WGU Biochemistry C624, 2025/2026 – Questions and Verified Answers, A+ GradeWGU Biochemistry C624 – Practice

WGU Biochemistry C624 questions and
answers 2025\2026 A+ Grade

Primary structure consists of the order of ______ in a protein. These are held together with ______
bonds that are formed by a ______ reaction.
- correct answer Amino Acids, Peptide, hydration



Several types of side chain interactions stabilize the tertiary structure of proteins, including which of the
following?
- correct answer Ion pairs, hydrophobic interactions, hydrogen bonds, disulfide bonds



Which of the following statements is true about the secondary structure of proteins? a. It includes alpha
helices as a common form.

b. It involves hydrogen bonding between the backbone atoms.

c. All of these.

d. It includes beta pleated sheets as a common form.
- correct answer c. All of these.



In order to fulfill their function, proteins must fold in proper, three-dimensional conformations. Which
one of the following molecules, available in a cell, is likely to help a protein fold properly?
- correct answer Chaperone



Which of the following is true about a mis-folded protein? a. All of these.

b. It can be the result of denaturation.

c. It can cause protein aggregation.

d. It will lose its normal function.

e. It can be degraded by the cell.
- correct answer Which of the following is true about a mis-folded protein?

,- correct answer Which of the following amino acids would you expect to find in the interior of a protein
most often?




- correct answer Which of the following amino acids would you expect to find most often on the exterior
surface of a protein?

question has 2 answers




- correct answer Which of the following amino acids would you expect to find most often on the exterior
surface of a protein?



B - Carboxylic acid! Peptide bonds are formed between the amino group (A) and carboxylic acid group
(B) of amino acids.

A - Amino group! Peptide bonds are formed between the amino group (A) and carboxylic acid group (B)
of amino acids.
- correct answer Which part(s) of the amino acid below can be involved in peptide bond formation?



Which part(s) of the amino acid below contributes to tertiary structure stabilization?

a. C - Alpha Carbon

b. B - Carboxylic Acid

c. A - Amino group

d. D - R group
- correct answer d. D - R group Tertiary structure is stabilized primarily by interactions between different
R groups.



Drag the name of the protein structure level to the part of the amino acid that primarily contributes to
that structure level. Primary Structure

Secondary Structure

Tertiary Structure

Quaternary Structure
- correct answer Primary Structure Secondary Structure

,Tertiary Structure

Quaternary Structure



You are designing a piece of DNA for a project and must select the appropriate nitrogenous bases.
Which combination of nitrogenous bases would you find most suitable for your work?

a. Adenine, Guanine, Thymine, Cytosine.

b. Thymine, Uracil, Adenine, Cytosine

c. Adenine Guanine, Uracil and Thymine

d. Adenine, Thymine, Cytosine, Uracil
- correct answer a. Adenine, Guanine, Thymine, Cytosine

These nitrogenous bases, in combination with deoxyribose sugar and phosphate, form the nucleotides
that are bonded together to form a long polymer of DNA - the carrier of genetic information.



d. 5'-TACTAGGAA-3' The bases on the newly made daughter strand are complementary to the bases on
the template strand, but with the opposite 5' and 3' orientation.
- correct answer The DNA sequence 3'-ATGATCCTT-5' is part of the template strand during DNA
replication. Which of the following would be the correct sequence for the newly made DNA?



Select one:

a. 5'-ATGATCCTT-3'

b. 5'-GCAGCTTCC-3'

c. 5'-UACUAGGAA-3'

d. 5'-TACTAGGAA-3



c. All of these. All of these statements about RNA are true. The cell contains mRNA, rRNA, and tRNA
molecules, RNA is single stranded, RNA contains a ribose sugar in the sugar-phosphate backbone, and
RNA nucleotides include the bases A, U, C, and G.
- correct answer a. RNA is single stranded and contains a ribose sugar in the sugar-phosphate backbone.

b. RNA nucleotides include the bases A, U, C, and G.

c. All of these.

d. There are several types of RNA in the cell, including mRNA, rRNA, and tRNA.

, a. Adenine, Guanine, Thymine, Cytosine

These nitrogenous bases, in combination with deoxyribose sugar and phosphate, form the nucleotides
that are bonded together to form a long polymer of DNA - the carrier of genetic information.
- correct answer You are designing a piece of DNA for a project and must select the appropriate
nitrogenous bases. Which combination of nitrogenous bases would you find most suitable for your
work?



Select one:

a. Adenine, Guanine, Thymine, Cytosine

b. Thymine, Uracil, Adenine, Cytosine

c. Adenine Guanine, Uracil and Thymine

d. Adenine, Thymine, Cytosine, Uracil



c. 5'-TACTAGGAA-3'

The bases on the newly made daughter strand are complementary to the bases on the template strand,
but with the opposite 5' and 3' orientation.
- correct answer The DNA sequence 3'-ATGATCCTT-5' is part of the template strand during DNA
replication. Which of the following would be the correct sequence for the newly made DNA?



Select one:

a. 5'-ATGATCCTT-3'

b. 5'-GCAGCTTCC-3'

c. 5'-TACTAGGAA-3'

d. 5'-UACUAGGAA-3'



b. All of these! All of these statements about RNA are true. The cell contains mRNA, rRNA, and tRNA
molecules, RNA is single stranded, RNA contains a ribose sugar in the sugar-phosphate backbone, and
RNA nucleotides include the bases A, U, C, and G.
- correct answer Which of the following statements is TRUE about RNA?



Select one:

a. There are several types of RNA in the cell, including mRNA, rRNA, and tRNA.