BIOL 351 Exam 4 Newest 2025 Questions
And Well-Elaborated Answers/New!!
, Mutualism - CORRECT ANSWER-A relationship between two species in which both species
benefit
tryptophan - CORRECT ANSWER-What doe Buchnera aphidicola provide to aphids in their
mutualistic relationship?
amino acids - CORRECT ANSWER-what do aphids provide Buchnera aphidicola in their
mutualistic relationship
True - CORRECT ANSWER-True/False. 75% of the Buchnera genome is gone as a result of
mutualism.
describe the trp operon - CORRECT ANSWER-regulatory genes produce an inactive represser,
RNA pol produce enzymes, when tryptophan is available, no longer need to synthesize it
internally, so it binds to inactive repressor and activates the repressor. the repressor is now able
to bind to oeprator and block RNA pol.
Attenuation - CORRECT ANSWER-proposed mechanism of control in some bacterial operons
which results in premature termination of translation
Describe trp attenuation - CORRECT ANSWER-Four regions of attenuator:
- Region 1 = has two consecutive trp residues, Region 2, Region 3, and Region 4
When trp is LOW, ribosomes stalls at region 1 because there is not much trp which allows
binding of Region 2 and 3 which forms a non-terminating stem loop that allows transcription to
continue.
When trp is HIGH, ribosome does not stall at region 1 and goes onto region 2, preventing 2 and
3 from binding. Region 3 binds with region 4 to form terminating stem loop which is GC rich
followed by a string of Us which terminates translation as RNA polymerase falls off the
transcript
cooperation - CORRECT ANSWER-Behavior by two or more individuals that leads to mutual
benefit but relationship is not obligatory
Commensalism (+/0) - CORRECT ANSWER-Interaction that benefits one species, no effect on
the other
predation - CORRECT ANSWER-An interaction in which one organism kills another for food.
what is Bdellovibrio - CORRECT ANSWER-gram negative bacteria that preys on other gram
negative bacteria by entering their cells and eating their cytoplasmic material
How does Bdellovibrio divide and reproduce? - CORRECT ANSWER-forms a long filament
and divides by synchronous septation
And Well-Elaborated Answers/New!!
, Mutualism - CORRECT ANSWER-A relationship between two species in which both species
benefit
tryptophan - CORRECT ANSWER-What doe Buchnera aphidicola provide to aphids in their
mutualistic relationship?
amino acids - CORRECT ANSWER-what do aphids provide Buchnera aphidicola in their
mutualistic relationship
True - CORRECT ANSWER-True/False. 75% of the Buchnera genome is gone as a result of
mutualism.
describe the trp operon - CORRECT ANSWER-regulatory genes produce an inactive represser,
RNA pol produce enzymes, when tryptophan is available, no longer need to synthesize it
internally, so it binds to inactive repressor and activates the repressor. the repressor is now able
to bind to oeprator and block RNA pol.
Attenuation - CORRECT ANSWER-proposed mechanism of control in some bacterial operons
which results in premature termination of translation
Describe trp attenuation - CORRECT ANSWER-Four regions of attenuator:
- Region 1 = has two consecutive trp residues, Region 2, Region 3, and Region 4
When trp is LOW, ribosomes stalls at region 1 because there is not much trp which allows
binding of Region 2 and 3 which forms a non-terminating stem loop that allows transcription to
continue.
When trp is HIGH, ribosome does not stall at region 1 and goes onto region 2, preventing 2 and
3 from binding. Region 3 binds with region 4 to form terminating stem loop which is GC rich
followed by a string of Us which terminates translation as RNA polymerase falls off the
transcript
cooperation - CORRECT ANSWER-Behavior by two or more individuals that leads to mutual
benefit but relationship is not obligatory
Commensalism (+/0) - CORRECT ANSWER-Interaction that benefits one species, no effect on
the other
predation - CORRECT ANSWER-An interaction in which one organism kills another for food.
what is Bdellovibrio - CORRECT ANSWER-gram negative bacteria that preys on other gram
negative bacteria by entering their cells and eating their cytoplasmic material
How does Bdellovibrio divide and reproduce? - CORRECT ANSWER-forms a long filament
and divides by synchronous septation
