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BICH 431 Exam 3 Questions and Answers Latest Update
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BICH 431 Exam 3 Questions and Answers Latest Update
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BICH 431 Exam 3 Questions andAnswers Latest Update
The genetic code is...
A. Degenerate
B. Cumulative
C. Additive
D. Complex - Answer-A
There are less tRNAs than codons, therefore not all sense codons are read. True or
False? - Answer-F
Which position in a codon confers the ability to 'wobble', or allow tRNAs the ability to do
double duty?
A. Second
B. Third
C. First
D. None of the above - Answer-B
U normally base pairs with A, but it can form two hydrogen bonds with which base to
form a weak pair? - Answer-G
List all pairing combination for G with wobble included. - Answer-U or C
List all pairing combinations for A with wobble included. - Answer-U
List all pairing combination for U with wobble included. - Answer-A or G
List all pairing combinations for C with wobble included. - Answer-G
List all pairing combinations for I with wobble included. - Answer-A, U, C
Which of the following is the shape of tRNA?
A. None of these
B. Butterfly
C. Hairpin
D. Cloverleaf - Answer-D
The reading frame includes the region from transcription factor binding, to the stop
codon. True or False? - Answer-F
Genetic code is overlapping, true or false? - Answer-F
,Due to the non-overlapping nature of the genetic code, a point mutation will cause
which of the following?
A. Change in multiple amino acids
B. Reading frame shift
C. Change in a single amino acid
D. No change will be observed - Answer-C
The genetic code has no gaps. True or False? - Answer-T
Which of the following best describes the effects of a frame shift mutation:
A. Cause changes in every amino acid after the shift.
B. Change in only one amino acid.
C. No change will be observed.
D. Depends on the frame shift. - Answer-A
What is the outcome of a triple insertion mutation?
A. No frameshift, only an additional amino acid will be made.
B. Frameshift, causing changes in all amino acids after the mutation.
C. Deletion of an amino acid.
D. No effect will be seen. - Answer-A
What is the outcome of an insertion + deletion mutation?
A. No effect will be seen.
B. Deletion of a codon.
C. Total frameshift.
D. Frameshift in only codons between the insertion and deletion. - Answer-D
Classical genetics studies function of proteins and the illustration of biological pathways.
True or False? - Answer-F
Which of the following studies of genetics focuses on rules that govern the segregation
of genetic information?
A. Modern
B. Classical - Answer-B
What is the effect of a suppressor modifier screen on mutants?
A. Mutant disappears.
B. Mutant becomes stronger.
C. Mutant becomes weaker.
D. Mutant does not change - Answer-D
What is the effect of enhancers on mutant phenotypes?
A. Mutant is weakened.
B. Mutant disappears.
C. Mutant becomes stronger.
D. Mutant does not change. - Answer-C
, Which of the following best describes a true revertant?
A. Mutation that reverses O.G. mutation back to WT.
B. Mutation that strengthens mutant.
C. Mutation that weakens mutant.
D. None of the above. - Answer-A
True revertants fix mutations by altering code outside the 'damaged' gene. True or
false? - Answer-F
Intragenic mutations can be true revertants or secondary mutations in different genes
that restore function. True or false? - Answer-T
Which of the following strains of bacteriophage T4 enabled the discover of nonsense
mutation suppressors?
A. Cerulean
B. Red
C. Amber
D. Agouti - Answer-C
Which best describes the function of an informational suppressor?
A. Fixes mutations via alterations within the gene.
B. Fixes mutations via alterations outside the gene.
C. Alters txn or translation machinerty to restore function.
D. None of the above. - Answer-C
In the amber T4 experiment, how did the tRNA mutation suppressor supF suppress the
UAG amber mutation?
A. Changed an anticodon to recognize nonsense stop codon.
B. Altered genetic sequence to mitigate nonsense codon.
C. Added an extra copy to compensate for the mutation.
D. Introduced a new stop codon to fix error. - Answer-A
Non-sense mutations cannot be suppressed by mutant tRNAs, true or false? - Answer-F
Which of the following are the four key components of protein translation? (free
response) - Answer-mRNA, tRNA synthetase, ribosome, tRNA
Which of the following best describes monocystronic mRNA?
A. mRNA with multiple ORF sites.
B. mRNA with a single ORF site.
C. mRNA with no ORF sites.
D. None of the above - Answer-B
Polycystronic mRNA allows for translation without ribosome dissociation between
genes, true or false? - Answer-T
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