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Ch. 10 - DNA Structure and Analysis
Klug - Concepts of Genetics  12th Edition
Klug12th EditionConcepts of Genetics ISBN: 9780135564776당신이 사용하는 게 아니라요?교과서 변경
10장, 문제 31a

A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic material. Analysis provided the following information:
The general X-ray diffraction pattern is similar to that of DNA, but with somewhat different dimensions and more irregularity.

검증된 단계별 안내
1
Step 1: Understand the context of the problem by recognizing that the organism's genetic material shows an X-ray diffraction pattern similar to DNA, which suggests a helical structure but with differences in dimensions and regularity.
Step 2: Recall that DNA's X-ray diffraction pattern is characterized by a regular, repeating helical structure, typically producing a distinct 'X' shape pattern due to its uniformity and consistent dimensions.
Step 3: Consider what differences in dimensions and irregularity might imply about the nucleic acid structure, such as variations in helix pitch, diameter, or base pairing that could affect the diffraction pattern.
Step 4: Analyze how these structural differences could influence the biological properties of the nucleic acid, including stability, replication, and interaction with proteins, by comparing to known DNA and RNA structures.
Step 5: Formulate hypotheses about the nature of this unique nucleic acid, possibly involving alternative sugar backbones, base modifications, or non-standard pairing, and design experiments to further characterize its chemical composition and biological function.

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주요 개념

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

Structure and Properties of DNA

DNA is a double-helical nucleic acid with a regular, repeating structure that produces a characteristic X-ray diffraction pattern. Its dimensions and uniformity are well-studied, serving as a reference for identifying nucleic acids. Understanding DNA’s structure helps compare and contrast with novel genetic materials.
추천 영상:

X-ray Diffraction in Molecular Analysis

X-ray diffraction is a technique used to determine the three-dimensional structure of molecules by analyzing the pattern of X-rays scattered by the sample. Differences in diffraction patterns reveal variations in molecular dimensions and regularity, aiding in identifying unique nucleic acid structures.
추천 영상:

Genetic Material Diversity in Eukaryotes

While DNA is the common genetic material in eukaryotes, some primitive or unusual organisms may use alternative nucleic acids or modified forms. Recognizing the possibility of unique genetic materials expands understanding of molecular evolution and genetic diversity.
추천 영상:
가이드 코스
09:16
Eukaryotic Transcription
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교과서 질문

One of the most common spontaneous lesions that occurs in DNA under physiological conditions is the hydrolysis of the amino group of cytosine, converting the cytosine to uracil. What would be the effect on DNA structure of a uracil group replacing cytosine?

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교과서 질문

A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic material. Analysis provided the following information:

A major hyperchromic shift is evident upon heating and monitoring UV absorption at 260 nm.

437
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교과서 질문

A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic material. Analysis provided the following information:

About 75 percent of the sugars are deoxyribose, while 25 percent are ribose.

Postulate a model for the structure of this molecule that is consistent with the foregoing observations.

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교과서 질문

Because of its rapid turnaround time, fluorescent in situ hybridization (FISH) is commonly used in hospitals and laboratories as an aneuploid screen of cells retrieved from amniocentesis and chorionic villus sampling (CVS). Chromosomes 13, 18, 21, X, and Y are typically screened for aneuploidy in this way. Explain how FISH might be accomplished using amniotic or CVS samples and why the above chromosomes have been chosen for screening.

543
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교과서 질문

A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic material. Analysis provided the following information:

Base-composition analysis reveals four bases in the following proportions: Adenine = 8%; Guanine = 37%; Xanthine = 37%; Hypoxanthine = 18%

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교과서 질문

In some organisms, cytosine is methylated at carbon 5 of the pyrimidine ring after it is incorporated into DNA. If a 5-methyl cytosine molecule is then hydrolyzed, what base will be generated?

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