BIOD 101 Module 4 Problem Set

BIOD 101 Module 4 Problem Set

Compare and contrast purines and pyrimidines and provide examples of each.
Answer: Purines contain two carbon-nitrogen rings and four nitrogen
atoms, while the pyrimidines contain one carbon-nitrogen ring and two
nitrogen atoms. Adenine and guanine are purines, and thymine and
cytosine are pyrimidines (See section 4.1 in module).
Describe the structure and arrangement of DNA.
Answer: DNA is a double helix, which means it is composed of two helical
strands. The two strands are held together by the ‘rungs’, which are madeof
complementary pairs. The pairs are held together by weak hydrogen bonds.
Just as the nucleotides are paired in a complementary fashion, the
strands are also arranged in a complementary- type pattern and are said
to be antiparallel. In this antiparallel arrangement, the strands are
oriented with one strand being in the 5’→3’ orientation and the other
strand inthe 3’→5’ orientation (See section 4.1 in module).
What is a genome?
Answer: The entire sequence of the paired bases is called a genome.
Multiple Choice:
is a broad term that includes all of the body’s cells except gametes.