Nucleotides and Nucleic acids Flashcards
What three components make up a nucleotide?
A phosphate group, a pentose sugar and a base
Draw the basic nucleotide structure
…
What is the pentose sugar in DNA
Deoxyribose
Name the 4 bases in DNA and what 2 pairs they are in
Adenine and Thymine
Cytosine and Guanine
What is the change in the four bases in RNA
Thymine is replaced by Uracil
What is the basic structure of purine?
2 carbon rings
adenine and gyanine
What is the basic structure of a pyrimidine?
1 carbon ring
cytosine, thymine and uracil
What structure does ADP have?
Base adenine
Ribose sugar
Two phosphate groups
What structure does ATP have?
Base adenine
Ribose sugar
Three phosphate groups
What is it called when nucleotides join together and what bond is formed?
Polynucleotides
Phosphodiester bond
What is DNA composed of?
Two polynucleotide strands forming a double helix
How many bonds are formed between C and G?
3
How many bonds are formed between A and T
2
What is meant by antiparallel and how does this effect DNAs structure?
Strands run in opposite direction
This causes the strand to twist and form a double helix
How is DNA purified?
It can be purified by a precipitation reaction