4. The image below is based on the Meselson Stahl experiment where bacteria are grown in 15N and movedto 14N.Please match the tube in the image to the descriptors a-ea) DNA from E. coli grown in 15Ntest tube 1test tube 2test tube 3test tube 4test tube 5b) DNA from E. coli grown in 14Nc) A 1:1 mixture of DNA from cellsgrown in 14N and cells grown in 15Nd) A 1:1 mixture of DNA grown in 14Nand 15N, heated and allowed to re-anneale) DNA containing one strand of 15Nand one strand of 14N

The Meselson-Stahl experiment showed that DNA replication is a semiconservative process. In this…

Answered: 4. The image below is based on the…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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1 2. 3. Two different cultures of Escherichia coli bacteria were inoculated onto nutrient agar plates. One culture was transformed with pGLO plasmid and the other culture was not. All of the plates shown above are illuminated with ultraviolet light. • Which plate was inoculated with E.coli+PGLO bacteria and included ampicillin antibiotic but did not include arabinose? • Which plate was inoculated with E.coli+pGLO bacteria and included both ampicillin antibiotic and arabinose. • What would you expect to observe on a plate that included ampicillin and was inoculated with E. coli minus (without) PGLO plasmid?
5 strains of E. coli are isolated. They may be mutated on the ara, mal, leu and pro genes, and only these 4 genes. The 5 strains (E1 to E5) are tested on 5 different media and colonies are observed the next day. Rich Media (Lb) E5 E4 E1 E2Ⓡ E3 MM + Mal+Leu E5 E4 X ● E1 E5 X MM + Mal E4 X X E1 E3 E2 E5 ✪✪ E2 E4 ● E1 E5 MM + Mal+Leu +Pro E2 E3 MM + Ara E4 X X E1 E3 E2 X X Colonies are indicated by a black dot, absence of a colony is indicated by a cross. 1) Determine the genotypes of the 5 bacterial strains (E1 - E5)
(a) Describe the actions with reason that should be taken under the following situations: (i) An unlabelled collection tube with a requisition for a V Leiden test is received in the laboratory. (ii) After PCR, the amplification control has failed to yield a product. (iii) DNA is stored overnight in a refrigerator set at 8oC but reads 14 oC. (iv) An isolated DNA sample is to be stored for at least 6 months. (v) The expiration date on a reagent has passed. (b) Explain briefly about genetic testing for new-born, including the importance of genetic testing and the disorder that genetic testing can detect.
4. Animation 12.4: This table shows results from a genetic test conducted on DNA samples from two patients. The patients are a newly married couple seeking genetic counseling about their risks of passing on a genetic disease to any children they may have in the future. The samples included the DNA region including and immediately surrounding a single gene. Restriction enzyme cleavage analyses were performed on the samples. Female Patient 1) 3400 bp fragment Male Patient 1) 1600 bp fragment 2) 1800 bp fragment 3) 3400 bp fragment DNA fragments on gel What do the genetic test results indicate about this case? O Both the woman and the man are homozygous for the mutation. O Both the woman and the man are heterozygous. O The woman is homozygous for the mutation and the man is homozygous for the normal gene. O The woman is homozygous for the mutation and the man is heterozygous.
1) You are assigned to analyze the genome of an unknown bacterium. Discuss three major steps that must be used to analyze the bacterium's genome.
Solution B that was used during the plasmid isolation contains 0.2 M NaOH (see practical manual). Which effect does NaOH have on E. coli DNA A) It denatures genomic DNA and plasmid DNA. B) It denatures genomic DNA and but not plasmid DNA. C) It denatures plasmid DNA but not genomic DNA. D) It denatures neither genomic DNA nor plasmid DNA. E) This is unpredictable.
Solution B that was used during the plasmid isolation contains 0.2 M NaOH (see practical manual). Which effect does NaOH have on E. coli DNA A) It denatures genomic DNA and plasmid DNA. B) It denatures genomic DNA and but not plasmid DNA. C) It denatures plasmid DNA but not genomic DNA. D) It denatures neither genomic DNA nor plasmid DNA. E) This is unpredictable. Which statement on the migration of DNA fragments through agarose gels is false A) Small fragments migrate faster than larger fragments because they can move faster through the agarose pores. B) Large fragments migrate faster than small fragments because they carry more negative charges. C) DNA fragments migrate towards the positive pole. D) Supercoiled DNA may migrate significantly different through the gel than linear DNA of equal size. E) The higher the agarose concentration the better the separation of smaller fragments as compared to larger fragments.
10) With the disk test, what specifically are you looking for to know if a bacteria is susceptible for an antibiotic? 11) What exactly does bacitracin do to bacteria to cause them to die or stop dividing?
Dr. Wakefield would like to isolate recombinant plasmids from her bacterial culture using the alkaline lysis method. She is planning to use the chemicals as listed below: Solution I: 50 mM glucose, 25 mM Tris-Cl (pH 8.0), 10 mM EDTA (pH 8.0) Solution II: ??? Solution III: 5 M potassium acetate, glacial acetic acid, de-ion water Ethanol 70% (v/v) Isopropanol TE-RNAase pH 8.0 (i) (ii) (iii) Based on the chemical list above, state the content(s) of Solution II. Explain the functions of Solution II described in Q3 a) (i) in plasmid isolation. What is the role of alcohol precipitation conducted after the plasmids are obtained at the end of the procedure? Discuss the roles of ethanol and salt in alcohol precipitation step.
12. When a person is determining the concentration of a sample, they will frequently repeat the samemeasurement of a sample by preparing three or more identical tubes (i.e. make replicates).a) Although you did not set up replicates today, what would be the purpose of setting upreplicates?b) If you had tested three replicates of test tube #2 in the determination of glucoseconcentration, what would you do with the data from the three replicates?
Competent E. coli cells were transformed with the pGLO plasmid. These transformed cells were then allowed to grow on two different plates: 1) a plate containing LB/AMP and 2) another plate containing LB/AMP/ARA. In which plate would you observe both phenotypic and genotypic changes? Briefly justify your answer. Edit View Insert Format Tools Table 12pt v Paragraph v BIUA e T?v 田 D2
7) Why are the following reagents used? Neutralizing solution (Plasmid isolation) Isopropanol (Plasmid isolation) RNase (isolation of genomic DNA)

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