Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 12, Problem 1AC
Summary Introduction
To determine: Whether organisms would have more precise genetic instructions or more different genes if there were six
Introduction: Deoxy ribonucleic acid (DNA) is the genetic material of most organisms that contain coded genetic information in the form of nucleotides. Nucleotides are made up of a phosphate group, ribose sugar, and a nitrogenous base.
Summary Introduction
To determine: Whether length of the gene would be same, shorter, or longer than typical gene on Earth.
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Refer to Figure 2 and compare this with the DNA model in Figure 1.
a. In what ways are they similar?
b. In what ways are they different?
c. What is the biological significance of such differences? Why is the DNA referred to as the genetic material?
A researcher sequences the genome of a variety of bacterial and eukaryotic cells. She finds that the bacterial genome is smaller, but that there are more genes for a given number of base pairs in the eukaryotic cells. In other words, there are fewer genes per unit of length of DNA in the eukaryotic cells. What do you predict she will find if she examines the DNA more closely?
A. All of the bacterial DNA consists of coding sequences, but this is not true of the eukaryotic DNA.
B. There are more repetitive sequences in the eukaryotic DNA than in the bacterial DNA.
C. There are densely packed genes in the eukaryotic DNA that were not immediately distinguishable during the first analysis.
D. The bacteria have larger quantities of noncoding DNA than the eukaryotic cells.
Please use information from the text below and your knowledge of biology to answer the final two (2) questions.
In 2003, as a result of the Human Genome Project, the complete sequence of all the bases in human DNA was released to the public. Although knowing the entire sequence of bases has proven valuable, scientists are currently working to map genes. Mapping genes involves determining the exact location of each gene. Since much of human DNA does not code for a protein, it is challenging to figure out which segments are actual genes. Often, scientists look at the percent composition of bases in a segment of DNA. If the segment of DNA has a large percentage of C and G bases (together over 50%), it is likely that it is a gene and codes for a protein.
9. A scientist analyzed the bases in a segment of DNA from a human skin cell to determine if it codes for a protein. The base A (Adenine) is 11% of the bases in this segment of DNA. Calculate the percentage of bases that would be C…
Chapter 12 Solutions
Biology
Ch. 12.1 - Which do you think would be more difficult to...Ch. 12.1 - If viral genetic material had the same structure...Ch. 12.1 - Prob. 1CYLCh. 12.1 - Prob. 2CYLCh. 12.2 - Muscles, Mutations, and Myostatin The sequence of...Ch. 12.2 - Prob. 1CYLCh. 12.3 - describe the process of DNA replication, including...Ch. 12.3 - explain why DNA replication is called...Ch. 12.3 - Muscles, Mutations, and Myostatin "Double-muscled"...Ch. 12.4 - How Much Genes Influence Athletic Prowess?
Ch. 12.4 - explain what mutations are and how they occur?Ch. 12.4 - explain why mutations are rare?Ch. 12.4 - describe the different types of mutations?Ch. 12.4 - Prob. 1TCCh. 12 - If a parental DNA strand has the base sequence...Ch. 12 - Prob. 2MCCh. 12 - Prob. 3MCCh. 12 - The rungs of the DNA double helix consist of a....Ch. 12 - Prob. 5MCCh. 12 - Prob. 1FIBCh. 12 - Prob. 2FIBCh. 12 - Prob. 3FIBCh. 12 - Prob. 4FIBCh. 12 - Prob. 5FIBCh. 12 - Prob. 6FIBCh. 12 - Prob. 1RQCh. 12 - Prob. 2RQCh. 12 - Describe the structure of DNA. Where are the...Ch. 12 - Prob. 4RQCh. 12 - Describe the process of DNA replication.Ch. 12 - How do mutations occur? Describe the principal...Ch. 12 - Prob. 1ACCh. 12 - Genetic information is encoded in the sequence of...
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- Please use information from the text below and your knowledge of biology to answer the final two (2) questions. In 2003, as a result of the Human Genome Project, the complete sequence of all the bases in human DNA was released to the public. Although knowing the entire sequence of bases has proven valuable, scientists are currently working to map genes. Mapping genes involves determining the exact location of each gene. Since much of human DNA does not code for a protein, it is challenging to figure out which segments are actual genes. Often, scientists look at the percent composition of bases in a segment of DNA. If the segment of DNA has a large percentage of C and G bases (together over 50%), it is likely that it is a gene and codes for a protein. 10. Is it likely this segment of DNA codes for a protein? State 'yes' or 'no' AND support your answer using information from the text.arrow_forwardThe human genome contains 3 billion nucleotides arranged in a vast array of sequences. What is the minimum length of a DNA sequence that will, in all probability, appear only once in the human genome? You need consider only one strand and may assume that all four nucleotides have the same probability of appearance.arrow_forwardE. How many nucleotides would be required to generate a polypeptide that is 15 amino acids long? This requires knowing how many nucleotides of DNA code for one amino acid. F. Assuming that there are between 20,000-25,000 genes in the human genome, do you think there are 1) fewer, 2) approximately the same number, or 3) more proteins in the human genome? Explain your answer.arrow_forward
- You have sequenced the genome of the bacterium Salmonella typhimurium and find a protein that is 100 percent identical to a protein in the bacterium Escherichia coli. When you compare nucleotide sequences of the S. typhimurium and E. coli genes, you find that their nucleotide sequences are only 87 percent identical. How would you interpret the observations? Please make sure to select ALL correct answer options. Because genetic code is redundant, changes in the DNA nucleotide sequence can occur without change to its encoded protein. Due to the flexibility in the third positions of most codons, the DNA sequence can accumulate changes without affecting protein structure. Natural selection will eliminate many deleterious amino acid changes. This will reduce the rate of change in the amino acid sequence and lead to sequence conservation of the proteins. Protein sequences are expected to evolve and…arrow_forwardIf you are given a sample of chromosomal DNA, what experiment could you perform to determine whether the DNA is prokaryotic or eukaryotic? What would your hypothesis be and describe how your expected results would be supported or not supported?arrow_forwardThe human genome (3.4 Gb) would be 2.3 metres long if stretched linearly. In not more than 200 words, explain how a genome of this size is fit into a cell of minuscule proportions. You may add a diagram to your answer.arrow_forward
- You have sequenced the genome of the bacterium Salmonella typhimurium and find a protein that is 100 percent identical to a protein in the bacterium Escherichia coli. When you compare nucleotide sequences of the S. typhimurium and E. coli genes, you find that their nucleotide sequences are only 87 percent identical. How would you interpret the observations? Please make sure to select ALL correct answer options. Because genetic code is redundant, changes in the DNA nucleotide sequence can occur without change to its encoded protein. Due to the flexibility in the third positions of most codons, the DNA sequence can accumulate changes without affecting protein structure. Natural selection will eliminate many deleterious amino acid changes. This will reduce the rate of change in the amino acid sequence and lead to sequence conservation of the proteins. Protein sequences are expected to evolve and diverge more slowly than the genes that encode them.arrow_forwardThe image below shows the base cytosine and a methylated form of cytosine that occurs frequently in the human genome. Use your knowledge of DNA structure to answer the following question: a) Does methylation of cytosine affect its ability to base-pair with guanine? Explain b) Could methylation of cytosine affect the binding of a protein that interacts with a C-G base-pair in the major groove? Explain your answer.arrow_forwardNeema wants to determine whether or not the nucleus of a cell differs in the chemical compounds they contain or not from species to species. She is planning on working with the nucleus of a human and the nucleus of a mouse. She has removed all of the DNA from each nucleus, then has selected and isolated one DNA fragment from each species. What results can Neema expect if she takes the human DNA fragment and inserts it into the mouse nucleus and then inserts the mouse DNA fragment into the human nucleus? Use your knowledge of DNA replication to answer.arrow_forward
- Shown below is a DNA coding strand. A base (*G*) mutates to Adenine (A). What will be the resulting amino acid sequence as a result of the mutation? What type of mutation occured? Hint: Determine the template, then first determine the amino acid sequence before the mutation, and then determine the amino acid sequence after the mutation. Show how you got your answer. 5' T-A-C-T-T-C-C-A-*G*-C-C-G-C-T-C 3'arrow_forwardAn analysis is performed to determine the proportions of each of the four nucleotide bases in the DNA of several tissue samples from various species. The results appear in the table. Human Chicken Yeast E. coli % Adenine % Guanine (A) (G) 31 20 28 21 32 18 26 25 % Thymine % Cytosine (T) 30 29 33 24 Which conclusions can be drawn from this data? (C) 19 22 17 25 The proportion of G is roughly equal to the proportion of C. The proportion of A is roughly equal to the proportion of T. The proportion of pyrimidines is roughly equal to the proportion of purines. The proportion of A-T base pairs is roughly equal to the proportion of G-C base pairs.arrow_forwardIf 4% of human and chimpanzee DNA differs, how many base pairs differ between the two species? (Hint: The human genome contains 3.2 billion base pairs of DNA.) Is this a large or a small difference? Explain your reasoning.arrow_forward
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