Nucleic acids Flashcards
What do nucleic acids consist of?
A nitrogenous base, a phosphate and a sugar
How is the phosphate attached to the sugar?
A phosphoester bond
What is the difference between ribose and deoxyribose?
Ribose = OH on Carbon 2 Deoxyribose= H on Carbon 2
What is the structure of a purine?
Double ring
Which of the bases are purine?
Adenine and Guanine (pure agony)
What is the structure of pyrimidines?
Single ring structure
Which of the bases are pyrimidine?
Cytosine thymine and uracil
What are phosphates linked to deoxyribose sugars by?
Phosphodiester bonds
Which carbons does the phosphodiester bond form between?
3’-5’
What are the bases in each pair linked by?
Hydrogen bonds
What is the name given to describe the two chains which run in opposite directions?
Antiparallel
How many hydrogen bonds exist between Guanine and cytosine?
3
How many hydrogen bonds exist between adenine and thymine?
2
How can mRNA form base pairs
By looping back on itself
How many regions does tRNA have where base pairing is possible?
5