Is the TRP attenuator cis acting?
Attenuators are 5′-cis acting regulatory regions which fold into one of two alternative RNA structures which determine the success of transcription.
What is attenuation control of transcription?
Transcriptional attenuation is a regulatory mechanism that causes premature termination of transcription under certain conditions, thereby preventing the expression of the mRNA required for expression of the corresponding gene products.
What is attenuation in trp operon?
Like regulation by the trp repressor, attenuation is a mechanism for reducing expression of the trp operon when levels of tryptophan are high. However, rather than blocking initiation of transcription, attenuation prevents completion of transcription.
Why is transcriptional attenuation important?
Transcriptional-attenuation is characterized by the presence of an attenuator within the DNA sequence that results in formation of mRNA-stem loops that prevent further transcription from occurring. The non-functional RNA produced prevents proper transcription.
Why can’t eukaryotes use attenuation?
There is no coupling of transcription and translation in eukaryotic cells as in bacterial cells. Consequently, ribosome movement and arrest cannot modulate attenuation.
Can attenuation occur in eukaryotes?
Prokaryotes commonly use attenuation as a mechanism to control gene expression, but eukaryotes do not. In prokaryotes transcription and translation are coupled. This makes attenuation possible.
What is an attenuator do?
Attenuators are electrical components designed to reduce the amplitude of a signal passing through the component, without significantly degrading the integrity of that signal. They are used in RF and optical applications.
Can attenuation happen in eukaryotes?
Prokaryotes commonly use attenuation as a mechanism to control gene expression, but eukaryotes do not.
What can cause attenuation?
Attenuation is the reduction in power of the light signal as it is transmitted. Attenuation is caused by passive media components such as cables, cable splices, and connectors.
Is attenuation possible in eukaryotes?
Can eukaryotes do attenuation?
What is an attenuator?
An attenuator reduces an input signal to a lower level. The amount of attenuation is specified in decibels (dB). Decibel values are additive for cascaded attenuator sections.
Can attattenuator sections be cascaded?
Attenuator sections can be cascaded as in the figure below for more attenuation than may be available from a single section. For example two 10 db attenuators may be cascaded to provide 20 dB of attenuation, the dB values being additive. The voltage attenuation ratio K or VI/VO for a 10 dB attenuator section is 3. 16.
How many decibels does an attenuator reduce?
Summary: Attenuators An attenuator reduces an input signal to a lower level. The amount of attenuation is specified in decibels (dB). dB from power ratio: dB = 10 log10(PI / PO) dB from voltage ratio: dB = 20 log10(VI / VO) T and Π section attenuators are the most common circuit configurations.
What is the formula for T section attenuator?
Formulas for T-section attenuator resistors, given K, the voltage attenuation ratio, and ZI = ZO = 50 Ω. The amount of attenuation is customarily specified in dB (decibels).