BIOC 385 Final Exam Study Set questions
and answers graded A+
Producing an iPS cell is remarkable because the pathway:
A) for conversion is general, not specific.
B) is a highly irreversible reaction.
C) for conversion is very specific and limited.
D) produces a very unstable cell. - correct answer ✔✔A) for conversion is general, not specific.
What are the two main types of stem cells?
A) somatic and embryonic
B) somatic and epithelial
C) stromal and somatic
D) stromal and embryonic - correct answer ✔✔A) somatic and embryonic
Bicoid, Hunchback, Giant, and Kruppel are all transcription factor proteins involved in
__________ pattern.
A) even-skipped expression
B) odd-skipped expression
C) even-skipped transcription
D) odd-skipped transcription - correct answer ✔✔A) even-skipped expression
Predict the state of yeast when GAL 80 is bound to GAL 4 activation domain.
A) high glucose concentration
B) low glucose concentration
,C) high galactose concentration
D) low galactose concentration - correct answer ✔✔D) low galactose concentration
The proteins encoded by GAL1, GAL2, GAL7, and GAL10 are all needed for converting
__________ to glucose-6-phosphate.
A) glucose
B) fructose
C) sucrose
D) galactose - correct answer ✔✔D) galactose
The Swi-Snf complex affects chromatin by
A) creating extra nucleosomes near the promoter.
B) being a promoter.
C) creating a nucleosome-free region near the promoter.
D) transcribing the chromatin. - correct answer ✔✔C) creating a nucleosome-free region near
the promoter.
The portion of the histone that can be acetylated is the
A) head.
B) body.
C) tail.
D) arm. - correct answer ✔✔C) tail.
Together, the eight histone molecules are called the histone
A) octane.
B) octamer.
C) dimer.
,D) tetramer. - correct answer ✔✔B) octamer.
Transcriptional elongation is favored by the trp operon when tryptophan levels are:
A) high.
B) low.
C) constant.
D) The trp operon is not affected by tryptophan levels. - correct answer ✔✔B) low.
When the Trp repressor is bound to the trp operon, it results in the __________ by RNA
polymerase.
A) inhibition of transcriptional initiation
B) disruption of transcriptional elongation
C) initiation
D) enhancement of transcriptional elongation - correct answer ✔✔A) inhibition of
transcriptional initiation
High concentration of CI protein in the cell __________ expression of the __________.
A) prevents; lytic promoter
B) allows; lytic promoter
C) prevents; trp operon
D) allows; attenuator sequence - correct answer ✔✔A) prevents; lytic promoter
When LexA is autocleaved by RecA*, the SOS genes:
A) are repressed.
B) are activated.
C) are unaffected.
D) produce operons. - correct answer ✔✔B) are activated.
, When DNA is damaged, what protein is activated?
A) LexA repressor
B) RecA
C) SOS operon
D) lac operon - correct answer ✔✔B) RecA
What kind of control mechanism is ligand-induced binding of an activator protein?
A) positive
B) negative
C) neutral
D) covalent - correct answer ✔✔A) positive
A protein that has a weak affinity for a DNA site and is at ___________ concentrations of
protein will bind to DNA __________.
A) low; strongly
B) high; strongly
C) low; indiscriminately
D) high; indiscriminately - correct answer ✔✔B) high; strongly
A helix-turn-helix motif can best be described as a(n) __________ followed by a(n) __________.
A) α-helix; β-helix
B) α-helix; α-helix
C) β-helix; β-helix
D) β-helix; α-helix - correct answer ✔✔B) α-helix; α-helix
and answers graded A+
Producing an iPS cell is remarkable because the pathway:
A) for conversion is general, not specific.
B) is a highly irreversible reaction.
C) for conversion is very specific and limited.
D) produces a very unstable cell. - correct answer ✔✔A) for conversion is general, not specific.
What are the two main types of stem cells?
A) somatic and embryonic
B) somatic and epithelial
C) stromal and somatic
D) stromal and embryonic - correct answer ✔✔A) somatic and embryonic
Bicoid, Hunchback, Giant, and Kruppel are all transcription factor proteins involved in
__________ pattern.
A) even-skipped expression
B) odd-skipped expression
C) even-skipped transcription
D) odd-skipped transcription - correct answer ✔✔A) even-skipped expression
Predict the state of yeast when GAL 80 is bound to GAL 4 activation domain.
A) high glucose concentration
B) low glucose concentration
,C) high galactose concentration
D) low galactose concentration - correct answer ✔✔D) low galactose concentration
The proteins encoded by GAL1, GAL2, GAL7, and GAL10 are all needed for converting
__________ to glucose-6-phosphate.
A) glucose
B) fructose
C) sucrose
D) galactose - correct answer ✔✔D) galactose
The Swi-Snf complex affects chromatin by
A) creating extra nucleosomes near the promoter.
B) being a promoter.
C) creating a nucleosome-free region near the promoter.
D) transcribing the chromatin. - correct answer ✔✔C) creating a nucleosome-free region near
the promoter.
The portion of the histone that can be acetylated is the
A) head.
B) body.
C) tail.
D) arm. - correct answer ✔✔C) tail.
Together, the eight histone molecules are called the histone
A) octane.
B) octamer.
C) dimer.
,D) tetramer. - correct answer ✔✔B) octamer.
Transcriptional elongation is favored by the trp operon when tryptophan levels are:
A) high.
B) low.
C) constant.
D) The trp operon is not affected by tryptophan levels. - correct answer ✔✔B) low.
When the Trp repressor is bound to the trp operon, it results in the __________ by RNA
polymerase.
A) inhibition of transcriptional initiation
B) disruption of transcriptional elongation
C) initiation
D) enhancement of transcriptional elongation - correct answer ✔✔A) inhibition of
transcriptional initiation
High concentration of CI protein in the cell __________ expression of the __________.
A) prevents; lytic promoter
B) allows; lytic promoter
C) prevents; trp operon
D) allows; attenuator sequence - correct answer ✔✔A) prevents; lytic promoter
When LexA is autocleaved by RecA*, the SOS genes:
A) are repressed.
B) are activated.
C) are unaffected.
D) produce operons. - correct answer ✔✔B) are activated.
, When DNA is damaged, what protein is activated?
A) LexA repressor
B) RecA
C) SOS operon
D) lac operon - correct answer ✔✔B) RecA
What kind of control mechanism is ligand-induced binding of an activator protein?
A) positive
B) negative
C) neutral
D) covalent - correct answer ✔✔A) positive
A protein that has a weak affinity for a DNA site and is at ___________ concentrations of
protein will bind to DNA __________.
A) low; strongly
B) high; strongly
C) low; indiscriminately
D) high; indiscriminately - correct answer ✔✔B) high; strongly
A helix-turn-helix motif can best be described as a(n) __________ followed by a(n) __________.
A) α-helix; β-helix
B) α-helix; α-helix
C) β-helix; β-helix
D) β-helix; α-helix - correct answer ✔✔B) α-helix; α-helix
