Textbook Question
A friend says, 'Geneticists spend all their time talking about DNA, but that's silly because DNA really isn't that important in the functions of a cell.' In what ways is she right, and in what ways might she be wrong?
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Ch. 16 - How Genes Work
Freeman8th EditionBiological ScienceISBN: 9780138276263
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Table of contents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Chapter 16, Problem 7
Which of the following describes mutations? Select True or False for each statement.
T/F Point mutations can occur in any DNA sequence.
T/F Frameshift mutations can occur in any DNA sequence.
T/F Neutral mutations depend on the degeneracy of the genetic code.
T/F Deleterious mutations occur only in protein-coding sequences of DNA.
Verified step by step guidance1
Understand the concept of mutations: Mutations are changes in the DNA sequence that can occur in various forms, such as point mutations, frameshift mutations, neutral mutations, and deleterious mutations. Each type has specific characteristics and effects on the genetic code.
Analyze the first statement: 'Point mutations can occur in any DNA sequence.' Point mutations involve a single nucleotide change (e.g., substitution) and can occur in any part of the DNA, including coding and non-coding regions. Determine if this is true or false based on this definition.
Analyze the second statement: 'Frameshift mutations can occur in any DNA sequence.' Frameshift mutations result from insertions or deletions of nucleotides that are not in multiples of three, altering the reading frame of the genetic code. Consider whether this type of mutation can occur in any DNA sequence or if it is restricted to specific regions.
Analyze the third statement: 'Neutral mutations depend on the degeneracy of the genetic code.' Neutral mutations do not affect the organism's fitness and often occur due to the redundancy (degeneracy) of the genetic code, where multiple codons can code for the same amino acid. Evaluate whether this statement aligns with the concept of neutral mutations.
Analyze the fourth statement: 'Deleterious mutations occur only in protein-coding sequences of DNA.' Deleterious mutations negatively impact an organism's fitness. While they are more likely to occur in protein-coding regions, consider whether they can also occur in regulatory or non-coding regions and still have harmful effects.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Point Mutations
Point mutations are alterations in a single nucleotide base pair in the DNA sequence. They can occur in any DNA sequence, including coding and non-coding regions. These mutations can lead to changes in amino acids during protein synthesis, potentially affecting protein function.
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02:29
Mutations
Frameshift Mutations
Frameshift mutations result from insertions or deletions of nucleotides that shift the reading frame of the genetic code. This type of mutation can occur in any DNA sequence and often leads to significant changes in the resulting protein, as it alters the grouping of codons downstream of the mutation.
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08:44Types of Mutations
Types of Mutations
Mutations can be classified as neutral, deleterious, or beneficial based on their effects on the organism. Neutral mutations do not affect fitness and often occur in non-coding regions or result in synonymous changes. Deleterious mutations can disrupt protein function and may occur in both coding and non-coding sequences, not limited to protein-coding regions.
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Related Practice
Textbook Question
Draw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.)
(b) Suppose a mutant strain can survive if substrate 5 is added to the growth medium, but it cannot grow if substrates 1, 2, 3, or 4 are added. Which enzyme in the pathway is affected in this mutant?
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Textbook Question
Draw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.)
(a) Suppose a mutation made the gene for enzyme C nonfunctional. What molecule would accumulate in the affected cells?
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Textbook Question
A minimal genetic code requires only 21 codons—one for each amino acid, and one for a stop signal. Given this, what advantage might be offered by having a code with 64 codons?
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Textbook Question
Explain what's wrong with this statement: All point mutations change the genotype and the phenotype.
Textbook Question
Which of the following describes the experimental strategy that was used to decipher the genetic code?
a. Comparing the amino acid sequences of proteins with the base sequence of their genes
b. Analyzing the sequence of RNAs produced from known DNA sequences
c. Analyzing mutants that changed the code
d. Examining the polypeptides produced when RNAs with particular sequences were translated
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