BIOC Exam 4 Practice Test 2024/2025 with 100% correct answers
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Course
BIOC E4 Practice Te
Institution
BIOC E4 Practice Te
An Ames test of a compound suspected to be a mutagen was examined before and after incubation with rat liver extract. Based on the results shown, what do you conclude? correct answersAnswer:
Compound is mutagenic without liver enzymes and this activity is further enhanced by liver enzymes.
Matc...
An Ames test of a compound suspected to be a mutagen was examined before and after incubation with
rat liver extract. Based on the results shown, what do you conclude? correct answersAnswer:
Compound is mutagenic without liver enzymes and this activity is further enhanced by liver enzymes.
Match the description of each mode of regulation with the illustration diagrammed at the right and
record your answer in the order of
1 --> 4. correct answersAnswer:
1. B Ligand-regulated de-repression
2. A Ligand-regulated repression
3. D Ligand-regulated activation
4. C Ligand-regulated de-activation
B, A, D, C
Lynch syndrome is a human genetic disease characterized by ~100-fold higher incidence of colon cancer
in men and women - and uterine cancer in women - by the age 50, as compared to the general
population. Which statement below best describes the genetic cause of Lynch syndrome. correct
answersAnswer:
Lynch syndrome is caused by defects in the human mismatch repair enzymes hMLH1 and hMSH2.
Record T (true) or F (false) for statements below regarding protein synthesis. Record as a --> e. correct
answersAnswer:
T a. Prokaryotic and eukaryotic ribosomes both contain RNA that functions as a catalytic enzyme.
T b. The wobble position in tRNA is 5' nucleotide in the anti-codon and 3' nucleotide in mRNA codon.
T c. Ribosomal E, P, and A sites align tRNA anti-codons with the corresponding mRNA codons.
F d. Accurate protein synthesis requires tRNA synthetases to link GTP to 3' end of tRNA molecules.
F e. Cells contain only ~30 tRNA molecules, of which 3 correspond to termination tRNA molecules.
, T, T, T, F, F
Why are the BRCA1/BRCA2 genes considered tumor suppressor genes? correct answersAnswer:
Because BRCA1/BRCA2 encode DNA repair enzymes that normally prevent cancer mutations.
Five different TATA Binding Protein (TBP) mutations are shown below. If these mutations were located in
the region of the protein that is required for direct binding to the TATAA DNA sequence, which mutation
would most likely be a conservative missense mutation that does not alter TBP function? correct
answersAnswer:
Lys --> Arg
Which of the following statements about pluripotent stem cells is true? correct answersAnswer:
They can develop into many different cell types under the right conditions.
Choose the best answer that correctly identifies the labeled DNA and RNA sequences. Your choices for A,
B, C, D, E are shown in the box
Which five statements below are correct regarding the process of prokaryotic DNA replication?
1. b-clamp keeps DNA Pol bound to DNA
2. Coding strand serves as the template
3. DNA replication is semiconservative
4. Gyrase unwinds the DNA double helix
5. DNA Pol I synthesizes leading strand
6. Telomerase replicates telomeres
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