Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 4, Problem 15PIAT
Summary Introduction
To review:
The Chargaff’s observations helped Watson and Crick to propose the complementary base pairing in double-stranded DNA model. The similar ratios of
Introduction:
Watson and Crick used Chargaff’s data of 1:1 between adenine:thymine (A:T) and guanine:cytosine (G:C) to establish the concept of complementary base pairing by DNA (deoxyribonucleic acid) double-helix model.
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Students have asked these similar questions
Watson and Crick used an approach called model building to deduce the structure of the DNA double helix.How does this differ from the more conventional experimental approach that is undertaken in a research laboratory? In this regard, why was the experiment of Meselsonand Stahl considered to be of such critical importance?
In the Watson-Crick model for the DNA double helix (B form) the A-T and G-C base pairs share all
but one of the following properties. Which is the exception?
None of the proton-binding groups in the purine and pyrimidine bases is in its charged or ionized form.
The plane of the base pair is roughly perpendicular to the axis of the helix in each case.
The number of hydrogen bonds formed between the two bases of the base pair is the same.
O The distance between the two glycosidic (base-sugar) bonds is the same in both base pairs, within a few
tenths of an angstrom.
State the properties of the Watson-Crick model of DNA in the following categories:
a) number of polynucleotide chains
b) polarity (strand direction running same or opposite
c) bases on interior or exterior of molecule
d) sugar/phosphate on interior or exterior of molecule
e) which bases pair with which
f) right- or left-handed helix
Chapter 4 Solutions
Biological Science (6th Edition)
Ch. 4 - What are the four nitrogenous bases found in RNA?...Ch. 4 - 2. What determines the primary structure of a DNA...Ch. 4 - 3. Which of the following describes the synthesis...Ch. 4 - Prob. 4TYKCh. 4 - Prob. 5TYUCh. 4 - Prob. 6TYUCh. 4 - What would be the sequence of the strand of DNA...Ch. 4 - 8. According to the RNA world model, a ribozyme...Ch. 4 - Make a concept map (see BioSkills 12 ) that...Ch. 4 - Prob. 10TYPSS
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- According to the Watson- Crick model how many polynucleotide chains does a DNA molecule have?arrow_forwardWhich of the following statements DOES NOT apply to the Watson and Crick model of DNA? a. The two strands of the DNA helix are anti-parallel. b. The distance between the strands of the helix is 20 angstroms (A). c. The framework of the helix consists of sugar-phosphate units of the nucleotides. d. The two strands of the helix are held together by covalent bonds. e. The purines are attracted to the pyrimidines. ...Explain your answer.arrow_forwardX-ray was used by Rosalind Franklin and Maurice Wilkins to study the molecular structure of DNA. Why is their finding not accepted by Watson and Crick? Explain.arrow_forward
- Recall the DNA’s three-dimensional model. The DNA is a right-handed helix wherein one complete 3600 turn covers a distance of 34 angstroms (Å) or 3.4 nm and 10 base pairs. As a result, the base pairs are separated by a distance of approximately 3.4 Å. The diameter of the Watson and Crick DNA molecule is 20 Å.Calculate the average number of nucleotide pairs (or base pairs) per micrometer of DNA double helix according to the dimension mentioned above. Round off your answer to the nearest whole number. Note also that 1 micrometer = 10,000 angstroms.arrow_forwardDraw the structure of the following DNA sequence (5’-AG-3’) hydrogen bonded through Watson-Crick base pairing to the complementary PNA sequence (Cterminus-TC-Nterminus). Make sure to include both the sugar phosphate backbone of your DNA sequence, as well as the peptide backbone of your PNA sequence. DNA: 5’-AG-3’ PNA: (C)-TC-(N)arrow_forwardYou have a sample of genetic material. The nitrogenous base content is 29% guanine. a) If the sample is DNA, what are the amounts of the other bases? Explain your thought process b) Why can you not determine the amounts of the other bases if the sample is RNA? Explain your answer c) How did Watson and Crick make use the relationships between base pairs as they constructed the model for DNA?arrow_forward
- Which positions in the purine ring of a purine nucleotide in DNAhave the potential to form hydrogen bonds but are not involved in Watson-Crick base pairing?arrow_forwardBiochemist Erwin Chargaff was the first to note that, in DNA, [A] = [T] and [G]= [C], equalities now called Chargaff’s rule. Using this rule, determine the percentages of all the bases in DNA that is 20% thymine.arrow_forwardAs shown, five DnaA boxes are found within the origin of replication in E. coli. Take a look at these five sequences carefully. A. Are the sequences of the five DnaA boxes very similar to each other? (Hint: Remember that DNA is double-stranded; think about these sequences in the forward and reverse directions.) B. What is the most common sequence for a DnaA box? In other words, what is the most common base in the first position, second position, and so on until the ninth position? The most common sequence is called the consensus sequence. C. The E. coli chromosome is about 4.6 million bp long. Based on random chance, is it likely that the consensus sequence for a DnaA box occurs elsewhere in the E. coli chromosome? If so, why aren’t there multiple origins of replication in E. coli?arrow_forward
- Let’s assume the linker region of DNA averages 54 bp in length. How many molecules of H2A would you expect to find in a DNA sample that is 46,000 bp in length?arrow_forward1) Which statement below explains the trick in sanger sequencing that produces fluorescently labeled fragments at every length within a fragment? a) When synthesizing a copy of the DNA to be sequenced, a high concentration of fluorescently labeled dideoxynucleotides (ddNTPs) are used along with a low concentration of deoxynucleotides (dNTPs) to produce the chain termination events at every location in the sequence. b) When synthesizing a copy of the DNA to be sequenced, fluorescently labeled dideoxynucleotides (ddNTPs) are used instead of deoxynucleotides (dNTPs) to produce the chain termination events at every location in the sequence. c) When synthesizing a copy of the DNA to be sequenced, a low concentration of fluorescently labeled dideoxynucleotides (ddNTPs) are used along with a high concentration of deoxynucleotides (dNTPs) to produce the chain termination events at every location in the sequence. d) When synthesizing a copy of the DNA to be sequenced, fluorescently labeled…arrow_forwardBelow is a sequence of 540 bases from a genome. What information would you use to find the beginnings and ends of open reading frames? How many open reading frames can you find in this sequence? Which open reading frame is likely to represent a protein- coding sequence, and why? Which are probably not functioning protein-coding sequences, and why? Note: for simplicitys sake, analyze only this one strand of the DNA double helix, reading from left to right, so you will only be analyzing three of the six reading frames shown in Figure 19.4.arrow_forward
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