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.
The answer is D glycolysis
Because the pigments in objects absorb or reflect light, and the reflected light which we recognize as a specific color. Each person or animal could recognize that color as something completely different than another. Also, because color is only a reflection of light, what we recognize may not be an inherent property at all.
I hope this helps at least a little!
The answer for this question is pairs of nitrogen bases
So that there is a uniform system in which all people can use without conversions or mistakes in such conversions.