You observed the two species of barnacles, species 1 and species 2, occupy upper and lower strata of intertidal rocks, respectively. Only when species 1 was removed by you from the upper strata, species 2 could occupy both the upper and lower strata. From the choice given below what would be your inference from these observations.

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#Question id: 3892

#Unit 3. Fundamental Processes

The DNA binding motif for many prokaryotic regulatory proteins, such as the lac repressor, is:

TLS Online TPP Program

#Question id: 3893

#Unit 3. Fundamental Processes

Protein structural motifs often have general functions in common.  Which one of the following motifs is known to be involved in protein dimer formation, but not in direct protein-DNA interactions?

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#Question id: 3895

#Unit 3. Fundamental Processes

Which one of the following types of eukaryotic regulatory proteins interact with enhancers?

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#Question id: 3896

#Unit 3. Fundamental Processes

Which one of the following is not involved in steroid hormone action?

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#Question id: 3898

#Unit 3. Fundamental Processes

Which one of the following classes is expressed in the unfertilized egg and is involved in directing the spatial organization of the Drosophila embryo early in development?

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#Question id: 26476

#Unit 3. Fundamental Processes

Some of the definitions are given match them correctly

Column 1	Column 2
1. Repressors bind to specific sites on the DNA. In bacterial cells, such binding sites, called	a. effector
2. Regulation by means of a repressor protein that blocks transcription is referred to as	b. positive regulation
3. Activators bind to DNA and enhance the activity of RNA polymerase at a promoter; this is	c. negative regulation
4. Repressor binding to DNA is regulated by a molecular signal called	d. operators