Ch06 Microbial Regulatory Systems Test Bank — Practice Questions & Answers

Ch06-Microbial Regulatory Systems Test Bank Ch06-Microbial Regulatory Systems Test Bank




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General Microbiology (Howard University)




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Brock Biology of Microorganisms, 15e, Global Edition (Madigan et al.)
Chapter 6 Microbial Regulatory Systems

6.1 Multiple Choice Questions

1) Regulation of enzyme activity occurs
A) at the start of transcription.
B) at the start of translation.
C) posttranslationally.
D) at any point on the enzymatic production pathway.
Answer: C
Bloom’s Taxonomy: 1-2: Remembering/Understanding
Chapter Section: 7.15

2) When arginine is added to a culture already growing exponentially in a medium without
arginine, what occurs?
A) All cellular growth ceases.
B) Growth continues, but the production of enzymes required for the synthesis of arginine
ceases.
C) Growth continues, but the production of enzymes required for the synthesis of arginine
increases.
D) The cell returns to the lag stage of growth to synthesize the proteins necessary for the
metabolism of arginine.
Answer: B
Bloom’s Taxonomy: 3-4: Applying/Analyzing
Chapter Section: 6.2

3) Regulatory proteins
A) are influenced by small molecules.
B) bind to specific DNA sites.
C) regulate transcription.
D) regulate transcription, bind specific DNA sites, and can be influenced by small molecules.
Answer: D
Bloom’s Taxonomy: 1-2: Remembering/Understanding
Chapter Section: 6.1

4) A protein region with a specific function and structure is called a
A) conserved site.
B) domain.
C) locale.
D) motif.
Answer: B
Bloom’s Taxonomy: 1-2: Remembering/Understanding
Chapter Section: 6.1




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5) Transcriptional regulators bind most frequently at the site of DNA.
A) major groove
B) minor groove
C) histone complex
D) primary supercoil
Answer: A
Bloom’s Taxonomy: 1-2: Remembering/Understanding
Chapter Section: 6.1

6) Which type of regulator(s) specifically binds to operator regions of DNA?
A) activators
B) activators and inducers
C) repressors
D) repressors and corepressors
Answer: C
Bloom’s Taxonomy: 1-2: Remembering/Understanding
Chapter Section: 6.2

7) The lac operon is an example of control in which the presence of an is
required for transcription to occur.
A) negative / activator
B) negative / inducer
C) positive / activator
D) positive / inducer
Answer: B
Bloom’s Taxonomy: 1-2: Remembering/Understanding
Chapter Section: 6.2

8) Enzyme induction occurs
A) when the substrate is present.
B) when the organism is environmentally stressed.
C) continuously.
D) when the substrate is depleted.
Answer: A
Bloom’s Taxonomy: 1-2: Remembering/Understanding
Chapter Section: 6.2

9) Considering the catabolite repression mechanism, which observation would make you suspect
it IS occurring?
A) CRP bound to promoter sites
B) elevated levels of transcripts for maltose and sucrose catabolism
C) relatively low intracellular cyclic AMP levels
D) RNA polymerase bound to biosynthetic promoter sequences
Answer: C
Bloom’s Taxonomy: 5-6: Evaluating/Creating
Chapter Section: 6.4

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