Biology, 26.11.2019 23:31 jayp02

How did watson and crick determine base pairing?
a. they analyzed the work of phoebus levene.
b. they used chargaff's rule to fit the bases together.
c. they broke the hydrogen bond.
d. they observed the pairing under a microscope.

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Answer from: 0465834wu1

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

Further Explanation Watson 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; link Watson and crick model; link

Level; High school

Subject; Biology

Topic; Nucleic acids

Sub-topic: DNA structure and base pairing.

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the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.

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How did watson and crick determine base pairing?
a. they analyzed the work of phoebus levene....

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