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. 
 
        
             
        
        
        
Answer:
The answer to your question is ACUCTTCUGGUCCCAACA
Explanation:
Base sequence 
                          TGAGAAGACCAGGGTTGT
Nitrogenous bases change from DNA to RNA
                    DNA                      RNA
                       Adenine                 Uracil
                       Thymine                  Adenine
                       Guanine                 Cytosine
                       Cytosine                 Guanine
Then from left to right, the new sequence the RNA is
                         
                            ACUCTTCUGGUCCCAACA
                          
 
        
             
        
        
        
Answer:
competition
Explanation:
An ecological community is a naturally occurring group of native plants, animals and other organisms that are interacting in a unique habitat. Its structure, composition and distribution are determined by environmental factors such as soil type, position in the landscape, altitude, climate and water availability(Department of Agriculture). 
A climax community refers to the last stage of ecological succession in which the community remains relatively unchanged unless it is destroyed by events such as fire or human interference. 
Competition between species in the same habitat is an important biotic factor in discussing ecological succession and the emergence of climax communities. Competition leads to a drop in the diversity of species in a given ecosystem because the dominant species live on and reproduce while the other species die off.
 
        
             
        
        
        
Answer:
Proteins.
Explanation:
If the mRNA is damaged, it directly interferes with the ability of producing proteins in animal cell because mRNA is responsible for carrying the protein blueprint from a cell's DNA to its ribosomes which are considered as the machines of the cell that produces proteins for the cell. These messenger RNA has the information about what type of proteins are required to produced for the cell. So if mRNA is damaged, the ribosomes are unable to produce proteins for the cell.