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Cells can contain thousands of different genes; however there is often only a small percentage of these genes that are being expressed at any given time. this indicates that -

Acells are unable to express all genesb. gene expression is regulatedc: the expression of genes is randomd unused genes are removed from the dna

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Oseni

Answer:

b. gene expression is regulated

Explanation:

Several mechanisms exist in the cell which regulate the turning on or turning off of certain genes.

These mechanisms are collectively referred to as gene regulation. The regulation can occur in several ways, including;

  • Structural and chemical changes to genetic materials in the cell.
  • Regulation of  transcription process.
  • Regulation of mRNA translation or protein synthesis

The correct option is b.

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