Structure and Replication of DNA Flashcards
State the name for a DNA subunit
DNA nucleotide
Name the basic components of a
DNA nucleotide
Deoxyribose sugar, phosphate and
a base
Which bases are found in a
molecule of DNA?
ATGC
How are nucleotides in a DNA
strand held together?
By hydrogen bonds between
complementary bases
Describe complimentary base pairing
in DNA
Adenine pairs with Thymine
Cytosine pairs with Guanine
Describe how the two DNA strands
are held together
By hydrogen bonds between
complementary bases
How can the two strands in DNA be
described in terms of their structure?
Antiparallel structures twist to
form a double helix
Name the nucleotide structure found
at the 3’ end of a DNA strand
Deoxyribose sugar
Name the nucleotide structure
found at the 5’ end of a DNA strand
Phosphate
Prior to cell division, what
happens?
DNA is replicated
What must be done to a molecule of
DNA to allow DNA replication to
begin?
DNA is unwound and hydrogen
bonds break to form two template
strands
Name the enzyme involved in
adding nucleotides to the new DNA
strand during replication
DNA polymerase
How does DNA polymerase add
nucleotides to a new DNA strand
forming?
To the 3’ (deoxyribose) end of
the new strand forming
Which additional structures are
required for DNA polymerase to
begin DNA replication?
Primers
Describe how the leading DNA strand
is replicated
continuously