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Ch. 8 - Molecular Biology of Transcription and RNA Processing
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoSanders 3rd EditionCh. 8 - Molecular Biology of Transcription and RNA ProcessingProblema 30b
Capitolo 8, Problema 30b

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.
Which nucleic acid is indicated by the 'b' pointer? Justify your answer. 

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1
Analyze the context of the problem: The question involves hybridization of single-stranded DNA (ssDNA) and mRNA. Hybridization occurs when complementary nucleic acid sequences bind to each other, forming a DNA-RNA hybrid.
Understand the experimental setup: Genomic DNA is fragmented and denatured into single strands, while mRNA is isolated from the cytoplasm. The hybridization process allows mRNA to bind to complementary sequences in the ssDNA.
Interpret the electron micrograph: The image likely shows regions where mRNA has hybridized with ssDNA, as well as regions where ssDNA remains unbound. The 'b' pointer in the image is likely pointing to a specific nucleic acid structure.
Determine the identity of the nucleic acid at 'b': If the 'b' pointer indicates a region where no hybridization has occurred, it is likely single-stranded DNA (ssDNA). This is because mRNA only hybridizes with complementary sequences, leaving non-complementary regions of ssDNA unbound.
Justify the answer: The 'b' pointer likely indicates ssDNA because it represents a region of the genomic DNA that does not have a complementary sequence in the mRNA. This could correspond to introns or non-coding regions of the DNA, which are not transcribed into mRNA.

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Hybridization

Hybridization refers to the process where complementary nucleic acid strands bind together to form a double-stranded structure. In this context, single-stranded DNA from the mouse genome can hybridize with mRNA, which serves as a template for protein synthesis. This interaction is crucial for understanding the relationship between DNA and RNA in gene expression.
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mRNA (Messenger RNA)

mRNA, or messenger RNA, is a type of RNA that carries genetic information from DNA to the ribosome, where proteins are synthesized. It is transcribed from DNA and serves as a template for translation, allowing the genetic code to be expressed as proteins. In the experiment, mRNA is isolated from mouse cells and is essential for understanding the hybridization process.
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Electron Micrography

Electron micrography is a technique that uses electron beams to visualize samples at a very high resolution, allowing for detailed imaging of cellular structures and molecular interactions. In this scenario, the electron micrograph shows the hybridization of DNA and mRNA, providing visual evidence of their interaction and helping to identify the nucleic acids involved.
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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.

What term best identifies the nucleic acid region indicated by the 'c' pointer?

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Domanda del libro di testo

The DNA sequence below gives the first 12 base pairs of the transcribed region of a gene, and the template and nontemplate strands of DNA are identified. The transcription start is the thymine nucleotide at the end of the sequence given. Use the diagram to answer the list of questions. Make a copy of the diagram before you begin answering the questions, or have one group member diagram the answers for bacteria and another group member diagram the answers for eukaryotes.

Nontemplate strand ___________ TTGCTACGGTCA___________

Template strand    ___________ AACGATGCCAGT___________

Assuming the sequence shown is part of a eukaryotic gene, what consensus sequence(s) would you expect to identify within about 100 base pairs of the start of transcription?

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Domanda del libro di testo

The DNA sequence below gives the first 12 base pairs of the transcribed region of a gene, and the template and nontemplate strands of DNA are identified. The transcription start is the thymine nucleotide at the end of the sequence given. Use the diagram to answer the list of questions. Make a copy of the diagram before you begin answering the questions, or have one group member diagram the answers for bacteria and another group member diagram the answers for eukaryotes.

Nontemplate strand ___________ TTGCTACGGTCA___________

Template strand    ___________ AACGATGCCAGT___________

Write the anticipated eukaryotic consensus sequence(s) in the approximate position(s) on the diagram.

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Domanda del libro di testo

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.

Which nucleic acid is indicated by the 'a' pointer? Justify your answer. 

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Domanda del libro di testo

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?

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Domanda del libro di testo

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.

What term best identifies the nucleic acid region indicated by the 'd' pointer? 

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