wgu c785 biochemistry final exam latest 20222023 questions with explained answerslatest update 20222023 verified grade a
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WGU C785 BIOCHEMISTRY FINAL EXAM LATEST
2022/2023 QUESTIONS WITH EXPLAINED
ANSWERS
1. The polymerase chain reaction is a tool used to study protein structure.
True
False (correct answers)False
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PCR is a tool used to amplify a specific segment of DNA.
What color is the primer in the following diagram?
Red
Purple
Blue (correct answers)Red
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Recall from the section on DNA replication that DNA polymerase needs a primer to begin DNA synthesis.
This requirement means the primers will direct the DNA polymerase to only synthesize complementary
strands of the target DNA. (Note: In DNA replication, the primers are RNA primers, while PCR generally
uses DNA primers because they are more stable.)
dNTPs are DNA nucleotides used in PCR.
True
,False (correct answers)True
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dNTPs stands for deoxynucleotide triphosphates, which are the nucleotides used in DNA synthesis.
A thermocycler is a machine used for PCR that varies the temperature of a sample.
True
False (correct answers)True
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For PCR, in each cycle, the two strands of the duplex DNA are separated by heating, then the reaction
mixture is cooled to allow the primers to anneal (or pair) to their complementary segments on the DNA.
Next, the DNA polymerase directs the synthesis of the complementary strands. The use of a heat-stable
DNA polymerase eliminates the need to add fresh enzyme after each round of heating (heat inactivates
most enzymes). Hence, in the presence of sufficient quantities of primers and dNTPs, PCR is carried out
simply by cycling through the different temperatures for strand separation, primer annealing, and DNA
synthesis.
The thermocycler is the machine that is used to vary the temperature of the samples.
DNA polymerase is used in DNA replication and in PCR.
True
False (correct answers)True
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Both PCR and DNA replication require DNA polymerase to make new copies of DNA.
,Which of the following changes can NOT be detected using PCR?
Differences in DNA sequence
Epigenetic changes
Deletions
Insertions (correct answers)Epigenetic changes
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Epigenetic changes do not affect the sequence of the DNA. PCR is used to look at the DNA sequence.
Which of the following components is NOT used in PCR?
DNA template
DNA nucleotides
RNA polymerase
Primers (correct answers)RNA polymerase
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PCR makes a DNA copy, so DNA polymerase is used.
Assuming there is one copy of the target DNA sequence before PCR, how many copies of DNA are there
after 5 PCR cycles?
256
6
65,536
, 16
32 (correct answers)32
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Each cycles double the numbers of DNA copy. Round 1: 1->2. Round 2: 2 ->4. Round 3: 4 -> 8. Round 4: 8
->16. Round 5: 16 ->32.
DNA polymerase can synthesize new DNA strands in which direction?
3' to 5'
5' to 3'
any direction
N-terminus to C-terminus (correct answers)5' to 3'
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DNA needs a free 3' end to bind to and initiate synthesis of a DNA. It synthesizes in a 5' to 3' direction.
The following are steps involved in a polymerase chain reaction. Which is the correct order:
Elongation, denaturation, and annealing
Denaturation, annealing, and elongation
Annealing, elongation, and denaturation
Elongation, annealing, and denaturation (correct answers)Denaturation, annealing, and elongation
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