Download 1 - Holding-LivingEnvironment

Name: _______________________________ Period: ________ Date: ______________
DNA Homework #2
Living Environment
I. Replication
Using your 3D DNA model as a guide, in your own words describe how a DNA
molecule replicates itself. Be sure to include physical changes, chemical
changes, enzymes involved and how you get the template to form the new
strand.
Using your model as a guide, draw what occurs during replication.
II. Transcription
Using the 3D DNA molecule that you created, do the following:
 Build an mRNA molecule that is complementary to one of the DNA
strands -- the “so called” template strand. That is, show your instructor
what would happen if the DNA was being transcribed.
III. Translation
Use your mRNA as a blueprint for a polypeptide. In the space provided above,
next to the mRNA sequence, draw the amino acid sequence that would be
produced during translation.
1. How many bases make up one codon?
2. How many codons are present in the mRNA strand you made?
IV. Review:
DNA  RNA  protein
1. What process does each arrow above stand for?
2. Where in a eukaryotic cell does each process occur?
Multiple Choice
1.Which is the function of the DNA helicase enzyme in the DNA replication process?
a. Coils new DNA strands
b. Joins DNA to RNA
c. Matches nucleotide base pairs
d. Unwinds the double helix
2. Which defines a codon in DNA or mRNA?
a. Pairing of a nucleic acid and a sugar
b. Pairing of a phosphate and a sugar
c. Three-base code
d. Two-base code
3. The synthesis of RNA to DNA is called:
a. Replication
b. Translation
c. Transcription
d. Duplication
Matching
4. _____ Travels from the nucleus to a ribosome
to direct the creation of a protein
5. _____ Transport amino acids to a ribosome
6. _____ Is part of a ribosome
a. tRNA
b. mRNA
c. rRNA
Short Answer
7. State the central dogma of biology.
8. Differentiate between transcription and translation
9. Summarize the synthesis of mRNA
10. Determine the protein sequence that would be coded for by reading the following
mRNA sequence from left to right: UCUCUGGCUAUCAGC