Question

biology i: unit 2 (a dna mastery unit) - works

1. what do the letters dna stand for?
2. two scientists are given credit for discovering the structure

of dna. what is the name of those two scientists.
a.
b.

1. dna is a polymer, which means that is made up of many

repeating single units (monomers). what are the monomers
called?

1. the \backbone\ of the dna molecule is made up of two

components, what are these?
c.
d.

1. there are four different variations of these monomers (four different bases), what are the names of

those bases?
a.
b.
c
d.

1. these bases are of two different types of molecules: purines and pyrimidines. purines have

________ ring(s) in their structure, and pyrimidines have ________ ring(s) in their
structure.

1. the two bases that are purines are:

a.
b.

1. the two bases that are pyrimidines are:

a.
b.

Explanation:

• Question 6: Purines (adenine and guanine) have a double - ring structure, while pyrimidines (thymine and cytosine) have a single - ring structure.
• Question 7: Adenine and guanine are purines.
• Question 8: Thymine and cytosine are pyrimidines.

Answer:

1. Purines have two rings in their structure, and pyrimidines have one ring in their structure.
2. a. Adenine; b. Guanine
3. a. Thymine; b. Cytosine