DNA Flashcards
1
Q
what did Friedrich Miescher discover when looking at WBC extractions
A
acidic substance from cell nucleus (nucleic acid)
2
Q
what element does DNA contain
A
nitrogen
3
Q
4 dna bases
A
adenine, thymine, cytosine, guanine
4
Q
which bases are connected and equal
A
A and T
G and C
5
Q
what did x ray diffraction show about dna
A
its a helix
6
Q
what’s dna’s backbone made of
A
ribose sugar and phosphate
7
Q
what did dna’s width suggest
A
that its made up of 2 strands, forming double helix
8
Q
what’s dna made up of
so what is it
A
nucleotides
polymer
9
Q
how many base pairs of dna
A
3.2 billion
10
Q
why is dna so small in thickness but 2 m long (2nm thick)
A
as has to fit in cell nucleus
11
Q
how can dna be shortened
A
if knots are made in it wrapped around histones
