Answer:
The best answer to the question: If every gene has a tissue-specific and signal-dependent transcription pattern, how can such a small number of transcriptional regulatory proteins generate a much larger set of transcriptional patterns? Would be:
Because transcriptional regulators, which are the ones responsible for initiating, and stopping, transcription of RNA into protein, often work in pairs, one goes with the other, and thus increase the regulatory capabilities over gene expression so that the genes translated into RNA and then transcribed into aminoacids in protein chains, actually code for the correct protein types.
These regulators will both stand, as appropriate, on a specific gene to promote its transcription, or prevent it, depending on the different signaling mechanisms received.
While the absorbance at 420 nm is related to the amount of o-nitrophenol produced, the absorbance at 600 nm is proportional to cell density, which aids in standardizing our estimations of enzyme activity.
<h3>Describe absorbance.</h3>
The amount of light absorbed by a solution is measured by its absorbance (A), often referred to as optical density (OD). The amount of light that may flow through a solution is called its transmittance.
<h3>How is the activity of beta-galactosidase determined?</h3>
The colorless ONPG substrate is changed by beta-Galactosidase into galactose and the chromophore o-nitrophenol, which results in a vivid yellow solution. The amount of substrate transformed at 420 nm can be calculated by measuring the solution's beta-galactosidase activity using a spectrophotometer or a microplate reader.
<h3>What is measured by the beta-galactosidase assay?</h3>
The -Gal Assay Kit gives users the tools they need to swiftly assess the amounts of active beta-galactosidase expressed in cells that have been transfected with plasmids encoding the lacZ gene.
learn more about absorbance here
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Answer: The answer to the question is D
Explanation:
The skeletal systems composed of the bones and network of tendors, ligaments and cartilages that connects and fasten the bones together. The skeletal systems are grouped or divided into two, namely the Axial and the appendicular, The system provides the stroctural supports for the human body and also safe guard the various organ fron damage. The system serves other vital functions.
It is important to prevent soil erosion, because when soil is eroded is can lead to the <em>pollution of water</em> around it/ water that passes through it. Since water is one of the basic necessities of all life, polluted water and cause illness or death among humans, plants, or animals. As soil is eroding, the <em>quality of it is reduced</em>. This disturbs plant life and agriculture.
Ways to prevent soil erosion:
- crop rotation
- increased vegetation
- terracing
- strip cropping
Hope I helped ! :)
