Multiple Choice
Gene expression is defined as which of the following?
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7. Gene Expression
Basics of Gene Expression Control
Multiple Choice
In the context of gene expression control, which of the following best explains how genetically identical cells can become specialized (differentiate) into different cell types?
A
Differential gene expression, in which different sets of genes are turned on or off in different cells
B
Different DNA sequences in each cell created during mitosis
C
Random changes in chromosome number that permanently alter cell identity
D
Uniform expression of all genes in all cells, producing identical proteins in every cell type
Verified step by step guidance1
Understand that all cells in a multicellular organism typically have the same DNA sequence, meaning their genetic material is identical.
Recognize that cell differentiation occurs because different cells express different subsets of genes, leading to the production of different proteins and thus different cell functions.
Recall that gene expression is regulated at multiple levels, including transcriptional control, which determines which genes are turned on or off in a particular cell.
Eliminate options that suggest changes in DNA sequence or chromosome number, as these are not the primary mechanisms for differentiation in genetically identical cells.
Conclude that the best explanation for how genetically identical cells become specialized is differential gene expression, where different genes are activated or repressed in different cells.
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