Explain how chargaff s rule watson and crick model dna (2023)

They concluded that the genetic material of the bacteriophage wasDNA, not a protein. ...Explain how Chargaff's ruleof base pairinghelped Watson and Crick model DNA. It was identified during the double helix. Adenine was exactly for thymine and guanine was fit for cytosine

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Biology

1. adenine

2. phosphates

3. antiparallel

4. X-ray crystallography is a technique used to learn more about the three-dimensional structure of biological molecules. In x-ray crystallography, a molecule (for example, DNA) is crystallized. Then, x-ray beams are directed onto the molecular crystal. The pattern of diffraction, or bending, of the x-rays provides information about the physical properties of the molecule. Rosalind Franklin used x-ray crystallography to investigate the three-dimensional structure of DNA.

5. Watson and Crick were interested in learning more about the physical structure of DNA. They had come up with several hypotheses about how DNA could be structured, but they needed more concrete evidence of the molecule's structure. Rosalind Franklin's Photo 51 provided important information to Watson and Crick as they worked on a model of the three-dimensional structure of DNA.

6. Photo 51 confirmed that DNA is a double helix. Watson and Crick's model of DNA included that it is antiparallel, and that each base pair is held together by hydrogen bonds. The DNA chain is comprised of an outer backbone alternating between the sugar deoxyribose and phosphate groups. The base pairs, which are held together by hydrogen bonds, are located on the inner portion of the double helix.

7. Chargaff found that the number of adenine nucleotides was always roughly the same as the number of thymines, and the number of cytosines was about the same as the number of guanines. This provided the insight that in the DNA double helix, A selectively bonds with T, while G bonds with C. This explains why Chargaff consistently found that the number of As and Ts, and the number of Cs and Gs, were the same in his studies.

Biology

1) nitrogen bases

2) the 1950’s; microscope

3) DNA and protein

4) nucleotides

5) X-ray diffraction

6) ball-and-stick model-building

7) 25 April 1953

8) was critical to Watson and Crick

9) adenine-timine; guanine-citosine

10) double helix

11) base pairs

12) G with C and A with T

13) 1953

14) died

15) unwound

16) synthesized; a new molecule

Explanation:

Nitrogenous bases are used to construct nucleotides. Until the discovery of the helical shape of the DNA molecule, were only possible to identify the genetic material (chromosomes) by the microscope. Chromosomes are composed of DNA and proteins (histones). Nucleotides are the building blocks of the DNA molecule. The X-ray diffraction data obtained by Rosalind Franklin were used to decipher the DNA structure. The ball-and-stick is a molecular model where atoms are represented by spheres and bonds are represented by rods. Chargaff's rules indicate that the content of cytosine is equal to guanine and adenine is equal to thymine. Rosalind Franklin died of ovarian cancer in 1958. The double-stranded DNA molecule must be unwound and then the DNA strands serve as templates to synthesize identical DNA molecules.

Biology

Social Studies

Biology

The correct statement is-

They used Chargaff's rule to determine that it contains ribose sugar.

They used Franklin's photo to determine that DNA was a double helix.

Explanation:

Watson and Crick used pieces of information available from different researchers such as Chargaff's rules and Franklin.

Chargaff had explained that of the four kinds of nucleotides are present in a DNA molecule in such a manner that 2 types of nucleotides were always present in the same amounts and the other 2 types of nucleotides were also always present in same amounts.

The first X-ray picture of DNA, created by Rosalind Franklin using a technique known as X-ray crystallography, which led to Watson and Crick's model of DNA. It explained the helical shape of the DNA molecule.

The correct statement is-

They used Chargaff's rule to determine that it contains ribose sugar.

They used Franklin's photo to determine that DNA was a double helix.

Biology

b.

Explanation:

They used Franklin's photo to determine that DNA was a double helix.

Biology

Watson and Crick determined base pairing by using Chargaff's rule to fit the bases together.

Further ExplanationWatson and Crick discovered that the DNA strands exists as a double helix, which appears like a twisted ladder. In doing so, Watson and Crick used the Chargaff’s rule to confirm the base pairing in the double stranded DNA, so as to fit the complementary bases together.Structure of DNADNA is a nucleic acid that carries genetic material in all living organisms. DNA is a double stranded nucleic acid whose building blocks are known as nucleotides. Each nucleotide contains a sugar, a phosphate group and a nitrogenous base. The four nucleotide bases found in the DNA are Adenine, Cytosine, Thymine and Guanine. The strands of DNA are attached to each other as a result of base pairing that occurs through hydrogen bonding as explained by Chargaff’s rule.Chargaff’s rule.Chargaff’s rule describes the base pairing in a DNA molecule, such that the base Guanine pairs with the base Cytosine in the complementary strand, while the base Adenine pairs with Thymine. This means the number of thymine bases in a DNA molecule will be equal to the number of Adenine bases, while Guanine bases will be equal to Cytosine bases. The result is a ratio of 1:1 between pyrimidines and purines in a molecule of DNA.Chargaff's rule of base pairing provided Watson and Crick with a prove that their model was correct, since it agreed with Chargaff's as far as the percentages of A,T,G, and C in DNA are concerned. According to Watson and Crick model, the hydrogen bonds could only form between adenine and thymine, and between cytosine and guanine to create an almost perfect fit.

Keywords; Watson and crick model, Chargaff’s rule, DNA, and base pairing.

Learn more about;DNA and its structure; linkWatson and crick model; link

Level; High school

Subject; Biology

Topic; Nucleic acids

Sub-topic: DNA structure and base pairing.

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C.

Explanation:

Darwin's theory of evolution and Mendel's ideas of heritability were merged into the modern synthesis.

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