Chapter 11 Quiz Questions Flashcards

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1
Q

Why do bacterial cells need to coordinate their metabolic reactions?

Adapt to changing conditions

Save energy

Produce compounds when needed

All answers are correct

A

All answers are correct

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2
Q

If a bacterium is grown within a nutrient rich medium that contains all of the amino acids required for protein synthesis, what will happen?

the bacterium will synthesize its own amino acids and only use the amino acids within the medium when energy levels are low in the cell

the bacterium will use the amino acids from the medium preferentially and not synthesize the amino acids until those in the medium are gone

the bacterium will use the amino acids within the medium, while also building new amino acids at the same time

the bacterium will synthesize its own amino acids and only use the amino acids within the medium when energy levels are high in the cell

A

the bacterium will use the amino acids from the medium preferentially and not synthesize the amino acids until those in the medium are gone

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3
Q

When the growth rate is held constant for bacteria

cells will release toxins to kill other cells of the same species

cells will be richer in certain components, especially RNA

cells will have the same macromolecular composition

cells will remove DNA to conserve energy

A

cells will have the same macromolecular composition

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4
Q

What coordinates metabolism within bacterial cells?

lipid activity and amounts

nucleic acid activity and amounts

enzyme activity and amounts

nothing, all reactions occur at the same time at the same levels

A

enzyme activity and amounts

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5
Q

Feedback inhibition is a method

used to control enzyme amount by phosphorylation

used to control enzyme amount by changing the amount of ATP available

used to control enzyme activity with a sRNA binding to mRNA

used to control enzyme activity through an allosteric change

A

used to control enzyme activity through an allosteric change

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6
Q

Gene expression is primarily controlled at which level in prokaryotes?

proteolysis

transcription initiation

post-translational modification

translation initiation

post-transcriptional modification

A

transcription initiation

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7
Q

Which of the following is true of regulation of protein synthesis in bacteria?

attenuation is a process that regulates proteolysis

there is only one type of sigma factor present in most bacteria that helps in promoter recognition

sRNA can downregulate transcription initiation

mRNA is generally very stable and has a half life of days to weeks

enhancers are proteins that bind to repressor DNA sequences to control transcription

A

sRNA can downregulate transcription initiation

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8
Q

Which of the following is TRUE regarding operons?

Operons contain structural genes that encode products that act in the same metabolic process

An operator is a sequence of DNA that acts in controlling whether an operon is expressed or not

All of the answers are true

The Lac operon is expressed when lactose is present and glucose isn’t

Operons contain genes that are transcribed using a common/single promoter sequence

A

All of the answers are true

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9
Q

Groups of operons regulated together are

regulons

sub-operons

genes

not possible

A

regulons

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10
Q

The stringent response system is

a regulon activated in response to oxidative damage

a modulon activated in response to lack of glucose

a modulon activated in response to starvation

a regulon activated in response to heat

A

a modulon activated in response to starvation

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