A clastic rock composed of sand-sized grains derived from the physical weathering of granite and containing a sizable proportion of feldspar is termed as arkose. It is a sedimentary rock that has a composition of at least 25% feldspar. It is a type of sandstone that has a coarse texture and is commonly in gray or pink in color. The most important minerals in arkose are feldspar and quartz. And, it is quartz that is dominant in composition. This rock is formed from weathering of metamorphic or igneous rock that are rich in feldspar. They are to be quickly deposited into cold environments so as to avoid chemical weathering.
The time that would elapse before a robot at a distance see the light flash is : 2000 secs
<h3 /><h3>Analysis of the solution </h3>
<u>Given data :</u>
Distance = 4 AU
Time for light to reach the earth = 8 mins 20 seconds
speed of light ( c ) = 299,792,458 m / s
To resolve this we will apply the equation below
Time = Distance / Speed ------ ( 1 )
where : Distance= 4 AU, speed = c
Therefore :
Time = 4 AU / c
AU / c = ( 8 * 60 + 20)
Hence the time that would elapse before a robot at a distance see the light flash will be
Time = 4 ( 8*60 + 20) = 2000 secs
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Answer:
D) presence of transcription activators or repressors
Explanation:
The reason why this is not post-transcriptional regulation is that activators actually start the process of transcription by binding to specific sites. while on contrary when repressor binds it halt the process.
For example, there is a protein called CAP which in the presence of cAMP bind with promoter region and enhances the activity of RNA polymerase . While in the absence of cAMP it can not bind to promoter hence the transcription stooped.
