Name: ______________________________________________ Date: _______________ Period: ______
Biology: DNA and RNA Review
DNA Basic Information
1. How many nucleotides are shown in the DNA segment pictured to
the right?
P
S
Six
S
2. Name the three parts of a DNA nucleotide.
P
a. Sugar
P
b. Phosphate
S
c. Nitrogen base
S
3. Circle one complete nucleotide on the DNA segment to the right.
P
P
4. Use the letters P (phosphate) and S (sugar) to label the sugar and
phosphate of the DNA molecule to the right.
S
S
5. Which part does the phosphate molecule connect with?
P
Sugar
DNA Replication: Use your understanding of DNA replication to solve the questions below.
6. The diagram below shows DNA replication.
a. In area A, fill in the missing DNA bases
from the given nucleotides.
b. Name the enzyme that will separate the
DNA strands in area A.
DNA Helicase
c. In area B, perform DNA replication and fill
in the two new strand of DNA.
d. Name the enzyme that will reconnect the
DNA bases in area B.
DNA Polymerase
e. After filling in the correct DNA bases in
area B, are the two strand of DNA identical?
YES
NO
T
G
G
T
A
A
C
G
C
G
T
G
G
T
A
A
C
G
C
G
A
C
C
A
T
T
G
C
G
C
Transcription: Use your understanding of transcription to answer the questions below.
7. Define TRANSCRIPTION:
Process of making RNA from DNA
8. Name the four RNA bases.
a. Adenine
b. Cytosine
c. Guanine
d. Uracil
9. Pretend RNA Polymerase has already separated the DNA strand below. Perform transcription
and fill in the mRNA bases from the given DNA bases. Remember that DNA has different bases
than RNA.
U U A G G C G A U C
10. Following the rules of transcription, predict which DNA bases would have created the given
mRNA bases. Remember that DNA has different bases than RNA.
A G C A T G G T A A
11. Following the rules of transcription, fill in the missing bases from the strands of DNA and RNA.
C A
U A
A
G C
T A
A
12. Examine #11. Is the top strand a piece of DNA or RNA? Explain your answer.
The top strand is DNA letters. I know this because the letter T was present in the top. The bottom
strand has the letter U, so that must be RNA.