By Michael J. Gibney, Ian A. Macdonald, Helen Roche
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Young ones love quickly nutrients. And the quick foodstuff certainly loves little ones. It couldn’t continue to exist with out them. were you aware that the most important toy corporation on this planet is McDonald’s? It’s precise. in reality, one out of each 3 toys given to a toddler within the usa every year is from a quick foodstuff eating place.
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Extra info for Nutrition and Metabolism, 2nd Edition
The CAP site is followed by the initiation, or start codon (ATG), which specifies the start of translation; hence, according to the genetic code every polypeptide begins with methionine. The DNA coding sequence for a gene in eukaryotes is not contiguous or uninterrupted. Each gene contains DNA sequences that code for the amino acid sequence of the protein, which are called exons. These exons are interrupted by non-coding DNA sequences, which are called introns. The last exon ends with a stop codon (TAA, TAG or TGA), which represents the end of the gene-coding region and it is followed by the terminator sequence in the DNA sequence that defines the end of the gene-coding region.
Ribonucleic acid RNA, like DNA, carries genetic information. The composition of RNA is very similar to DNA, and it plays a key role in all stages of gene expression. RNA is also a linear polynucleotide, but it differs from DNA in that it is single stranded and composed of polymers of ribose rather than deoxyribose, the pyrimidine base uracil (U) replaces thymine (T), and it is relatively unstable when compared to DNA. There are at least five different types of RNA in eukaryotic cells and all are involved in gene expression: ● ● Messenger RNA (mRNA) molecules are long, linear, single-stranded polynucleotides that are direct copies of DNA.
Beside these domains, transcription factors often contain a nuclear localisation signal to direct the protein from the cytoplasm to the nucleus and specific amino acids that can be modified by, for instance, phosphorylation, ubiquitinylation or acetylation and thereby get activated or inactivated. These modifications enable fine-tuning of the action of transcription factors. As mentioned, transcription factors play a key role in temporal and tissue-specific gene expression. On binding they are able to influence the transcription of usually more than one gene.