DNA Flashcards
(27 cards)
Watson and Crick
Discovered the structure of DNA
What kind of stucture does DNA have?
double helix
What holds two strands of DNA together?
weak hydrogen bonds
Which bases always pair up?
adenine and thymine
guanine and cytosine
nucleotide
made up of a sugar, a phosphate group, and a nitrogen base
DNA
directs all the activities of the cell (how to make proteins)
genetics
the study of heredity
What part(s) help identify types of nucleotides?
nitrogen base
There are always ___ of adenine and thymine and guanine and cytosine.
equal
DNA can be seen as a ladder. What are the sides of the ladder made of?
alternating sugars and phosphates
DNA stands for…
Dioxyribonucleic acid
purine
adenine and guanine
pyrimidine
cytosine and thymine
purines are made of ___ rings.
two
pyrimidines are made of ___ rings.
one
Erwin Chargaff
determined there are equal amounts of adenine and thymine in DNA.
List from large to small:
chromosome, DNA strand, cell, nucleus
cell, nucleus, chromosome, DNA strand
gel electrophoresis
a way to sort and measure the length of DNA
What makes the DNA move through the filter?
electric current
What lengthed DNA strand move through the gel fastest?
short
What charge does DNA have?
a negative charge
How is DNA made visible so that it could be examined?
it is stained
After stainning, what does large groups of DNA strands show up as?
bands
1
phosphate group
