Gene regulation refers to the mechanisms that control the expression of specific genes, determining when and how much of a gene's product (usually proteins) are made in a cell.
From the statements you provided, the following is accurate regarding gene regulation:
- Only the DNA that a cell needs is turned on in that cell. This statement reflects the concept of gene regulation, as different cell types express different sets of genes depending on their function and environmental signals, leading to cell differentiation and specific responses.
The other two statements are not accurate:
- DNA can be turned on in a cell if the brain needs it activated. This is somewhat misleading; gene expression can be influenced by various factors, including cell signaling, but the brain is not the sole regulator of gene expression in all cells.
- All your DNA is turned on all of the time, in every cell. This statement is false; not all genes are active in every cell. Each cell type has a specific set of genes that are expressed, depending on its function and regulatory factors.
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