Biology (Dna) Worksheet - Answer Key Page 2
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49. Put the pictures of DNA replication in order by placing a 1, 2, or 3 on the line above the picture.
10. Describe what is happening on the lines below the picture.
____3____
______1_______
______2______
DNA polymerase
DNA Helicase splits
Free floating DNA
reconnects 2 DNA
the DNA molecule
nucleotides match to the
strands
open DNA chain
DNA and RNA Comparison
11. Complete the following chart by comparing DNA, mRNA, and tRNA. Sample answers have been provided.
DNA
mRNA
tRNA
Molecule full name
Messenger ribonucleic
Transfer ribonucleic
Deoxyribonucleic acid
acid
acid
Name of Sugar
deoxyribose
Ribose
ribose
Nitrogen bases present
Adenine, thymine,
Adenine, Uracil,
Adenine, Uracil,
cytosine, guanine
Guanine, Cytosine
Guanine, Cytosine
Function
Copies the DNA and
Stores genetic
Transfers an amino
carries the code to a
information.
acid to a ribosome
ribosome
12. For each statement write DNA, mRNA, or tRNA
DNA Holds the original coded
DNA Found in the nucleus only
information for making proteins
DNA Can replicate itself (with the help of
tRNA Found mostly in the cytoplasm
enzymes)
mRNA Copies DNA’s coded message
mRNA Found equally in both the cytoplasm
and nucleus
tRNA Carries amino acids to the ribosome for
mRNA Carries coded message to the ribosome
assembly
Transcription
13. Pretend RNA polymerase has already separated the DNA strand below. Perform transcription and fill in
the mRNA bases from the given DNA bases. Remember to replace T with U for RNA.
U U A G G C G A U C
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