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.

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#Question id: 8946

#Unit 9. Diversity of Life Forms

Which two groups have members that undergo ecdysis?

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#Question id: 8947

#Unit 9. Diversity of Life Forms

Organisms that are neither coelomate nor pseudocoelomate should, apart from their digestive systems, have bodies that

TLS Online TPP Program

#Question id: 8948

#Unit 9. Diversity of Life Forms

What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates

TLS Online TPP Program

#Question id: 8949

#Unit 9. Diversity of Life Forms

Which of the following functions is an advantage of a fluid-filled body cavity?

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#Question id: 8950

#Unit 9. Diversity of Life Forms

You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?

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#Question id: 8951

#Unit 9. Diversity of Life Forms

An animal that swims rapidly in search of prey that it captures using visual senses concentrated at its anterior end is likely to be