Unit 2, Lesson 3 – DNA and Proteins
1. B – The molecule contains a nitrogen
atom and an R group, therefore it is
an amino acid.
2. A – Deoxyribose is the sugar found in
DNA not RNA.
3. C – Nucleotides contain a phosphate
group, 5-carbon sugar, and a
nitogenous base. The nirotgenous
bases come in 4 varieties and
participate in hydrogen bonding
interactions.
4. A – Proteins do not encode genetic
information (nucleic acids do)
Unit 2, Lesson 3 – DNA and Proteins
• Part A Answer:
Proteins and nucleic acids are both long unbranched
polymers made up of monomers. Proteins are
made of amino acids and nucleic acids and made of
nucleotides. Both types are joined be dehydrated
synthesis.
Unit 2, Lesson 3 – DNA and Proteins
• Part B Answer:
Nucleotides are variable, the sequence of
nucleotides allowing DNA or RNA to encode genetic
information. Hydrogen bonding between
nucleotides allows different nucleic acids strands to
bond (for example, in a DNA double strand)
Unit 2, Lesson 3 – DNA and Proteins
• Part C Answer:
Amino acids are variable with 20 different types.
The variable R groups of amino acids allow for a
large variety of proteins to be made. The R groups
have different chemical and physical properties that
allow the protein to take on a specific 3D shape.