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A transcription factor is a protein that controls the transcription of genes by binding to a specific region of DNA. They ensure that genes are being expressed in the correct cells, at the correct time and to the right level. It is estimated that ~10% of human genes code for transcription factors.
Discover gene expression where protein is synthesised and DNA sequences are transcribed and translated; this involves Messenger, Transfer and Ribosomal RNA.
Revise mitosis, the cell cycle and how stem cells work in humans and plants for GCSE Biology, AQA.
Aug 7, 2024 · Organelles involved in protein production, and their roles, include: nucleus. DNA is stored. The nucleolus manufactures ribosomes. Transcription occurs, during which an mRNA copy of DNA is produced. ribosomes. mRNA leaves the nucleus and attaches to a ribosome.
In A-Level Biology, transcription refers to the process by which a DNA sequence is copied into an RNA sequence by the enzyme RNA polymerase. Transcription is an important step in gene expression, as it allows the genetic information contained in DNA to be used to synthesize proteins.
The following process is used to calibrate an eyepiece graticule: Set up the microscope to the required magnification to view the sample. Place a stage graticule on the stage. Line up the two scales (the stage and eyepiece graticules) similar to the diagram.
Protein synthesis consists of two stages – transcription and translation. In transcription the DNA code is read, and in translation the code is used to build up protein molecules. DNA is a ...
