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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: 9780135564172당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Sanders 3rd EditionCh. 8 - Molecular Biology of Transcription and RNA Processing문제 28b
8장, 문제 28b

Assume that a mutation affects the gene for each of the following eukaryotic RNA polymerases. Match each mutation with the possible effects from the list provided. More than one effect is possible for each mutation.
Table displaying RNA polymerase mutations and their potential effects, with spaces for responses.
Some pre-mRNA is not synthesized.

검증된 단계별 안내
1
Understand the role of each RNA polymerase in eukaryotic transcription: RNA polymerase I synthesizes rRNA (except 5S rRNA), RNA polymerase II synthesizes pre-mRNA (precursor to mRNA), and RNA polymerase III synthesizes tRNA and 5S rRNA. Additionally, snRNA (small nuclear RNA) is involved in splicing and is primarily transcribed by RNA polymerase II and III.
Analyze the mutation effects: The problem states that 'some pre-mRNA is not synthesized.' This indicates a disruption in the function of RNA polymerase II, as it is responsible for synthesizing pre-mRNA.
Match RNA polymerase I with its potential effects: A mutation in RNA polymerase I would primarily affect the synthesis of rRNA, which is crucial for ribosome assembly and protein synthesis.
Match RNA polymerase III with its potential effects: A mutation in RNA polymerase III would disrupt the synthesis of tRNA and 5S rRNA, which are essential for translation and ribosome function.
Match snRNA with its potential effects: Since snRNA is involved in splicing, a mutation affecting its transcription (by RNA polymerase II or III) could lead to defects in mRNA processing, resulting in improperly spliced mRNA.

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주요 개념

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

Eukaryotic RNA Polymerases

Eukaryotic cells contain three main types of RNA polymerases: RNA polymerase I (RNA pol I), RNA polymerase II (RNA pol II), and RNA polymerase III (RNA pol III). Each polymerase is responsible for transcribing different types of RNA; RNA pol I synthesizes ribosomal RNA (rRNA), RNA pol II synthesizes messenger RNA (mRNA) and some small nuclear RNAs (snRNA), and RNA pol III synthesizes transfer RNA (tRNA) and other small RNAs. Understanding the specific functions of these polymerases is crucial for analyzing the effects of mutations.
추천 영상:
가이드 코스
05:43
RNA

Mutations and Their Effects

Mutations are changes in the DNA sequence that can affect gene function. Depending on the type and location of the mutation, the effects can range from benign to detrimental, potentially leading to the loss of function of the gene product. In the context of RNA polymerases, mutations can disrupt the synthesis of specific RNA types, leading to various cellular consequences, such as impaired protein synthesis or altered gene expression.
추천 영상:
가이드 코스
03:38
Maternal Effect

Pre-mRNA Synthesis

Pre-mRNA is the initial transcript synthesized from DNA before it undergoes processing to become mature mRNA. This process is primarily facilitated by RNA pol II. If a mutation affects RNA pol II, it can lead to insufficient or absent pre-mRNA synthesis, which directly impacts the production of proteins necessary for cellular function. Understanding the relationship between RNA polymerase activity and pre-mRNA synthesis is essential for predicting the outcomes of mutations.
추천 영상:
가이드 코스
08:39
mRNA Processing
관련 실천
교과서 질문

Suppose you have a 1-kb segment of cloned DNA that is suspected to contain a eukaryotic promoter, including a TATA box, a CAAT box, and an upstream GC-rich sequence. The clone also contains a gene whose transcript is readily detectable. Your laboratory supervisor asks you to outline an experiment that will (1) determine if eukaryotic transcription factors (TF) bind to the fragment and, if so, (2) identify where on the fragment the transcription factors bind. All necessary reagents, equipment, and experimental know-how are available in the laboratory. Your assignment is to propose techniques to be used to address the two items your supervisor has listed and to describe the kind of results that would indicate binding of TF to the DNA and the location of the binding.

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교과서 질문

Assume that a mutation affects the gene for each of the following eukaryotic RNA polymerases. Match each mutation with the possible effects from the list provided. More than one effect is possible for each mutation.

Some rRNA is not synthesized.

478
views
교과서 질문

Assume that a mutation affects the gene for each of the following eukaryotic RNA polymerases. Match each mutation with the possible effects from the list provided. More than one effect is possible for each mutation.

Pre-mRNA does not have introns removed.

432
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교과서 질문

Assume that a mutation affects the gene for each of the following eukaryotic RNA polymerases. Match each mutation with the possible effects from the list provided. More than one effect is possible for each mutation.

Ribosomal RNA is not processed.

465
views
교과서 질문

Assume that a mutation affects the gene for each of the following eukaryotic RNA polymerases. Match each mutation with the possible effects from the list provided. More than one effect is possible for each mutation.

Some tRNA is not synthesized.

536
views
교과서 질문

DNA footprint protection is a method that determines whether proteins bind to a specific sample of DNA and thus protect part of the DNA from random enzymatic cleavage by DNase I. A 400-bp segment of cloned DNA is thought to contain a promoter. The cloned DNA is analyzed by DNA footprinting to help determine if it has the capacity to act as a promoter sequence. The accompanying gel has two lanes, each containing the cloned 400-bp DNA fragment treated with DNase I to randomly cleave unprotected DNA. Lane 1 is cloned DNA that was mixed with RNA polymerase II and several TFII transcription factors before exposure to DNase I. Lane 2 contains cloned DNA that was exposed only to DNase I. RNA pol II and TFIIs were not mixed with that DNA before adding DNase I. What additional genetic experiments would you suggest to verify that this region of cloned DNA contains a functional promoter?

721
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