Which of the following would be most useful in following gene expression in a yeast cell?

a. Southern blot
b. PCR
c. DNA microarray
d. Restriction enzymes

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Understand the goal: The question asks which method is most useful for following gene expression in a yeast cell. Gene expression refers to the process by which information from a gene is used to synthesize functional gene products like RNA or proteins.

Review each option's purpose: - Southern blot is used to detect specific DNA sequences in DNA samples. - PCR (Polymerase Chain Reaction) amplifies DNA sequences but does not directly measure gene expression. - DNA microarray is a technique that measures the expression levels of many genes simultaneously by detecting mRNA. - Restriction enzymes cut DNA at specific sequences and are tools for DNA manipulation, not for measuring expression.

Identify which method directly relates to gene expression: Since gene expression involves mRNA production, methods that detect or quantify mRNA are most relevant.

Recall that DNA microarrays work by hybridizing labeled cDNA (made from mRNA) to probes on a chip, allowing researchers to monitor the expression levels of thousands of genes at once.

Conclude that the DNA microarray is the most useful technique among the options for following gene expression in yeast cells.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Gene Expression

Gene expression refers to the process by which information from a gene is used to synthesize functional gene products like RNA or proteins. Monitoring gene expression helps understand which genes are active under certain conditions, especially in organisms like yeast.

Southern Blot

Southern blotting is a technique used to detect specific DNA sequences within a DNA sample. It is useful for analyzing gene presence or structure but does not provide information about gene expression or RNA levels.

DNA Microarray

DNA microarrays allow simultaneous measurement of expression levels of thousands of genes by detecting mRNA abundance. This technique is ideal for tracking gene expression patterns in cells, such as yeast, under different conditions.

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