Which of the following are used to assess which genes are expressed to make RNA in a given organism at a given time or under a given condition?

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DNA microarrays are specifically designed to assess gene expression at a given time or under a given condition by measuring the amount of mRNA present in a sample. PCR amplifies specific DNA sequences and can be used to measure gene expression, but it is not as useful for assessing entire sets of genes as DNA microarrays are. DNA sequencing is used to determine the exact sequence of DNA and is not as useful for measuring gene expression. Fluorescence microscopy is a technique used to visualize cellular structures and processes and is not directly used to measure gene expression. Viable cell counts are a method for determining the number of live cells in a sample and do not measure gene expression.

Which of the Following Are Used to Assess Which Genes