17 Questions
What type of bond links nucleotides in a DNA strand?
Covalent bond
In the Watson-Crick double helix model, what is the diameter of the DNA helix?
20 Å
Who played a significant role in solving the X-ray diffraction pattern of DNA, leading to the Watson-Crick double helix model?
Rosalind Franklin
What is the spacing between repeating units in the DNA helix according to the Watson-Crick model?
3.4 Å
Which of the following nitrogenous bases is NOT found in DNA?
Uracil (U)
What is the significance of the Watson and Crick Double Helix Model of DNA?
It explained the antiparallel polarity of DNA strands.
Which statement best describes the DNA as per the Watson and Crick Double Helix Model?
It flows directly from its molecular structure.
What did the blender experiments of Hershey and Chase reveal about DNA's function?
It demonstrated that DNA is the genetic material.
Which component of a nucleotide is responsible for forming the backbone of the DNA double helix?
Phosphate group
In the context of DNA structure, what do X-ray diffraction patterns reveal?
The antiparallel polarity of DNA strands.
What did Avery and his colleagues demonstrate through bacterial transformation?
The genetic material was protein.
What did the Hershey-Chase Waring blender experiment aim to confirm?
Whether protein or DNA is the genetic material
In the Watson-Crick model of DNA structure, what does 'antiparallel polarity' refer to?
The directionality of the two DNA strands
What was the key result of the phages labeled with radioactive DNA or protein experiment?
Most radioactive phosphorus was in the pellet with infected bacteria cells
What are the two chemically distinct ends of a DNA polymer called?
5' end and 3' end
What do X-ray diffraction patterns help determine about DNA?
The secondary structure of DNA
Which elements are part of a nucleotide in DNA?
Phosphate, nitrogenous bases, deoxyribose sugar
Learn about a simple system to test whether protein or DNA is the genetic material using bacteriophages, viruses that infect bacteria. Explore the life cycle of bacteriophage T2, which contain very few genes but are able to replicate themselves inside a bacterial host.
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