Exam (elaborations)
WGU C785 Biochemistry Preassessment – Questions With Solutions
WGU C785 Biochemistry Preassessment – Questions With Solutions
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WGU C785 Biochemistry Preassessment –Questions With Solutions
Assuming 100% reaction efficiency, how many DNA copies are created after
the completion of four complete PCR cycles? ✔️Ans - 16
What is the function of DNA polymerase in the process of PCR? ✔️Ans - 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?
✔️Ans - A and B
115 116 117 118 − Amino Acid Number
Tyr Gly Thr Pro − Amino Acid Sequence
TAC GGG ACA CCA − DNA Sequence
What is the amino acid in position 118 that results from a single nucleotide
insertion immediately following the three guanines that encode for glycine
116? ✔️Ans - Thr
In sickle-cell disease, the glutamic acid (Glu) at position number seven is
mutated to valine (Val).
What change in codons corresponds to this mutation? ✔️Ans - GAA to GTA
, Which type of mammalian DNA damage repair requires the presence of the
chromosome that is homologous to the damaged chromosome? ✔️Ans -
Recombination
Xeroderma pigmentosum (XP) is a recessive genetic disease that occurs when
one or more of the genes that perform nucleotide excision repair are
nonfunctional.
Why do XP patients have a much higher incidence of skin cancer than the
general population? ✔️Ans - The mutation rate of all other genes is higher
due to failure to repair.
Which mRNA sequence results in a polypeptide that contains three amino
acids? ✔️Ans - 5' - CUU GAU ACU UAG - 3'
Which template strand DNA sequence would result in the amino acid (Ser)?
✔️Ans - 5' - CGA - 3'
What is the complementary sequence for the following DNA sequence?
5' - GCC ATC TCG AAT - 3' ✔️Ans - 5' - ATT CGA GAT GGC - 3'
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.
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