Homework Answers
1. Conservative
2. Dispersive
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After Watson and Crick proposed the double helix model of DNA, three models for DNA replication...
Watson and Crick A. Determined the mode of DNA replication Rosalind Franklin B. Discovered the four...
Watson and Crick A. Determined the mode of DNA replication Rosalind Franklin B. Discovered the four DNA nucleotides: A, T, C, G Meselson and Stahl C. Determined the ratios of nucleotides in DNA Edwin Chargaff D.Used X-ray crystallography to determine the 3- Dimensional structure of DNA E. Proposed a double helix model of DNA F. Proposed a triple helical model of DNA
Draw the DNA double helix as proposed by Watson and Crick in their famous 1953 paper....
Draw the DNA double helix as proposed by Watson and Crick in their famous 1953 paper. On this drawing, indicate the locations of the following: the ribose-phosphodiester backbone the base pairs the 5' and 3' ends of the two strands the number of base pairs in one complete turn of the helix the length of 1 complete turn of the double helix (in Angstroms or nanometers)
*BIOCHEMISTRY QUESTION ABOUT MESELSON AND STAHL* There were 3 possible models for DNA replication prior to...
*BIOCHEMISTRY QUESTION ABOUT MESELSON AND STAHL* There were 3 possible models for DNA replication prior to the Meselson and Stahl experiment, one of which was dispersive replication. a) Assuming that this is relatively uniform (each of the new chromosomes gets roughly equal amounts of the old ones) draw the peak traces for 0, 1, 2, 5 and 10 generations. b) If dispersive replication was not relatively uniform how would your answer change?
If DNA was replicated via a conservative mechanism and you repeated the Meselson and Stahl experiment,...
If DNA was replicated via a conservative mechanism and you repeated the Meselson and Stahl experiment, what would you expect to see when the bacteria was allowed to replicate 3 times (60 min) in the N14 medium and DNA was extracted and centrifuged? Select one: a. several bands (uncountable) forming a smear across the tube b. Two bands one formed using only N14 and one formed by N15 c. it is impossible to determine given the information provided d. Two...
QUESTION 27 The Meselson and Stahl experiment was used to compare the conservative, semiconservative and dispersive...
QUESTION 27 The Meselson and Stahl experiment was used to compare the conservative, semiconservative and dispersive models of DNA replication. They cultured E. coli cells for several generations in a medium containing heavy nitrogen, 15 N. They then transferred the bacteria to a medium containing a lighter nitrogen isotope, 14 N. Samples were taken after the first round of DNA replication; another sample was taken after the second round of replication. They extracted DNA and centrifuged each sample. Explain (in...
BIOCHEMISTRY 2points each 1. Describe the DNA helix proposed by Watson and Crisk A) The Watson...
BIOCHEMISTRY
2points each 1. Describe the DNA helix proposed by Watson and Crisk A) The Watson and Crick DNA model contains two DNA polymer strands coiled around a B) The strands are oriented in opposite directions, from S to 3 (antiparallel), and the two C) The sugar-phosphate backbone is located on the outside. The base pairs are stacked in the common axis. strands are twisted in a right-handed coil. center of the helix and are stabilized by specific hydrogen bonds...
In a famous experiment, Matthew Meselson and Franklin Stahl grew E.coli cells in a medium containing...
In a famous experiment, Matthew Meselson and Franklin Stahl grew E.coli cells in a medium containing only the "her isotope of nitrogen, SN. These cells were then transferred to a medium with the "light" isotope of nitrogen, "N. The results of the experiment supported the hypothesis of semiconservative replication, which was proposed by Watson and Crick. Heavy DNA ('N DNA), hybrid DNA, and light DNA (N DNA) can be separated by centrifugation. If cells containing 1SN DNA are transferred to...
Exercise 2: Heredity and DNA replication 1. In Mendel’s experiments with pea plants, name and describe...
Exercise 2: Heredity and DNA replication 1. In Mendel’s experiments with pea plants, name and describe the experiment which demonstrated that emasculation was not the reason why the wrinkled seed shape disappeared in the F1 generation. (4 marks) 2. In Mendel’s experiments with pea plants, test crosses used a plant which was homozygous recessive to determine the genotype of the F2 plant. Why did the test crosses not use plants which was homozygous for the dominant allele? (2 marks) 3....
Please need help answering question A the pages of background information are posted thanks Read page...
Please need help answering question A the pages of background
information are posted thanks
Read page 196-197 and figure 6.20. regarding Meselson and
Stahl’s experiment regarding DNA replication. And Answer the
following question
If you are using this radioactive technique in mouse cells,
what would happen in each phase of G1, S, G2, mitosis and meiosis
assuming that you are grown cells in 15N medium for many
generations and cells in G1are then switched to 14N medium?
G1
S
G2...
mays is a diploid species with 10 pairs of chromosomes in each somatic cell. How many...
mays is a diploid species with 10 pairs of chromosomes in each somatic cell. How many chromosomes will be found per cell in each of the following chromosome mutants? Questions 64 to 67 are connected 64) Trisomy? E) 21 D) 30 A) 19 B) 22 65) Monosomy E) 21 A) 19 B) 22 C) 60 66) triploid E) 21 B) 22 67) Tetrasomy D) 30 E) 21 A) 19 B) 22 68) Species I has 2n -12 chromosomes and species...
Watson and Crick A. Determined the mode of DNA replication Rosalind Franklin B. Discovered the four DNA nucleotides: A, T, C, G Meselson and Stahl C. Determined the ratios of nucleotides in DNA Edwin Chargaff D.Used X-ray crystallography to determine the 3- Dimensional structure of DNA E. Proposed a double helix model of DNA F. Proposed a triple helical model of DNA
If DNA was replicated via a conservative mechanism and you repeated the Meselson and Stahl experiment, what would you expect to see when the bacteria was allowed to replicate 3 times (60 min) in the N14 medium and DNA was extracted and centrifuged? Select one: a. several bands (uncountable) forming a smear across the tube b. Two bands one formed using only N14 and one formed by N15 c. it is impossible to determine given the information provided d. Two...
QUESTION 27 The Meselson and Stahl experiment was used to compare the conservative, semiconservative and dispersive models of DNA replication. They cultured E. coli cells for several generations in a medium containing heavy nitrogen, 15 N. They then transferred the bacteria to a medium containing a lighter nitrogen isotope, 14 N. Samples were taken after the first round of DNA replication; another sample was taken after the second round of replication. They extracted DNA and centrifuged each sample. Explain (in...
BIOCHEMISTRY
2points each 1. Describe the DNA helix proposed by Watson and Crisk A) The Watson and Crick DNA model contains two DNA polymer strands coiled around a B) The strands are oriented in opposite directions, from S to 3 (antiparallel), and the two C) The sugar-phosphate backbone is located on the outside. The base pairs are stacked in the common axis. strands are twisted in a right-handed coil. center of the helix and are stabilized by specific hydrogen bonds...
In a famous experiment, Matthew Meselson and Franklin Stahl grew E.coli cells in a medium containing only the "her isotope of nitrogen, SN. These cells were then transferred to a medium with the "light" isotope of nitrogen, "N. The results of the experiment supported the hypothesis of semiconservative replication, which was proposed by Watson and Crick. Heavy DNA ('N DNA), hybrid DNA, and light DNA (N DNA) can be separated by centrifugation. If cells containing 1SN DNA are transferred to...
Please need help answering question A the pages of background
information are posted thanks
Read page 196-197 and figure 6.20. regarding Meselson and
Stahl’s experiment regarding DNA replication. And Answer the
following question
If you are using this radioactive technique in mouse cells,
what would happen in each phase of G1, S, G2, mitosis and meiosis
assuming that you are grown cells in 15N medium for many
generations and cells in G1are then switched to 14N medium?
G1
S
G2...
mays is a diploid species with 10 pairs of chromosomes in each somatic cell. How many chromosomes will be found per cell in each of the following chromosome mutants? Questions 64 to 67 are connected 64) Trisomy? E) 21 D) 30 A) 19 B) 22 65) Monosomy E) 21 A) 19 B) 22 C) 60 66) triploid E) 21 B) 22 67) Tetrasomy D) 30 E) 21 A) 19 B) 22 68) Species I has 2n -12 chromosomes and species...
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