Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 16, Problem 19TYK
You are trying to test your hypothesis that
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Below 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)
When DNA replication was investigated by using heavy, N15 DNA to mark the original molecules, and light, N14 DNA to mark the newly synthesized molecules, one band was found in the middle of the centrifuge column after one round of replication, and two bands were found (middle and top of column) after 2 rounds of replication. Imagine that after 1 round of replication 2 bands were found, one at the bottom and one at the top of the centrifuge column. In that case, what model of DNA replication would have been supported?
The dispersive model
The conservative model
The Franklin model
The semi-conservative model
a)
If you isolated DNA from the ear and the tail of the same mouse, would you expect the DNA, isolated form the two tissue types, to be the same? Why? (2)
b)
Provide one difference between DNA replication in eukaryotes and prokaryotes with regards to their origin(s) of replication. (1)
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Chapter 16 Solutions
Study Guide for Campbell Biology
Ch. 16 - Hershey and Chase devised an experiment using...Ch. 16 - Review the structure of DNA by labeling the...Ch. 16 - Using different colors for heavy (parental) and...Ch. 16 - Look back to Interactive Question 16.2 and label...Ch. 16 - In this diagram of bacterial DNA replication,...Ch. 16 - Draw the last Okazaki fragment being formed on the...Ch. 16 - List the successive levels of packing in a...Ch. 16 - Prob. 1SYKCh. 16 - Prob. 2SYKCh. 16 - One of the reasons most scientists thought...
Ch. 16 - Transformation involves a. the uptake of external...Ch. 16 - Prob. 3TYKCh. 16 - Which of the following most closely represents...Ch. 16 - Prob. 5TYKCh. 16 - Prob. 6TYKCh. 16 - In their classic experiment, Meselson and Stahl a....Ch. 16 - The joining of nucleotides in the polymerization...Ch. 16 - DNA polymerase is not able to begin copying a DNA...Ch. 16 - Prob. 10TYKCh. 16 - Prob. 11TYKCh. 16 - Prob. 12TYKCh. 16 - Which of the following is least related to the...Ch. 16 - Prob. 14TYKCh. 16 - Prob. 15TYKCh. 16 - Prob. 16TYKCh. 16 - Prob. 17TYKCh. 16 - Which of the following statements about telomeres...Ch. 16 - You are trying to test your hypothesis that DNA...Ch. 16 - Given the experimental procedure explained in...Ch. 16 - Prob. 21TYKCh. 16 - Biologists have learned from the technique of...
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- The reaction in DNA replication catalyzed by DNA ligase isa) Addition of new nucleotides to the leading strandb) Addition of new nucleotide to the lagging strandc) Formation of a phosphodiester bond between the 3’-OH of one Okazaki fragment and the 5’-phosphate of the next on the lagging strandd) Base pairing of the template and the newly formed DNA strandarrow_forwardYou decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E. coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the conservative model of DNA replication was correct, what is the expected distribution of DNA in the density gradient after two rounds of replication? Multiple Choice One band of intermediate density. One band of light density. One band of heavy density. One band of light density and one band of heavy density. One band of light density and one band of intermediate density.arrow_forwardOn the right of the replication fork, which DNA strand (top or bottom) will be the template for Okazaki fragment synthesis? What will be the leading strand DNA sequence from the region 1 (answer with DNA sequence)? The following origin of replication is found on E. coli chromosome. The DNA sequence of region 1 is shown below: Region I (Top strand): 5'....CTGACTGACA...3'. 5 < top ofi bottom Region 1 inarrow_forward
- The following diagrams represent DNA molecules that are undergoing replication. Draw in the strands of newly synthesized DNA and identify (a) the polarity of the newly synthesized strands, (b) the leading and lagging strands, (c) Okazaki fragments, and (d) RNA primers.arrow_forwardThe E. coli chromosome is 1.28 mm long. Under optimal conditions, thechromosome is replicated in 40 minutes.(a) What is the distance traversed by one replication fork in 1 minute?(b) If replicating DNA is in the B form (10.4 base pairs per turn), how manynucleotides are incorporated in 1 minute in one replication fork?(c) If cultured human cells (such as HeLa cells) replicate 1.2 m of DNAduring a five-hour S phase and at a rate of fork movement one-tenthof that seen in E. coli, how many origins of replication must the cellscontain?(d) What is the average distance, in kilobase pairs, between these origins?arrow_forwardWhy is DNA replication is considered a semi-discontinuous process? Explain in detail.arrow_forward
- A solution contains DNA polymerase and the Mg ²+ salts of dATP, dGTP, dCTP, and TTP. The following DNA molecules are added to aliquots of this solution. Which of them would lead to DNA synthesis? (a) A single-stranded closed circle containing 1000 nucleotide units. (b) A double-stranded closed circle containing 1000 nucleotide pairs. (c) A single-stranded closed circle of 1000 nucleotides base-paired to a linear strand of 500 nucleotides with a free 3' -OH terminus. (d) A double-stranded linear molecule of 1000 nucleotide pairs with a free 3’-OH group at each end.arrow_forwardThe following diagram represents a DNA molecule that is undergoing replication. Draw in the strands of newly synthesized DNA and identify (a) the polarity of the newly synthesized strands, (b) the leading and lagging strands, (c) Okazaki fragments, and (d) RNA primers.arrow_forwardYou decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E. coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the conservative model of DNA replication was correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?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_forwardLook at the double-stranded segment of DNA shown below. Imagine that the two strands have already been denatured, and the temperature has been decreased to an appropriate annealing temperature. Show where the two primers would anneal to the strands, then indicate the direction of extension on each new strand with an arrow. 5’--T C A G G A C G T A A G C T T G C A T A T C T C G A T G C T A A A T C A T—3’ 3’--A G T C C T G C A T T C G A A C G T A T A G A G C T A C G A T T T A G T A—5’ Primer #1: 3’ A C G A T T T 5’ Primer #2: 5’ G G A C G T A 3’arrow_forwardThe two strands of a DNA double helix can be separated by heating. If you raise the temperature of a solution containing the three DNA molecules below, in what order do you think these DNAs will "melt"? Explain 1)5’-GCGGGCCAGCCCGAGTGGGTAGCCCAGG-3’ 3’-CGCCCGGTCGGGCTCACCCATCGGGTCC-5’ 2) 5’-ATTATAAAATATTTAGATACTATATTTACAA-3’ 3’-TAATATTTTATAAATCTATGATATAAATGTT-5’ 3) 5’-AGAGCTAGATCGAT-3’ 3’-TCTCGATCTAGCTA-5’arrow_forward
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