17 Questions
What is the typical unit of measurement for the length of DNA?
Number of nucleotides
How do you form a nucleoside?
By linking a nitrogenous base to the 1' carbon of the pentose sugar
What is the common name of the sugar found in DNA?
Deoxyribose
What is the result of attaching a phosphate group to a nucleoside?
A nucleotide is formed
What type of linkage connects two nucleotides in a dinucleotide?
3'-5' phosphodiester linkage
What are the two categories of nitrogenous bases found in DNA?
Purines and Pyrimidines
What is the base found in RNA but not in DNA?
Uracil
What is the consequence of the complementary nature of polynucleotide chains in DNA?
The sequence of bases in one strand determines the sequence in the other strand.
What is the polarities of the two polynucleotide chains in DNA?
One chain has 5'à3' polarity and the other has 3'à5' polarity.
How many hydrogen bonds are formed between Guanine and Cytosine?
Three
What is the approximate distance between two base pairs in the DNA helix?
0.34 nm
What is the result of the plane of one base pair stacking over the other in the double helix?
Stability of the helical structure
What is the significance of the 5' and 3' ends in a polynucleotide chain?
They are the ends of the sugar-phosphate backbone.
What is the difference between the sugar molecule in RNA and DNA?
RNA has a hydroxyl group at the 2' position.
Who is credited with the discovery of DNA as an acidic substance?
Friedrich Meischer
What was the key observation that led to the discovery of the double helix structure of DNA?
The observation of base pairing between the two strands.
What is the significance of the base pairing rules in DNA?
They stabilize the double helix structure of DNA.
Get familiar with the structure and composition of DNA, including the number of nucleotides, base pairs, and characteristics that vary among organisms. Learn about the polynucleotide chain components and their functions. Discover the fascinating world of molecular biology!
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