Biology (Dna) Worksheet - Answer Key
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4Name_________________________________________________________Date_____________________Period_________
Biology: DNA (Ch.8) Review
DNA Basic Information
1. How many nucleotides are shown in the DNA segment pictured?
6
2. Circle an entire nucleotide on the DNA segment.
3. Name the three parts of a DNA nucleotide.
a. Phosphate group
b. sugar
c. Nitrogen base
4. Use the letters P (phosphate) and S (sugar) to label the sugar
and phosphate of the DNA molecule to the right.
5. Which part does the phosphate molecule connect with?
sugar
6. What is the special shape of DNA called?
Double Helix
7. a)Which type of chemical bond joins the DNA nitrogen bases? b)Which type of chemical bond joins the
backbone of the DNA molecule?
a._hydrogen___
b.___covalent____
DNA Replication
T
T
A
8. The diagram below shows DNA replication.
a. In area A, fill in the missing DNA bases from
G
G
C
the given nucleotides.
G
G
C
b. Name the enzyme that will separate the DNA
T
T
A
strands in area A.
DNA helicase
A
A
T
A
A
T
c. In area B, perform DNA replication and fill in
the two new strands of DNA.
C
C
G
G
G
C
d. Name the enzyme that will reconnect the DNA
bases in area B.
C
C
G
DNA polymerase
e. After filling in the correct DNA bases in area B,
G
G
C
are the two strands of DNA identical?
YES
NO
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