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Unit 1 Key Area 2 Word Bank
Structure and Replication of DNA
19
Anatomy
Intermediate
05/25/2017

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Cards

Term
DNA consists of
Definition
2 strands of nucleotides twisted into a double helix
Term
DNA nucleotides contain
Definition
deoxyribose sugar, phosphate and a base (A,T,C or G)
Term
Deoxyribose has a base attached to
Definition
its carbon 1, and a phosphate attached to its carbon 5
Term
The DNA sugar-phosphate backbone is held together by
Definition
strong chemical bonds
Term
The 2 DNA strands are antiparallel
Definition
with deoxyribose sugar and phosphate at 3’ and 5’ ends of each strand
Term
Adenine pairs with
Definition
Thymine
Term
Cytosine pairs with
Definition
Guanine
Term
Chromosomes consist of
Definition
tightly coiled DNA packaged around bundles of protein (Histones)
Term
Replication of the DNA template strand
Definition
with the 3’ end is continuous and forms the “leading strand”
Term
DNA chain of nucleotides
Definition
can only grow by adding nucleotides to its 3’ end
Term
DNA polymerase brings about
Definition
the formation of the sugar-phosphate bonds
Term
The enzyme ligase joins
Definition
fragments of DNA together to form the lagging strand
Term
Requirements for DNA Replication are:
Definition
DNA, Primers,Enzymes, DNA nucleotides and ATP
Term
A DNA strand has
Definition
Deoxyribose at the 3’ end and phosphate at the 5’ end of each strand
Term
A DNA primer is made of
Definition
a short sequence of nucleotides
Term
Replication of the lagging strand
Definition
is discontinuous as this strand starts with the 5’ end
Term
In the first stages of DNA replication
Definition
the DNA double helix unwinds and the weak hydrogen bonds between bases break
Term
Primers are required to create
Definition
an existing chain for DNA polymerase to work on
Term
Before a cell divides
Definition
the DNA must be replicated
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