Practice Questions

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#Question id: 4540

Transcription of eukaryotic genes can be repressed in various ways. These include the four mechanisms

1. Competition

a-Repression is caused by recruiting histone modifiers that alter nucleosomes in ways that inhibit transcript

2. Inhibition

b-A repressor binds to a site on DNA beside an activator and interacts with that activator, occluding its activating region

3. Direct repression

c-By binding to a site on DNA that overlaps the binding site of an activator, a repressor can inhibit binding of the activator to a gene and thus block activation of that gene.

4. Indirect repression

d-A repressor binds to a site upstream of a gene and, by interacting with the transcriptional machinery at the promoter in some specific way, inhibits transcription initiation.

#Unit 3. Fundamental Processes

1-a, 2-b, 3-c, 4-d
1-c, 2-b, 3-d, 4-a
1-b, 2-c, 3-a, 4-d
1-a, 2-c, 3-b, 4-d

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TLS Online TPP Program

#Question id: 4601

#Unit 11. Evolution and Behavior

DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?

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#Question id: 2090

#Unit 2. Cellular Organization

Peripheral proteins bound to the exoplasmic face of the plasma membrane can also bind to:

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#Question id: 20413

#Unit 3. Fundamental Processes

Positive selection such as Mutations conferring antibiotic resistance in bacteria or venom-resistance of pray is example of

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#Question id: 34150

#Unit 7. System Physiology – Animal

A 7-year-old boy is evaluated for short stature. His average circulating growth hormone level is within the normal range for his age, but levels of IGF-I are reduced. His growth failure is most likely due to a defect in:

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#Question id: 15902

#Unit 12. Applied Biology

The pair of hormones required for a callus to differentiate are____

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Nurturing Life Sciences

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Nurturing Life Sciences

1. Competition	a-Repression is caused by recruiting histone modifiers that alter nucleosomes in ways that inhibit transcript
2. Inhibition	b-A repressor binds to a site on DNA beside an activator and interacts with that activator, occluding its activating region
3. Direct repression	c-By binding to a site on DNA that overlaps the binding site of an activator, a repressor can inhibit binding of the activator to a gene and thus block activation of that gene.
4. Indirect repression	d-A repressor binds to a site upstream of a gene and, by interacting with the transcriptional machinery at the promoter in some specific way, inhibits transcription initiation.