Lecture 5 Flashcards
What is the sugar portion of RNA?
Ribose
What is the sugar portion of DNA?
Deoxyribose
What forms Nucleosides?
Purine and Pyrimidine bases linked to a five-carbon sugar
Which Nitrogen is the sugar on in Pyrimidines?
N1
Which Nitrogen is the sugar on in Purines?
N9
What are carbons in the sugar rings numbered to make them distinct from the numbering of the base?
They have a prime (‘)
What are carbons in the sugar rings numbered to make them distinct from the numbering of the base?
They have a prime (‘)
What is the difference between ribose and deoxyribose?
Ribose has a hydroxyl group at 2’ and deoxyribose doesn’t
How are the purine nucleosides named?
They gain the suffix -osine and depending on whether or not they are attached to s deoxyribose or ribose will gain the prefix deoxy-
What is the adenine nucleoside called?
- Adenosine
* Deoxyadenosine
What is the Guanine nucleoside known as?
- Guanosine
* Deoxyguanosine
How are Pyrimidine nucleosides named?
They gain the -idine suffix and depending on whether or not they are dna or rna will have a deoxy- prefix
How is the Cytosine nucleoside names?
- Cytidine
* Deoxycytidine
How is the Thymine nucleoside named?
- Deoxythymidine
* Ribothymidine
How is the Uracil nucleoside named?
•Uridine
Where does the phosphate group of a nucleotide attacher?
To the 5’ carbon
What is the difference between a nucleotide compared to a nucleoside?
Nucleotides have the phosphate group
How are nucleotides named?
nucleoside + where the phosphate group is attached ex. 5’ + number of phosphates
What are Nucleic acids?
Polymers of nucleotides linked by 3’-5’ phosphodiester bonds
What are nucleotides in Nucleic acids linked by?
3’ - 5’ Phosphodiester bonds
What color is oxygen usually?
Red
What color are nitrogen atoms?
Blue
What are Residues?
Nucleotides joined by phosphodiesters
What are ester bonds created by?
The condensation of a carboxylic acid with a hydroxyl group
