Which of the following enzyme has a unique ability to introduce positive and negative supercoiling of the DNA and it is the target for antibacterial agents such as ciprofloxacin/quinolones?

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#Question id: 7762

#Unit 5. Developmental Biology

Correlation between life span and the ability of fibroblasts to repair DNA in various mammalian species, Repair capacity is represented in autoradiography by the number of grains from radioactive thymidine per cell nucleus. According to graph, which factor exist on x-axis ? Note that the y-axis (life span) is logarithmic.

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#Question id: 2798

#Unit 2. Cellular Organization

A key component of the eukaryotic transcription machinery called TFIID includes a

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#Question id: 12238

#Unit 10. Ecological Principles

The mussel Mytilus edulis thrives in saline habitats, in both the highly salty seawater of tidal zones and the less salty estuaries. This results in two kinds of populations: one adapted to the higher salt concentrations of the tidal zone, and one adapted to the lower salt concentrations of the estuary. It has been found that the more salt-tolerant populations have high frequencies of an allele that produces an enzyme involved in maintaining osmotic equilibrium. Conversely, estuarine mussels having the same enzyme seem to be disfavoured and have a much higher death rate than mussels without the allele. Adult estuarine populations do have lower frequencies of this allele. Each spring, large numbers of larvae from  the salty habitats pour into the estuaries.

The invasion of the seawater larvae would be expected to facilitate change in the genetic structure of the estuarine population by a process called

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#Question id: 19074

#Unit 4. Cell Communication and Cell Signaling

ETI causes__

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#Question id: 34178

#Unit 3. Fundamental Processes

A. SSBs interact with ssDNA in a sequence-independent manner. 

B. SSBs primarily contact ssDNA through electrostatic interactions with the phosphate backbone and stacking interactions with the DNA bases.

C. SSBs interact with ssDNA in a sequence dependent manner via hydrogen bonds with phosphate backbone

D. SSBs shows sigmoidal behaviour of binding

Choose true and false