A nucleic acid probe is used to __________.

• A. clone genes
• B. produce a large amount of DNA from a tiny amount of DNA
• C. make exact copies of DNA sequences
• D. make DNA from RNA
• E. identify genes that have been separated by electrophoresis or mRNA molecules through in situ hybridization

Answer: (E)

Verified step by step guidance

1. Understand the concept of a nucleic acid probe: A nucleic acid probe is a fragment of DNA or RNA used to detect the presence of complementary sequences by hybridization.
2. Recognize the application of nucleic acid probes: They are commonly used in techniques like Southern blotting, Northern blotting, and in situ hybridization to identify specific DNA or RNA sequences.
3. Consider the process of electrophoresis: Electrophoresis is a method used to separate DNA, RNA, or proteins based on size and charge, allowing for the identification of specific sequences using probes.
4. Explore in situ hybridization: This technique involves using nucleic acid probes to detect specific mRNA molecules within cells or tissues, providing spatial information about gene expression.
5. Conclude the purpose of nucleic acid probes: They are primarily used to identify genes or mRNA molecules, not for cloning, amplifying, or synthesizing DNA from RNA.