biology worksheet
Name
13.2 The Structure of DNA
The Components of DNA
For Questions 1-5, complete each statement by writing in the correct word or words.
3. DNA contains four kinds of nitrogenous bases:
and
1. The building blocks of DNA are
2. Nucleotides in DNA are made of three basic components: a sugar called
and a nitrogenous_
4. In DNA,
5. The nucleotides in DNA are joined by
Scientist
Erwin Chargaff
Rosalind Franklin
James Watson and Francis
Crick
can be joined in any order.
Solving the Structure of DNA
6. Complete the table to describe each scientist’s contribution to solving the structure of
DNA.
DNA sample
1
2
3
Percent of
adenine
31.5
Class
Contribution
7. Complete the table by estimating the percentages of each based on Chargaff’s rules.
Percent of
thymine
30
Date
bonds.
Percent of
guanine
20
‚a
Percent of
cytosine
17
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