Why do eukaryotes express a significantly smaller percentage of their genes than prokaryotes?
A. Eukaryotes are less complex than prokaryotes and can not control which genes are randomly expressed. B. Eukaryotic cells are often specialized and need only to express specific regions of the DNA. C. Prokaryotes use and transcribe all of their DNA, while only eukaryotes have \junk DNA\ which does not code for anything. D. Only Eukaryotes have ribosomes which transcribes specific sections of DNA.
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B. LucianLiterature Professor, Diploma in Classic Literature, Denver, Colorado
Literature Professor, Diploma in Classic Literature, Denver, Colorado
Answered on Nov 01, 2019
The correct answer to this question is option B. Eukaryotes often express a significantly smaller percentage of their genes in gene expression because eukaryotic cells are specialized and they only need to express specific regions of the DNA to code for proteins. The process of controlling the gene in specific DNA region expressed is termed gene regulation.
The genes expressed largely depend on the chemical signal that binds to its receptors to cause a change in gene expression. These chemical signals will activate certain transcription factors that will bind to specific DNA sequence and this leads to transcription. In prokaryotes, the DNA is housed within one chromosome and by defaults all the genes present in the cell are on. Transcription and translation also occur simultaneously in the cytoplasm.