Its B.cell wall
ribosomes are used to synthesis proteins and other components required for cells
endoplamsic reticulum is where the ribosomes are its a structure that helps to prepare the components and to bring them to the golgi body
the cell wall is only present in plants (cellulose) and fungi (chitin) and it helps plants to regulate their water intake physically
the cytoplasmis present in all cells as the medium which organelles are suspended in and in contact with
hope that helps <span />
<span>Mimosa pudica
Hope this helps :)</span>
Gene regulation in eukaryotic cells is regulated by repressors as well as by transcriptional activators. Like their prokaryotic counterparts, eukaryotic repressors bind to specific DNA sequences and inhibit transcription. Any step of gene expression may be modulated, from the DNA-RNA transcription step to post-translational modification of a protein. The following is a list of stages where gene expression is regulated, the most extensively utilised point is Transcription Initiation: Chromatin domains.
D) A substance that is altered in a chemical reaction.
