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Drexel Bio 209 Final Exam 2026 Actual Complete Real
Exam Questions with verified Answers||Verified
Exam!!! (Verified Answers) Graded A+||Newest Exam!!!
Protein phosphorylation is an example of "covalent
modification" of proteins. However, it is NOT understood
what enzymes catalyze phosphorylation nor is the
importance of phosphorylation well understood. (TF) -
Answers-This statement is false. Protein kinase is what
gives the enzymes the ability to catalyze the
phosphorylation. The importance of this event is that it
alters the structure of the protein. The protein can be
modified by altering the function of the protein or by
deactivating it and it helps in various enzyme functions
such as cell growth, cell signaling, etc.
The peptide "backbone" consists of repetitive "units" of
amino group nitrogen-alpha carbon-carbonyl carbon,
moving from the N-terminus to the C-terminus. (TF) -
Answers-This statement is true. The peptide backbone
has to move from the N-terminus to the C-terminus
because of the attraction ribosomes have to the N-
terminus that starts the reaction and then the signal to
stop the reaction occurs at the C-terminus.
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Proline is distinctive from the other amino acids discussed
in class in that it is a cyclic amino acid with a secondary
amino group bonded to the carboxyl group carbon
(Assume the statement refers to proline as a free amino
acid, not part of a
polypeptide). (TF) - Answers-This statement is false. While
Proline is a cyclic amino acid the secondary amino group
is bonded to a Carbon atom and it is not bonded to a
carboxyl group carbon.
In b-pleated sheets the structure is stabilized by hydrogen
bonding between amino acid R groups on the adjacent
polypeptide strands that make up the b-pleated sheet.
(TF) - Answers-This statement is false. Hydrogen bonding
occurs between the amine groups and the carbonyl
groups of different chains on adjacent polypeptide strands
that make up the b-pleated sheet.
The hydrophobic effect maximizes the area of contact
between water and nonpolar groups. (TF) - Answers-This
statement is false. The hydrophobic effect maximizes the
area of contact between water and polar groups, which
are the phosphorus heads. The phosphorus heads come
in contact with the water since they are both polar and the
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nonpolar tails all interact with each other to create more
stability and to create less contact with water.
Which of the following is NOT true about enzymes -
Answers-they increase E of a reaction
Which of the following is NOT an example of a non-
covalent interaction/bond? - Answers-Disulfide bond (this
is covalent)
Intrachain hydrogen bonding involving the peptide
backbone would describe which of the following
structures? - Answers-Alpha-helix
The peptide sequence, YRVHLWN, is part of an a-helix.
With which amino acid would arginine form a hydrogen
bond? - Answers-Tryptophan (this answer is based on the
"n+4" rule discussed in class)
A biochemical reaction, X àY, has an equilibrium constant
of 2500 in the presence of an enzyme that catalyzes the
formation of the product, Y, from the substrate, X. Which of
the following statements would best describe what
Drexel Bio 209 Final Exam 2026 Actual Complete Real
Exam Questions with verified Answers||Verified
Exam!!! (Verified Answers) Graded A+||Newest Exam!!!
Protein phosphorylation is an example of "covalent
modification" of proteins. However, it is NOT understood
what enzymes catalyze phosphorylation nor is the
importance of phosphorylation well understood. (TF) -
Answers-This statement is false. Protein kinase is what
gives the enzymes the ability to catalyze the
phosphorylation. The importance of this event is that it
alters the structure of the protein. The protein can be
modified by altering the function of the protein or by
deactivating it and it helps in various enzyme functions
such as cell growth, cell signaling, etc.
The peptide "backbone" consists of repetitive "units" of
amino group nitrogen-alpha carbon-carbonyl carbon,
moving from the N-terminus to the C-terminus. (TF) -
Answers-This statement is true. The peptide backbone
has to move from the N-terminus to the C-terminus
because of the attraction ribosomes have to the N-
terminus that starts the reaction and then the signal to
stop the reaction occurs at the C-terminus.
,2|Page
Proline is distinctive from the other amino acids discussed
in class in that it is a cyclic amino acid with a secondary
amino group bonded to the carboxyl group carbon
(Assume the statement refers to proline as a free amino
acid, not part of a
polypeptide). (TF) - Answers-This statement is false. While
Proline is a cyclic amino acid the secondary amino group
is bonded to a Carbon atom and it is not bonded to a
carboxyl group carbon.
In b-pleated sheets the structure is stabilized by hydrogen
bonding between amino acid R groups on the adjacent
polypeptide strands that make up the b-pleated sheet.
(TF) - Answers-This statement is false. Hydrogen bonding
occurs between the amine groups and the carbonyl
groups of different chains on adjacent polypeptide strands
that make up the b-pleated sheet.
The hydrophobic effect maximizes the area of contact
between water and nonpolar groups. (TF) - Answers-This
statement is false. The hydrophobic effect maximizes the
area of contact between water and polar groups, which
are the phosphorus heads. The phosphorus heads come
in contact with the water since they are both polar and the
, 3|Page
nonpolar tails all interact with each other to create more
stability and to create less contact with water.
Which of the following is NOT true about enzymes -
Answers-they increase E of a reaction
Which of the following is NOT an example of a non-
covalent interaction/bond? - Answers-Disulfide bond (this
is covalent)
Intrachain hydrogen bonding involving the peptide
backbone would describe which of the following
structures? - Answers-Alpha-helix
The peptide sequence, YRVHLWN, is part of an a-helix.
With which amino acid would arginine form a hydrogen
bond? - Answers-Tryptophan (this answer is based on the
"n+4" rule discussed in class)
A biochemical reaction, X àY, has an equilibrium constant
of 2500 in the presence of an enzyme that catalyzes the
formation of the product, Y, from the substrate, X. Which of
the following statements would best describe what
