5 You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.

Describe the cis-acting elements in the GLN1 promoter that are evident from these experiments, giving both their position and as much of their function as you can deduce.

#Question id: 11282

#Unit 10. Ecological Principles

Which of the following ecosystems would likely have the largest net primary productivity per hectare and why?

#Question id: 11283

#Unit 10. Ecological Principles

Herbivore ingests plant material with 1000 k j energy form producer and assimilated only 200 k J energy in their blood stream; additionally herbivore invests 120 k j energy in their maintenance. What is production efficiency of that herbivore?

#Question id: 11284

#Unit 10. Ecological Principles

Which of the following could qualify as a top-down control on a grassland community?

#Question id: 11285

#Unit 10. Ecological Principles

Terrestrial herbivores are animals that eat only plants and their digestive systems contain microbes that aid in the digestion of cellulose, Carnivores eat primarily animal flesh or fluids. Which of the following is correct is correct statement?

#Question id: 11286

#Unit 10. Ecological Principles

Consumption, assimilation, and production efficiencies are measures of ecological efficiency. Following some statements are correct?

(A) Consumption efficiencies for carnivores are typically higher than those of herbivores

(B) Assimilation efficiencies of herbivore are often less than consumption efficiencies

(C) Vertebrates tend to have lower production efficiencies than invertebrates

#Question id: 11287

#Unit 10. Ecological Principles

What is value of evenness in community 3 and 4 respectively?