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GIZMO Building DNA | Building DNA Student Exploration - ALL ANSWERS CORRECT
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GIZMO Building DNA | Building DNA Student Exploration - ALL ANSWERS CORRECT
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Building DNA Answer KeyVocabulary: double helix, DNA, enzyme, mutation, nitrogenous base, nucleoside, nucleotide,
replication
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
[Note: The purpose of these questions is to activate prior knowledge and get students thinking.
Students are not expected to know the answers to the Prior Knowledge Questions.]
DNA is an incredible molecule that forms the basis of life on Earth. DNA molecules contain
instructions for building every living organism on Earth, from the tiniest bacterium to a massive
blue whale. DNA also has the ability to replicate, or make copies of itself. This allows living
things to grow and reproduce.
1. Look at the DNA molecule shown at right. What does it look like?
Answers will vary, but may include a twisted ladder or a double spiral.
This shape is called a double helix.
2. Based on this picture, how do you think a DNA molecule makes a
copy of itself? (Hint: Look at the bottom two “rungs” of the ladder.)
Answers will vary. [The hint refers the fact that the nitrogenous bases
at the bottom of the molecule are splitting apart, which will eventually
divide the molecule into two strands. Each strand will be used as a
template for the formation of a new strand.]
Gizmo Warm-up
The Building DNA Gizmo™ allows you to construct a DNA
molecule and go through the process of DNA replication.
Examine the components that make up a DNA molecule.
1. What are the two DNA components shown in the Gizmo?
Nucleosides and phosphates are shown.
2. A nucleoside has two parts: a pentagonal sugar
(deoxyribose) and a nitrogenous base (in color). When a
nucleoside is joined to a phosphate, it is called a nucleotide.
How many different nitrogenous bases do you see? Four (A, C, G, and T)
Note: The names of these nitrogenous bases are adenine (red), cytosine (yellow), guanine
(blue), and thymine (green).
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