WGU 785 Final Exam Latest 2021/22 with Complete Answers
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Course
BioChem C785
Institution
Western Governors University
WGU 785 Final Exam Latest 2021/22 with Complete Answers-Hemophilia Pedigree - Father has hemophilia, mother does not. What is the outcome for their kids?
- His daughters would be carriers. This is x-link recessive.
Autosomal:
Dominant: - Autosomal: males and females equally affected.
Domina...
wgu 785 final exam latest 202122 with complete answers
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WGU 785 Final Exam Latest 2021/22 with Complete Answers
Hemophilia Pedigree - Father has hemophilia, mother does not. What is the outcome
for their kids?
- His daughters would be carriers. This is x-link recessive.
polymerase chain reaction (PCR)
- The process of copying DNA in the lab. Uses Template DNA, Nucleotides (dNTPS),
DNA Polymerase, and DNA primers.
3 Steps of PCR
- 1. Denaturation: DNA is heated to 95C to separate it.
2. Annealing: reaction is cooled to 50C; primers stick to the DNA you want to copy
and add DNA polymerase.
3. Elongation: reaction heated to 70C and DNA polymerase, adding nucleotides
building a new DNA strand.
Base Excision Repair (BER)
- How you repair a mutation. BER is used to repair damage to a base caused by
harmful molecules. You remove the base that is damaged and replace it. *BER
removes a single nucleotide*
DNA glycolsylase –
sees damaged DNA and removes it.
DNA polymerase-
puts the right one back in while DNA ligase seals it.
Mismatch repair (MMR) occurs during:
- replication. DNA polymerase proofreads but sometimes a mismatch pair gets
through. MMR removes a large section of the nucleotides from the new DNA and
DNA polymerase tries again. (Ex: C-T instead of C-A)
Mismatch Repair corrects what kind of DNA damage?
- When a base is mismatched due to errors in replication. Such as G-T instead of G-C.
DNA polymerase comes by and fixes it.
What happens when DNA polymerase binds to DNA to make RNA?
,- TRANSCRIPTION! DNA polymerase takes the individual nucleotides and matches
them to the parental sequences to ensure a correct pair. It must bind with RNA primer
to work.
What is needed for DNA replication?
- DNA polymerase
Nonsense Mutation
- Change in 1 nucleotide produces a STOP codon Stop= nonsense because it is no
more.
Silent Mutation
- Change in 1 nucleotide but codes for the same amino acid. Silent= the change doesn't
change the name of the protein
Missense Mutation
- Change in 1 nucleotide leads to a code for a different amino acid. Missense = mistake
was made.
What happends during RNA splicing?
- During RNA splicing introns are cut out, the remaining exons are joined together.
5'ATG AGT CTC TCT 3'
Find the DNA template strand.
- 3'TAC TCA GAG AGA 5'
The DNA template strand is complimentary. So start with the opposite number, then go
L-R with the complimentary letter.
5'ATG AGT CTC TCT 3'
What is the corresonding mRNA sequence?
- 5'AUG AGU CUC UCU 3'
This sequence is the same as the coding strand except T changes to U because it is
RNA. RNA doesn't have T.
How would a mutation from CTC to ATC affect the protein sequence? (CTC/ATC -
coding strand, AUC - mRNA strand)
- This will make a missense mutation because it changes the name of the protein. (look
at the chart provided.) missense = mistake
DNA replication process - DNA ->Transcription -> RNA -> Translation ->
Polypeptide
, Describe how you would find what ionized Alanine looks like.
- This is an amino acid. Look for the "R" group. Alanine is a hydrophobic amino acid
that has CH3. It is a weak interaction. An ionized acid will have a + or - charge.
Describe what causes the misfolding of protein in Alzheimer's Disease. –
Protein misfolding is caused by intracellular tangles and extracellular plaques (senile
plaques) caused by abnormal protein aggregation.
TAU is fibrous material inside cells where the connections are lost. This becomes
defective and forms filaments in the neuron.
Amyloid-Beta is a large precursor protein in the cell. Excess amyloid-beta creates
senile plaques. This starts in the hippocampus and moves up.
Describe the process of neurodegenerative protein aggregation.
- Alzheimer's is the most common neurodegenerative disease. The formation of
aggregated amyloid-beta fibers is another characterisitc of Alzheimer's. However,
neurodegeneration and memory loss can be detected before amyloid fibers accumulate
in the brain.
What are the molecules that help denatured proteins with folding?
- Molecular chaperones are protein helpers. They bind to the newly made polypeptide
and enable proper folding. Proper protein folding is vital b/c proteins that do not fold
properly can lead to a variety of diseases. Normally, the chaperones that help new
proteins fold can also help misfolded proteins refold into the correct structure.
Genetic mutations that substitute one amino acid for another can cause incorrect
folding.
What are the 4 levels of protein structure?
- 1. Primary-chain of amino acids. PEPTIDE bonds form a polypeptide chain. This is a
covalent bond (very strong) and does not denature.
2. Secondary-alpha helix and beta sheet. HYDROGEN bonds that contain the carboxyl
group and amino groups. Denatured by salt and pH change.
3. Tertiary-side chain interaction (R group). Changes are seen with high temp, salt,
change in pH, and reducing agents. (ex: sickle cell, arthritis, hemophilia)
4. Quarternary-more than 1 polypeptide. Change seen with increased temp. (Ex: Hgb)
Hydrogen bonds are formed from
- 2 polar amino acids.
(Contains Oxygen and nitrogen-OH, NH, NH2. On exterior surface)
What structure would be unaffected by complete denaturation of its multi-subunit?
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