The<u> repressor </u>is a type of regulator protein that binds to a region of DNA in the promoter of a gene called the operator and prevents transcription from taking place.
In the field of science, a regulator protein can be described as a kind of protein that affects the transcription of a gene by having an influence on particular DNA sites. The rate of synthesis of various proteins is controlled by the regulator proteins.
A repressor is a kind of regulator protein that prevents the transcription of a particular gene. When the rate of a protein in the body has reached normal, the transcription of the protein needs to be stopped in order for more protein of that kind to be formed. The repressor binds itself to the operator region for the gene, hence stopping the transcription process until the protein is required again.
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Although the operation of natural selection requires that genotypes differ in fitness, for some geneticists it seems easier to understand natural selection than fitness. Partly this reflects the fact that the word “fitness” has been used to mean subtly different things. Here I distinguish among these meanings (e.g., individual versus absolute versus relative fitness) and explain how evolutionary geneticists use fitness to predict changes in the genetic composition
The microscope is inexpensive and easy to use is an advantage of electron microscopy. High resolution images of both biological and non-biological specimens can be obtained using the electron microscopy (EM) technique. In order to fully understand the structure of tissues, cells, organelles, and macromolecular complexes, it is employed in biomedical research.
There are various kinds of electron microscopes, such as the scanning electron microscope (SEM), the transmission electron microscope (TEM), and the reflection electron microscope (REM.). Magnification and better resolution are possible thanks to the utilization of electrons as opposed to light waves, allowing for the analysis of structures that would otherwise be invisible.
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the cranial nerve that passes through the cribriform plate of the ethmoid bone is the olfactory nerve.
Olfactory nerve perforate this plate as they pass up to the brain from the mucous lining of the nose.
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