Homework Answers
A-Meselson and Stahl
- He proposed that DNA replication is of semi conservative type.
B-Friedrich Meischer
- The four nucleotides are adenine, thymine, guanine and cytosine.
C-Edwin chargaff
- Adenine binds with thymine and guanine binds with cytosine.
D-Rosalind Franklin
- 3D structure of DNA is in the shape of a twisted ladder.
E-Watson and Crick
- Double helical model of DNA explains that DNA is a double stranded structure which is in the shape of a twisted ladder.
F-Linus Pauling
- In a triple helical model of DNA three strands of nucleotides wind around each other.
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Watson and Crick A. Determined the mode of DNA replication Rosalind Franklin B. Discovered the four...
After Watson and Crick proposed the double helix model of DNA, three models for DNA replication...
After Watson and Crick proposed the double helix model of DNA, three models for DNA replication were proposed: conservative, semiconservative and dispersive. The following figures illustrate the Meselson and Stahl experiment, which demonstrated the correctness of the semiconservative model of DNA replication N15 N14 How would the results be if the correct model was the conservative or dispersive: 1. Conservative: 20 40 60 80 Time (min.) 2. Dispersive 20 40 60 80 Time (min.)
It was Rosalind Franklin that helped Watson and Crick realize that the sugar-phosphate backbone of DNA...
It was Rosalind Franklin that helped Watson and Crick realize that the sugar-phosphate backbone of DNA would be facing outwardly and the nitrogen bases would be facing inwardly in the double helix. What properties of these molecules made her so sure of that?
Chargaff discovered that the A-T bond has the same width as the G-C bond. What implication...
Chargaff discovered that the A-T bond has the same width as the G-C bond. What implication does this have for the structure of the DNA molecule? It means that the molecule will vary in width as you move down its length, depending on the number of A-T and G-C nucleotides. It means that the molecule will be very hydrophilic, because nucleotides are hydrophilic. It means that DNA was the first life form on Earth. It means that the molecule will...
Which of the following statements is true regarding the discovery of the double helix? Choose 1...
Which of the following statements is true regarding the discovery of the double helix? Choose 1 answer: (A) It was discovered that double-stranded DNA is a parallel molecule. Rosalind Franklin's x-ray crystallography provided Watson and Crick with important data that helped determine the structure of DNA. The experiments that led to the discovery of the double helix ultimately disproved Chargaff's rules regarding nitrogenous bases. James Watson, Francis Crick, Maurice Wilkins, and Rosalind Franklin were awarded the Nobel Prize in Medicine...
3.) It was Rosalind Franklin that helped Watson and Crick realize that the sugar-phosphate backbone of...
3.) It was Rosalind Franklin that helped Watson and Crick realize that the sugar-phosphate backbone of DNA would be facing outwardly and the nitrogen bases would be facing inwardly in the double helix. What properties of these molecules made her so sure of that? 4.) Enzymes are often named for what they do, that is, the reaction that they catalyze. Give three examples of enzymes like that from this chapter, giving the enzyme and its function. 5.) During DNA replication,...
What kind of data on DNA structure was gathered by Rosalind Franklin and Maurice Wilkins? a....
What kind of data on DNA structure was gathered by Rosalind Franklin and Maurice Wilkins? a. 3D model b. X-ray diffraction pattern data Oc Relative ratios of nucleotides across species d. Poly.A tail composition
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...
1. Read through the introduction. Answer the questions in between each historical section. 1. 2. 3....
1. Read through the introduction. Answer the questions in
between each historical section.
1.
2.
3.
-----------------
1.
2.
genetic molecule? The Evidence: 1949-1952 1949: Erwin Chargaff, a biochemist, reports that DNA composition is species-specific, that is, the amount of DNA and its nitrogenous bases varies from one species to another. In addition, Chargaff finds that the amount of adenine equals the amount of thymine, and the amount of quanine equals the amount of cytosine in DNA from every species....
las n o relationship with the tertiary structure. nuclease proves that the primary structure of a...
las n o relationship with the tertiary structure. nuclease proves that the primary structure of a globular the he d) The planes of base pairs using ribo e) Th rs are parallel to the helix axis in the Watson-Crick DNA double helix. e sequence on one strand of n Crick DNA doubld e the helix varies independenty of that in the other strand in the varies in 10. The person n that discovered that A:T and G:C ratios in DNA...
13. What are TWO of the insights Watson and Crick had with respect to the structure...
13. What are TWO of the insights Watson and Crick had with respect to the structure of DNA? a. DNA is a double-stranded helix held together by A:T or C:G base pairs b. DNA is a helix and has A:T or C:G base pairs c. DNA is a double-stranded helix and the amount of A=T and of G=C d. DNA has two strands in opposite orientation and the amount of A=T and of G=C 14. Griffith's experiment injecting a mixture...
After Watson and Crick proposed the double helix model of DNA, three models for DNA replication were proposed: conservative, semiconservative and dispersive. The following figures illustrate the Meselson and Stahl experiment, which demonstrated the correctness of the semiconservative model of DNA replication N15 N14 How would the results be if the correct model was the conservative or dispersive: 1. Conservative: 20 40 60 80 Time (min.) 2. Dispersive 20 40 60 80 Time (min.)
Which of the following statements is true regarding the discovery of the double helix? Choose 1 answer: (A) It was discovered that double-stranded DNA is a parallel molecule. Rosalind Franklin's x-ray crystallography provided Watson and Crick with important data that helped determine the structure of DNA. The experiments that led to the discovery of the double helix ultimately disproved Chargaff's rules regarding nitrogenous bases. James Watson, Francis Crick, Maurice Wilkins, and Rosalind Franklin were awarded the Nobel Prize in Medicine...
3.) It was Rosalind Franklin that helped Watson and Crick realize that the sugar-phosphate backbone of DNA would be facing outwardly and the nitrogen bases would be facing inwardly in the double helix. What properties of these molecules made her so sure of that? 4.) Enzymes are often named for what they do, that is, the reaction that they catalyze. Give three examples of enzymes like that from this chapter, giving the enzyme and its function. 5.) During DNA replication,...
What kind of data on DNA structure was gathered by Rosalind Franklin and Maurice Wilkins? a. 3D model b. X-ray diffraction pattern data Oc Relative ratios of nucleotides across species d. Poly.A tail composition
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...
1. Read through the introduction. Answer the questions in
between each historical section.
1.
2.
3.
-----------------
1.
2.
genetic molecule? The Evidence: 1949-1952 1949: Erwin Chargaff, a biochemist, reports that DNA composition is species-specific, that is, the amount of DNA and its nitrogenous bases varies from one species to another. In addition, Chargaff finds that the amount of adenine equals the amount of thymine, and the amount of quanine equals the amount of cytosine in DNA from every species....
las n o relationship with the tertiary structure. nuclease proves that the primary structure of a globular the he d) The planes of base pairs using ribo e) Th rs are parallel to the helix axis in the Watson-Crick DNA double helix. e sequence on one strand of n Crick DNA doubld e the helix varies independenty of that in the other strand in the varies in 10. The person n that discovered that A:T and G:C ratios in DNA...
13. What are TWO of the insights Watson and Crick had with respect to the structure of DNA? a. DNA is a double-stranded helix held together by A:T or C:G base pairs b. DNA is a helix and has A:T or C:G base pairs c. DNA is a double-stranded helix and the amount of A=T and of G=C d. DNA has two strands in opposite orientation and the amount of A=T and of G=C 14. Griffith's experiment injecting a mixture...
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