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According to Chargaff's rule, if the DNA of a species contains 20% adenine, what percent of guanine will it contain?

According to Chargaff's rule, if the DNA of a species contains 20% adenine, what percent of guanine will it contain?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Title: Application of Chargaff's Rule in DNA Composition --- ### Question: According to Chargaff's rule, if the DNA of a species contains 20% adenine, what percent of guanine will it contain? --- ### Options: - **20%** - **30%** - **60%** - **None of the above** --- ### Explanation: Chargaff's rule states that in any double-stranded DNA molecule, the amount of adenine (A) equals the amount of thymine (T), and the amount of guanine (G) equals the amount of cytosine (C). This is often simplified to the following relationships: - A = T - G = C If adenine makes up 20% of the DNA, then thymine must also make up 20%. This accounts for 40% of the DNA. The remaining 60% must be made up equally of guanine and cytosine. Therefore, guanine constitutes 30% of the DNA. To summarize: - Adenine (A): 20% - Thymine (T): 20% - Guanine (G): 30% - Cytosine (C): 30% The correct answer is **30%**. To ensure a thorough understanding, remember the foundational proportional relationships detailed by Chargaff’s findings, which can be essential for various applications in genetics and molecular biology. --- Feel free to explore more questions related to DNA structure and composition in our Genetics section to solidify your understanding of these critical concepts.
Transcribed Image Text:Title: Application of Chargaff's Rule in DNA Composition --- ### Question: According to Chargaff's rule, if the DNA of a species contains 20% adenine, what percent of guanine will it contain? --- ### Options: - **20%** - **30%** - **60%** - **None of the above** --- ### Explanation: Chargaff's rule states that in any double-stranded DNA molecule, the amount of adenine (A) equals the amount of thymine (T), and the amount of guanine (G) equals the amount of cytosine (C). This is often simplified to the following relationships: - A = T - G = C If adenine makes up 20% of the DNA, then thymine must also make up 20%. This accounts for 40% of the DNA. The remaining 60% must be made up equally of guanine and cytosine. Therefore, guanine constitutes 30% of the DNA. To summarize: - Adenine (A): 20% - Thymine (T): 20% - Guanine (G): 30% - Cytosine (C): 30% The correct answer is **30%**. To ensure a thorough understanding, remember the foundational proportional relationships detailed by Chargaff’s findings, which can be essential for various applications in genetics and molecular biology. --- Feel free to explore more questions related to DNA structure and composition in our Genetics section to solidify your understanding of these critical concepts.
**Question:** Which phase of Mitosis is described by the following statement? Chromosomes condense and become visible. **Options:** - ☐ prophase - ☐ interphase - ☐ telophase - ☐ metaphase - ☐ anaphase
Transcribed Image Text:**Question:** Which phase of Mitosis is described by the following statement? Chromosomes condense and become visible. **Options:** - ☐ prophase - ☐ interphase - ☐ telophase - ☐ metaphase - ☐ anaphase
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