DNA Flashcards
What does DNA stand for?
Deoxyribonucleic acid
What are the sub-units of DNA called?
Nucelotides
What is each nucleotide made up of?
A sugar called deoxyribose, a phosphate group, and a nitrogen base
What is ribose?
A sugar, like glucose, but with only five
carbon atoms in its molecule
What is deoxyribose?
Almost the same as ribose but lacks one
oxygen atom
What are the organic bases of DNA?
Adenine (A), Thymine (T), Cytosine (C), Guanine (G)
What is a molecule of DNA formed by?
Millions of nucleotides joined together in a long chain
DNA usually consists of a _______ strand of nucleotides?
Double
The strands are held together between the bases by what kind of bond?
Chemical
What are the pairs of bases?
- Adenine and thymine
- Cytosine and guanine
The paired strands are coiled into a spiral called?
Double helix
The helix makes one complete twist every ____ nucleotides?
10
What is the length of a complete twist?
3.4 nanometers
Who discovered the chemical structure of DNA?
Watson and Crick
True or false, replication can occur at different sites within one DNA molecule at the same time?
True