membrane contains ester bonds; cell wall made of peptidoglycan; have only one RNA polymerase; react to antibiotics in a different way than archea do.
What are the Elements and the essential elements of amino acids?
Two Part Question: Regarding Elements: Take Carbohydrates [C and H and O] and add Nitrogen and we get amino acids which are the constituent building blocks of Proteins. The essential elements of amino-acids that comprise Proteins are i) the unique -C-C-N-C-C-N-C-C-N- [poly] - Peptide Bonds, and ii) the side chain [also called the -R group] that is attached to the free [outward pointing] Nitrogen bond.
When a protein is synthesized what amino acid is always the first amino acid that is positioned during any protein synthesis?
"AUG" actually corresponds to a region of code on mRNA and is NOT an amino acid. The tRNA that has the anticodon 5' CAU 3' and recognizes AUG is a tRNA charged with Methionine. Therefore, methionine is the first amino acid incorporated into a growing polypeptide. Note this is true for only eukaryotes, prokaryotes have N-formyl methionine as their first amino acid.
What happens to the terminal methionine in most proteins that are produced?
Methionine is an important amino acid that helps to initiate messenger RNA as the standing in the N terminal position. Removal of the n terminal is the earliest possible chemical modification that can occur in protein synthesis.
What is the starting amino acid for the beta globin protein?
Methionine. Protein translation starts at the start codon (AUG) which also codes for methionine. It means all proteins start with methionine at their N-terminus, although it's usually removed by post-translational modification.
What is the differences n prokaryotic cells and eukaryoti cells?
The simplest answer is that prokaryotic cells do not have a membrane-bound nucleus, and eukaryotic cells do. The nucleus is a compartment where the cell stores its genetic information (DNA). Prokaryotes' DNA is simply within the cytoplasm. Another simple difference is that eukaryotes have membrane-bound organelles, whereas prokaryotes lack this feature.
Are mitochondria n found in a prokaryotes cell?
No,they cannot be found.They are only found in eukariyotic cells
What are three ways that prokaryotes and eukartyotes are the same?
Similarities: * Cell Wall (Prokaryotyic d/n contain cellulose) * Plasma Membrane * Chromosomes * Similar in metabolic processes * Can make own food, Eukaryotic = Autotrophs and Chemoautotrops *
How does eukaryotic cell division differ from cell division in a prokaryotic cell?
eukaryotic cell division takes more time then prokaryotic as it contain nucleus and other cellular organallis which are lacking in prokaryotes. secondaly in eukaruotes in germ cells meosis occur which is not found in prokaryotes
What is false about archaebacteria A cell walls lack peptidoglycan B lipids have ether link between glycerol and fatty acid residues C N-formyl methionine t RNA initiates translation D found in swamps?
They are found only in extreme environments.
What are the basic steps of protein synthesis?
Initiation: ribosome starts translation at start codon (AUG) Elongation: amino acid chain gets longer and longer as tRNA bring corresponding amino acids Termination: ribosome ends translation at stop codon or termination sequence (UAG, UGA, UAA) Post-translational Modification: protein splicing occurs (intein excission for final protein functionality); N-terminal and C-terminal modification (removed in prokaryotes and acetylated in eukaryotes); chemical modification (phosphorylation/dephosphorylation or glycosylation); protein folding
What is one way that bacteria n archaea differ?
Archaea: cell membrane contains ether linkages; cell wall lacks peptidoglycan; genes and enzymes behave more like Eukaryotes; have three RNA polymerases like eukaryotes; and extremophilesBacteria: cell membrane contains ester bonds; cell wall made of peptidoglycan; have only one RNA polymerase; react to antibiotics in a different way than archea do.
How do you translate Patricia into Apache?
n n n n n n n n.
Which is better animal protein or plant protein?
Plant protein is healthier and more humane.Animal protein contains carnitine, which is not an essential amino acid for humans. Your intestinal bacteria feed on the carnitine in animal protein and produce trimethylamine-N-oxide (TMAO). TMAO promotes the growth of fatty deposits on the walls of your arteries and and slows the removal of cholesterol from the arteries' walls.Animal proteins contain very large amounts of sulfur, especially in the essential amino acid methionine and the conditionally essential amino acid cysteine. Your body makes other sulfur-containing amino acids out of these, including keto-methionine, cystine, homocysteine, cystathionine, taurine, and cysteic acid.Even though you need a small amount of sulfur-containing amino acids, an excess of these amino acids beyond your needs causes the following problems:Your body breaks down the sulfur-containing amino acids into powerful sulfuric acid. Excess acid causes your body to use calcium from your bones to maintain pH. This can lead to osteoporosis and kidney stones.Your body breaks down methionine (which is very high in animal protein) into homocysteine, which is a risk factor for heart attacks, strokes, closure of your leg arteries (peripheral vascular disease), blood clots in your legs (venous thrombosis), cognitive impairment, dementia, Alzheimer's disease, and depression.Methionine feeds cancerous tumors. Normal cells can get the sulfur they need from other sulfur-containing amino acids, but cancer cells, including breast, lung, colon, kidney, melanoma, and brain cancers, need methionine. Meat and dairy products also raise the levels of a powerful growth-stimulating hormone, called insulin-like growth factor-1 (IGF-1), which magnifies the effects of methionine to promote cancer, including cancers of the breast, colon, prostate, and lung.Sulfur from high-methionine (animal) protein is toxic to the tissues of your intestine, and can damage your colon, leading to a disease called ulcerative colitis.Casein, the main protein in dairy foods, incites cancer progression.The absence of casein and the lower amounts of carnitine, methioine, and cysteine in plant protein have several advantages:Plant proteins do not incite cancer progression.A diet based on plant food is low in carnitine, which keeps your arteries healthy.Plant-based diets are low in both calories and methionine. Low-calorie diets slow the aging process and prolong life. Low-methionine diets also prolong life.Plant protein makes you smell better. The high sulfur in animal protein causes bad breath, body odor, and flatulence that smells like rotten eggs.
