Discovering the Structure of DNA quiz #5 Flashcards
Discovering the Structure of DNA quiz #5
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What crucial structural feature of DNA did Photo 51 provide evidence for?
Photo 51 provided evidence for the double helix structure of DNA. What is meant by the term 'antiparallel' in the context of DNA structure?
Antiparallel means that the two DNA strands run in opposite directions, with one strand going from 5' to 3' and the other from 3' to 5'. Which nitrogenous bases pair together in DNA, and what type of bond holds them together?
Adenine pairs with thymine, and cytosine pairs with guanine; these pairs are held together by hydrogen bonds. How are the 5' and 3' ends of a DNA strand chemically different?
The 5' end has a free phosphate group, while the 3' end has a free hydroxyl group. Why is understanding the structure of DNA important for studying DNA replication?
Understanding DNA structure is essential because the antiparallel strands and base pairing rules are critical for accurate DNA replication. Describe the overall shape of the DNA molecule as discovered by Watson and Crick.
The DNA molecule has a double helix shape, resembling a twisted ladder. How did Watson and Crick's model explain the specificity of base pairing in DNA?
Their model showed that adenine pairs specifically with thymine and cytosine with guanine, ensuring accurate genetic information transfer. What evidence did x-ray diffraction provide about the structure of DNA?
X-ray diffraction revealed the helical, repeating structure of DNA, supporting the double helix model. How are nucleotides linked together within a single DNA strand?
Nucleotides are linked together by covalent bonds between the phosphate group of one nucleotide and the sugar of the next, forming the sugar-phosphate backbone. What crucial structural feature of DNA did Photo 51 provide evidence for?
Photo 51 provided evidence for the double helix structure of DNA.
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