What type of bond holds the nitrogen bases together in DNA?
hydrogen bond
Which part of DNA forms the 'rails' of the ladder?
Sugar-phosphate
Spell the organelle where DNA is mostly stored.
N–U–C–L–E–U–S
Spell the base that pairs with Cytosine.
G–U–A–N–I–N–E
Who proposed the structure of DNA in 1953?
Watson and Crick
What does the picture represent/ show?
Nucleotide
Spell the base that pairs with Guanine.
C–Y–T–O–S–I–N–E
DNA stands for…?
Deoxyribonucleic acid
In DNA, the sugar and phosphate groups join together to form a continuous chain called
sugar-phosphate backbone or DNA strand or polynucleotide chain
Nucleotide has three parts. Name them.
A phosphate group. A sugar molecule (deoxyribose). A nitrogenous base
What shape is DNA?
Double helix
Which part forms the 'rungs' of the ladder?
Nitrogen bases
TTrue or False: Without hydrogen bonds, DNA could not maintain its double helix shape.
True
Hydrogen bonds allow DNA to maintain its ___ structure while being flexible.
Helical / Double helix
If DNA is a spiral staircase, what are the steps called?
Nitrogen bases
Which base pairs with Adenine?
Thymine
If the ladder’s rails are the sugar-phosphate backbone, what keeps the steps in place?
Hydrogen bond
Spell the base that pairs with Adenine.
T–H–Y–M–I–N–E
Name the sugar in DNA.
Deoxyribose
How many strands does DNA have?
2