Genomic DNA from a mouse is isolated, fragmented, and denatured into single strands. It is then mixed with mRNA isolated from the cytoplasm of mouse cells. The image represents an electron micrograph result showing the hybridization of single-stranded DNA and mRNA. Based on this electron micrograph image, how many introns and exons are present in the mouse DNA fragment shown?

검증된 단계별 안내

Understand the context: The problem involves analyzing an electron micrograph showing hybridization between single-stranded DNA and mRNA. This technique is used to identify the regions of DNA that correspond to exons (coding regions) and introns (non-coding regions).

Recall the principle of hybridization: mRNA hybridizes only to the complementary exonic regions of the DNA, as introns are spliced out during mRNA processing. Introns will appear as loops in the DNA strand because they do not have complementary sequences in the mRNA.

Examine the electron micrograph: Count the number of loops (representing introns) and the number of hybridized regions (representing exons). Each loop corresponds to an intron, and each hybridized segment corresponds to an exon.

Determine the total number of introns and exons: The total number of exons is equal to the number of hybridized regions, and the total number of introns is equal to the number of loops observed in the micrograph.

Summarize the findings: Based on the counts from the micrograph, you can determine the number of introns and exons in the DNA fragment. Ensure that you clearly distinguish between the two types of regions in your analysis.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Introns and Exons

Introns and exons are segments of a gene found in eukaryotic DNA. Exons are the coding regions that are expressed and translated into proteins, while introns are non-coding regions that are removed during RNA processing. Understanding the distinction between these two is crucial for analyzing gene structure and function.

Hybridization

Hybridization refers to the process where complementary strands of nucleic acids, such as DNA and RNA, bind together. In the context of the question, the hybridization of single-stranded DNA with mRNA indicates the regions of the DNA that correspond to expressed genes, which can help identify exons and infer the presence of introns.

Electron Micrography

Electron micrography is a technique that uses electron beams to visualize samples at a very high resolution. In this context, it allows researchers to observe the hybridized DNA and mRNA, providing insights into the structure of the genetic material and the arrangement of introns and exons within the DNA fragment.