Chemistry for Today: General, Organic, and Biochemistry
9th Edition
ISBN: 9781305960060
Author: Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher: Cengage Learning
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Textbook Question
Chapter 21, Problem 21.16E
What is a chromosome? How many chromosomes are in a human cell? What is the approximate number of genes in a human cell?
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A forensic scientist is trying to find out the number of adenine bases in the DNA sample that he obtained from a crime scene. What can he assume about the number of adenine? O The number of adenine bases will be equal to the number of guanine bases. O The number of adenine bases will be equal to the total of all the other bases. O The number of adenine bases will be equal to the number of thymine bases. O The number of adenine bases will be half of the number of cytosine bases.
Biochemistry Molecular
1. How did scientists discover the genetic
code?
2.Is the genetic code universal?
3.Codons that code for 61 amino acids.
Kinds of amino acids 20 pieces. How is
yours analysis of the relationship between
these two sentences?
Section 1
Genes code for proteins that determine the phenotypes of individuals. Individuals inherit genes from parents.
What is the relationship between genes and chromosomes?
O Chromosomes are independent of genes.
O Chromosomes are present inside genes.
O Genes are made up of chromosomes.
O Genes are present on chromosomes.
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Chapter 21 Solutions
Chemistry for Today: General, Organic, and Biochemistry
Ch. 21 - What is the principal location of DNA within the...Ch. 21 - Which pentose sugar is present in DNA? In RNA?Ch. 21 - Prob. 21.3ECh. 21 - Prob. 21.4ECh. 21 - Prob. 21.5ECh. 21 - Prob. 21.6ECh. 21 - Prob. 21.7ECh. 21 - Identify the 3 and 5 ends of the DNA segment...Ch. 21 - Prob. 21.9ECh. 21 - Prob. 21.10E
Ch. 21 - Describe the role of hydrogen bonding in the...Ch. 21 - How many total hydrogen bonds would exist between...Ch. 21 - How many total hydrogen bonds would exist between...Ch. 21 - Prob. 21.14ECh. 21 - A strand of DNA has the base sequence GATTCA....Ch. 21 - What is a chromosome? How many chromosomes are in...Ch. 21 - Prob. 21.17ECh. 21 - What is a replication fork?Ch. 21 - Prob. 21.19ECh. 21 - List the steps involved in DNA replication.Ch. 21 - What enzymes are involved in DNA replication?Ch. 21 - In what direction is a new DNA strand formed?Ch. 21 - Prob. 21.23ECh. 21 - Prob. 21.24ECh. 21 - Prob. 21.25ECh. 21 - How does the sugar-phosphate backbone of RNA...Ch. 21 - Compare the secondary structures of RNA and DNA.Ch. 21 - Briefly describe the characteristics and functions...Ch. 21 - Must the ratio of guanine to cytosine be 1:1 in...Ch. 21 - What are the two important regions of a tRNA...Ch. 21 - Prob. 21.31ECh. 21 - In the flow of genetic information, what is meant...Ch. 21 - Prob. 21.33ECh. 21 - Write the base sequence for the mRNA that would be...Ch. 21 - Prob. 21.35ECh. 21 - What is the relationship among exons, introns, and...Ch. 21 - What is a codon?Ch. 21 - For each of the following mRNA codons, give the...Ch. 21 - Describe the experiment that allowed researchers...Ch. 21 - Which of the following statements about the...Ch. 21 - The -chain of hemoglobin is a protein that...Ch. 21 - Prob. 21.42ECh. 21 - Prob. 21.43ECh. 21 - Prob. 21.44ECh. 21 - Prob. 21.45ECh. 21 - Prob. 21.46ECh. 21 - Prob. 21.47ECh. 21 - Prob. 21.48ECh. 21 - Prob. 21.49ECh. 21 - Prob. 21.50ECh. 21 - Prob. 21.51ECh. 21 - Prob. 21.52ECh. 21 - Prob. 21.53ECh. 21 - Prob. 21.54ECh. 21 - Prob. 21.55ECh. 21 - Prob. 21.56ECh. 21 - Prob. 21.57ECh. 21 - Prob. 21.58ECh. 21 - Prob. 21.59ECh. 21 - Genetic engineering shows great promise for the...Ch. 21 - Prob. 21.61ECh. 21 - Prob. 21.62ECh. 21 - Prob. 21.63ECh. 21 - Prob. 21.64ECh. 21 - Prob. 21.65ECh. 21 - Prob. 21.66ECh. 21 - How does the DNA content determine what reactions...Ch. 21 - What would be the ramifications if DNA were single...Ch. 21 - Prob. 21.69ECh. 21 - Prob. 21.70ECh. 21 - Explain the function and importance of each of the...Ch. 21 - Prob. 21.72ECh. 21 - Which base is found in DNA but not in RNA? a....Ch. 21 - Which of the following best describes tRNA? a. It...Ch. 21 - Which of the following is the site of protein...Ch. 21 - In messenger RNA, a codon contains how many...
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- There are 41 = 4 mononucleotides of DNA, there are 42 = 16 possible dinucleotides, and so on. If a segment of DNA were completely random, how many nucleotides long would it need to be in order to have one possible sequence for each person on Earth (currently about 7.5 billion people)?arrow_forwarda Describe the three components of a nucleotide. b How does the structure of an RNA nucleotide differ from that of a DNA nucleotide?arrow_forwardGenetic engineering shows great promise for the future but has been controversial at times. Discuss with some classmates the pros and cons of genetic engineering. List two benefits and two concerns that come from your discussion.arrow_forward
- Watson and Crick determined that the DNA molecule has two helical strands. Each strand is made up of , which consist of a base, a deoxyribose, and a phosphate group linked together. What word most correctly fills in the blank in the preceding statement? A.amino acids b.monosaccharides c.fatty acids d.nucleotidesarrow_forwardA segment of DNA has 18 base pairs. It has 7 cytosines in the segment.a. How many thymines are in the segment? b. How many guanines are in the segment?arrow_forwardDNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. It contains the biological instructions that make each species unique. DNA, along with the instructions it contains, is passed from adult organisms to their offspring during reproduction. Nearly every cell in a person's body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA). The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people. The order, or sequence, of these bases determines the information available for building and maintaining an organism, similar to the way in which letters of the alphabet appear in a certain order to form words and sentences. DNA bases…arrow_forward
- What is the BEST definition of a genetic mutation? It is any damage to any DNA. It is a break in a DNA strand. It is any chemical change or physical change to DNA. It is a chemical change to a gene that affects the primary structure of a protein.arrow_forwardC—1s22s22p13s1—representsarrow_forwardIs genetic engineering a pure scientific process or it is indeed on act of humans playing like God? Explain.arrow_forward
- Which molecules are the main molecules associated with energy? a. carbohydrates b. lipids c. nucleic acids d. proteinsarrow_forward3 amino acids joined together by two peptide bonds.a. Dipeptideb. Tripeptidec. Tetrapeptided. Polypeptide An amino acid that can form disulfide bondsa. Cysteineb. Methioninec. Cystined. Serinearrow_forwardAntibodies in the human immune system can identify approximately 108 different molecules. Which one of the following is true?A. This diversity is generated from 108 different immunoglobin genes.B. Most of these antibodies recognize self-antigens.C. Most of these antibodies recognize proteins. D. Most of these antibodies recognize small organic molecules.E. There are really just a small number of antibodies, each of which can bind to many different antigens.The antibiotic penicillin is a small molecule that does not induce antibody formation. However, penicillin binds to serum proteins and forms a complex that in some people induces antibody formation resulting in an allergic reaction. Penicillin is thereforeA. an antigenB. a haptenC. an immunogenD. both an antigen and a haptenarrow_forward
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Biomolecules - Protein - Amino acids; Author: Tutorials Point (India) Ltd.;https://www.youtube.com/watch?v=ySNVPDHJ0ek;License: Standard YouTube License, CC-BY