WGU Biochemistry PA (Latest 2023 - 2024)
Actual Questions and Answers 100% Correct
- What is the complementary sequence for the following DNA sequence? 5'
- GCC ATC TCG AAT - 3'
Answer: 5' - ATT CGA GAT GGC - 3'
- Assuming 100% reaction efficiency, how many DNA copies are created after
the completion of four complete PCR cycles?
Answer: 16
- What is the function of DNA polymerase in the process of PCR?
Answer: It recognizes the primers and uses the available dNTPs to replicate the
template DNA sequence.
- What are possible blood types of the parents of a patient with blood type AB?
Answer: A and B
- Studies have shown that increased expression of two genes called SIRT1 and
SIRT2 is associated with chronic exposure to cocaine and contributes to drug addiction.What difference in the regions of the SIRT1 and SIRT2 genes in people addicted to cocaine increases their expression?
Answer: The nucleosomes become more widely spaced.
- Mice with low levels of agouti gene expression tend to have yellow fur and are
obese, while mice with higher levels of expression are brown and of normal weight.Studies show that expression of the agouti gene in mice can be controlled by 1 / 2
epigenetics. What scenario describes epigenetic regulation of the agouti gene?Answer: Mother mice fed methyl-rich diets during pregnancy give birth to offspring with decreased agouti gene expression compared to those fed a methyl-poor diet.
- Oxidative damage to DNA can often result in the alteration of a single
nucleotide. Which DNA repair mechanism would repair this type of damage?- Answer: The mutation rate of all other genes is higher due to failure to repair.
- Which reaction is responsible for the formation of polypeptides?
Answer: Dehydra tion
- Which term describes the order of amino acids in a peptide chain?
Answer: Primary structure
- When using heat to denature a protein, which force is the first to be
disrupted as temperature increases?
Answer: Hydrophobic interactions
- A commonly used technique for protein denaturation is adding an acid or a
base to dramatically change the pH. Which force is most impacted by this change in pH?
Answer: Ionic bonds
- An active elderly patient is becoming frequently disoriented, having trouble
recalling her daily routine, and becoming aggravated easily. She forgets words and places and has difficulty recognizing her children. Which bio- chemical event is responsible for this patient's behavior?
Answer: Protein aggregation
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