Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 6, Problem 23P
Replicating structures in DNA can be observed in the electron microscope. Regions being replicated appear as bubbles.
| a. | Assuming bidirectional replication, how many origins of replication are active in this DNA molecule? |
| b. | How many replication forks are present? |
| c. | Assuming that all replication forks move at the same speed, which origin of replication was activated last? |
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Students have asked these similar questions
Consider a DNA molecule with the following structure
a. if during replication , the T at position 4 is read as an A resulting in a misincorporation in the new DNA strand . If the misincorporation is not repair , draw or write the results of the second round of replication
b. After the second round of replication , what specific type of point mutation is now permanent in the DNA sequence ?
c. List the two cellular mechanisms that failed to prevent the establishment of this permanent mutation .
In Semi conservative replication:
A. After one round of replication of a single molecule of DNA, one DNA molecule will be produced that contains two parental strands of DNA and one DNA molecule will be
produced that contains two new (or de novo) strands.
B. After one round of replication of a single molecule of DNA, two resulting DNA molecules will be produced both of which contain a mix of both parental and new
DNA interspersed on every strand of DNA
C. After two rounds of replication of a single molecule of DNA, two resulting DNA molecules will contain both a parental strand and a new strand of DNA and the other
two resulting DNA molecules will contain all new (or de novo) DNA
D. After two rounds of replication of a single molecule of DNA, one resulting DNA molecule will contain 2 parental strands of DNA and the other three resulting DNA
molecules will contain all new (or de novo) DNA
E. A and C
F. B and D
(a) Eukaryotic DNA replication is more complex than prokaryotic replication. Give one reason why this should be so.
(b) Why might eukaryotic cells need more kinds of DNA polymerases than bacteria?
Chapter 6 Solutions
Genetics: From Genes to Genomes
Ch. 6 - Griffith, in his 1928 experiments, demonstrated...Ch. 6 - Griffith, in his 1928 experiments, demonstrated...Ch. 6 - During bacterial transformation, DNA that enters a...Ch. 6 - Nitrogen and carbon are more abundant in proteins...Ch. 6 - If 30 of the bases in human DNA are A, a what...Ch. 6 - Which of the following statements are true about...Ch. 6 - Imagine you have three test tubes containing...Ch. 6 - What information about the structure of DNA was...Ch. 6 - A portion of one DNA strand of the human gene...Ch. 6 - When a double-stranded DNA molecule is exposed to...
Ch. 6 - A particular virus with DNA as its genetic...Ch. 6 - The underlying structure of DNA is very simple,...Ch. 6 - Prob. 13PCh. 6 - Bacterial transformation and bacteriophage...Ch. 6 - The CAP protein is shown bound to DNA in Fig....Ch. 6 - In Meselson and Stahls density shift experiments...Ch. 6 - When Meselson and Stahl grew E. coli in 15N medium...Ch. 6 - If you expose human tissue culture cells for...Ch. 6 - Draw a replication bubble with both replication...Ch. 6 - a. Do any strands of nucleic acid exist in nature...Ch. 6 - As Fig. 6.21 shows, DNA polymerase cleaves the...Ch. 6 - The bases of one of the strands of DNA in a region...Ch. 6 - Replicating structures in DNA can be observed in...Ch. 6 - Indicate the role of each of the following in DNA...Ch. 6 - Draw a diagram of replication that is occurring at...Ch. 6 - Figure 6.18 depicts Watson and Cricks initial...Ch. 6 - Researchers have discovered that during...Ch. 6 - A DNA synthesizer is a machine that uses automated...Ch. 6 - Bacterial cells were coinfected with two types of...Ch. 6 - A yeast strain with a mutant spo11- allele has...Ch. 6 - Imagine that you have done a cross between two...Ch. 6 - The Neurospora octad shown came from a cross...Ch. 6 - From a cross between e f g and e f g strains of...Ch. 6 - In Step 6 of Fig. 6.27, the resolvase enzyme...Ch. 6 - Figure 6.31shows four potential outcomes of...Ch. 6 - Each of the substrates for site-specific...Ch. 6 - Prob. 37PCh. 6 - Suppose that you could inject a wild-type mouse...Ch. 6 - C31 is a type of bacteriophage that infects...Ch. 6 - Cre is a recombinase enzyme encoded by a gene in...Ch. 6 - Like Cre/loxP recombination, site-specific...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Shown below is a double stranded DNA molecule.Replicate this DNA and show the products formed from this replication. In your answer, indicate which strands are the new daughter strands (mark with D and in a different color) and which strands are the already existing parent strands (mark with P as shown below). Label the 5’ and 3’ ends of all DNA. HINT: You should have 2 double-stranded DNA molecules after replication. P: 5’ CATAGGATTCCTACG 3’ P: 3’ GTATCCTAAGGATGC 5’arrow_forwardA. In NOT more than 200 words, explain how the double-helical structure of DNA suggests a mechanism for DNA replication? B. In NOT more than 200 words, explain the special mechanism used to replicate chromosome ends?arrow_forwardBriefly discuss the pros and cons of having a nucleoid (as bacteria do) versus a double nuclear membrane surrounding the DNA (as in eukaryotes). List and explain three reasons why DNA replication is very accurate.arrow_forward
- Suppose that replication is initiated in a medium containing moderately radioactive tritiated thymine. After a few minutes of incubation, the bacteria are transferred to a medium containing highly radioactive tritiated thymidine. Sketch the autoradiographic pattern that would be seen for (a) undirectional replication and (b) bidirectional replication, each from a single origin.arrow_forwardBelow is a diagram of DNA replication as currently believed to occur in E. coli. From specific points, arrows are provided that lead to numbers. Answer the questions below relating to the locations specified by the numbers. (02) What end (5’ or 3’) of the molecule is here? (State which) What enzyme is probably functioning here to deal with supercoils in the DNA? What enzyme is probably functioning here to unwind the DNA? What nucleic acid is probably depicted here? What are these short DNA fragments usually called? What enzyme probably functions here to couple these two newly synthesized fragments of DNA? Is this strand the leading or lagging strand? What end (5’ or 3’) of the molecule is here? (State which)arrow_forwardYou are studying a colony of cells and determine that some of these cells have a mutated DNA polymerase I that results in loss of function of this enzyme. A) What will the effect of the mutation in DNA polymerase I be on DNA replication? In your answer make sure to describe what would be observed in the leading and lagging strand and explain your reasoning. B) Will this mutation in DNA polymerase I have an impact on another step in DNA replication? In your answer make sure to indicate whether DNA replication will be impacted or not. If it is not, explain why. If it is impacted, then describe the step that is impacted and name the molecule or enzyme involved.arrow_forward
- Assume a deletion occurs in a gene that encodes DNA polymerase I and no functional DNA polymerase I is produced. What will be the most likely consequence of this mutation? The DNA would not exist in a supercoiled state. There would be no RNA primers laid down. The DNA will not be able to unwind to initiate replication. The DNA strands would contain pieces of RNA. There would be no DNA replication on the leading or lagging strands.arrow_forwardAssume that a certain bacterial chromosome has one origin of replication. Under some conditions of rapid cell division, replication could start from the origin before the preceding replication cycle is complete. How many replication forks would be present under these conditions?arrow_forwardWhy is DNA replication is considered a semi-discontinuous process? Explain in detail.arrow_forward
- Spontaneous deamination of cytosine bases in DNA takes place at low but measurable frequency. Cytosine is converted into uracil by loss of its amino group. After this conversion, which base pair occupies this position in each of the daughter strands resulting from one round of replication? Two rounds of replication? (a) How many different 8-mer sequences of DNA are there? (Hint: There are 16 possible dinucleotides and 64 possible trinucleotides.) We can quantify the information- carrying capacity of nucleic acids in the following way. Each position can be one of four bases, corresponding to two bits of information (2² = 4). Thus, a chain of 5100 nucleotides corresponds to 2 × 5100 = 10,200 bits, or 1275 bytes (1 byte =8 bits). (b) How many bits of information are stored in an 8-mer DNA sequence? In the E. coli genome? In the human genome? (c) Compare each of these values with the amount of information that can be stored on a computer compact disc, or CD (about 700 megabytes).arrow_forwardExplain the function of an origin of replication in the replication of DNA, and know how the prokaryotic and eukaryotic cells differ in terms of the number of origins of replication on each chromosome. Explain why replication is different on the two strand at a replication fork, including: how these differences are related to the fact that DNA strands are synthesized in a 5’ to 3’ direction. what is meant by the terms bidirectional replication, and replication bubble. the role of the leading strand, lagging strand, Okazaki fragments, continuous and discontinuous replicationarrow_forwardHow is the DNA unwound at the replication fork? What effect does this have on the DNA upstream of the fork, and how does the cell deal with this effect? b. Sliding clamps are topologically-closed rings that can encircle the DNA double helix. How, then, are they able to get on and off the DNA? What purpose is served by this striking topology?arrow_forward
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