Where the highest levels of gibberellins are found?

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#Question id: 24635

#Unit 2. Cellular Organization

In E.coli topoisomerases I and III is responsible for

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#Question id: 3671

#Unit 3. Fundamental Processes

_____________ promotes recombination between specific sites on the plasmid if the same site occurs more than once in the molecule, as it would in a dimer or multimer.

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#Question id: 33341

#Unit 2. Cellular Organization

The shape-determining protein crescentin in Caulobacter is related to the:

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#Question id: 10922

#Unit 6. System Physiology – Plant

The non-reducing sugar sucrose is most commonly translocated in the phloem rather than reducing sugar. Why?

 a.) because they are less reactive than their reducing counterparts

 b.) because sucrose contains more energy than a monosaccharides

 c.) because the ketone or aldehyde group is reduced to an alcohol or combined with a similar group on another sugar so as not to be oxidized

 Which one of the following statements is true about translocation of non-reducing sugar?

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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