Portage Biochemistry Module 3 Exam questions
and answers 2026\2027 A+ Grade
List the 5 functions of proteins
- correct answer Transport, hormones, catalysis, structure, protection
Define transport function of proteins and example
- correct answer helps to move molecules around the cell and organism, ex: Hemoglobin is a blood-
based protein that carries oxygen from the lungs to tissue
Define hormone function of proteins and example
- correct answer Hormones communicate messages between cells, ex: relaxin is a protein hormone that
helps women relax pelvic ligaments during childbirth
Define catalysis function of proteins and example
- correct answer Enzymes speed up or catalyze chemical rxns, ex: protease enzyme breaks down
proteins in cells to help organisms recycle unneeded proteins
Define structure function of proteins and example
- correct answer Proteins give strength to cells, organelles and tissues, ex: collagen is the structural
protein in cartilage, skin and tendons
Define amino acids
- correct answer building blocks of proteins
What functional groups do amino acids contain?
- correct answer amine and carboxylic acid
What permits all amino acids to link together in a protein?
- correct answer Each amino acid having the same groups
, What is the R group in an amino acid and how are they grouped?
- correct answer Side chain of the amino acid; there are 20 different side chains that differ in
composition/size/charge so side chains are grouped by charge, size and polarity
What pH do amino acids exist at?
- correct answer 7.4
What do amino acids lose and gain at pH of 7.4?
- correct answer Lose the carboxylic acid H group and gain an extra proton (NH3+)
Name the 5 sets of amino acids
- correct answer Non-polar aliphatic, non-polar aromatic, polar neutral, acidic, basic
Define non-polar aliphatic amino acids
- correct answer Straight chain amino acids
Name the 7 nonpolar, aliphatic amino acids
- correct answer glycine (Gly, G), alanine (Ala, A), proline (Pro, P), valine (Val, V), leucine (Leu, L),
isoleucine (Ile, I), methionine (Met, M)
Name the 7 nonpolar, aliphatic amino acids in abbreviations
- correct answer Gly, Ala, Val, Pro, Leu, Ile, Met
Describe aliphatic amino acids and their location in proteins
- correct answer Relatively small which allows them to interact with other groups, found in interior of
protein away from water with other aliphatic groups (fold together)
Why is proline unique?
- correct answer its side chain makes a ring by bonding with its main chain nitrogen
How do non-polar aromatic groups compare to aliphatic? (5 reasons)
- correct answer similar to aliphatic in that they are non-polar, but the side chains of these compounds
and answers 2026\2027 A+ Grade
List the 5 functions of proteins
- correct answer Transport, hormones, catalysis, structure, protection
Define transport function of proteins and example
- correct answer helps to move molecules around the cell and organism, ex: Hemoglobin is a blood-
based protein that carries oxygen from the lungs to tissue
Define hormone function of proteins and example
- correct answer Hormones communicate messages between cells, ex: relaxin is a protein hormone that
helps women relax pelvic ligaments during childbirth
Define catalysis function of proteins and example
- correct answer Enzymes speed up or catalyze chemical rxns, ex: protease enzyme breaks down
proteins in cells to help organisms recycle unneeded proteins
Define structure function of proteins and example
- correct answer Proteins give strength to cells, organelles and tissues, ex: collagen is the structural
protein in cartilage, skin and tendons
Define amino acids
- correct answer building blocks of proteins
What functional groups do amino acids contain?
- correct answer amine and carboxylic acid
What permits all amino acids to link together in a protein?
- correct answer Each amino acid having the same groups
, What is the R group in an amino acid and how are they grouped?
- correct answer Side chain of the amino acid; there are 20 different side chains that differ in
composition/size/charge so side chains are grouped by charge, size and polarity
What pH do amino acids exist at?
- correct answer 7.4
What do amino acids lose and gain at pH of 7.4?
- correct answer Lose the carboxylic acid H group and gain an extra proton (NH3+)
Name the 5 sets of amino acids
- correct answer Non-polar aliphatic, non-polar aromatic, polar neutral, acidic, basic
Define non-polar aliphatic amino acids
- correct answer Straight chain amino acids
Name the 7 nonpolar, aliphatic amino acids
- correct answer glycine (Gly, G), alanine (Ala, A), proline (Pro, P), valine (Val, V), leucine (Leu, L),
isoleucine (Ile, I), methionine (Met, M)
Name the 7 nonpolar, aliphatic amino acids in abbreviations
- correct answer Gly, Ala, Val, Pro, Leu, Ile, Met
Describe aliphatic amino acids and their location in proteins
- correct answer Relatively small which allows them to interact with other groups, found in interior of
protein away from water with other aliphatic groups (fold together)
Why is proline unique?
- correct answer its side chain makes a ring by bonding with its main chain nitrogen
How do non-polar aromatic groups compare to aliphatic? (5 reasons)
- correct answer similar to aliphatic in that they are non-polar, but the side chains of these compounds
