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Many cell-cycle genes from human cells function perfectly well when expressed in yeast cells. Why do you suppose that is considered remarkable? After all, many human genes encoding enzymes for metabolic reactions also function in yeast, and no one thinks that is remarkable

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Jarrod Robel
Jarrod RobelLv2
28 Sep 2019

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Related questions

Yeast cells take up inorganic phosphate as a nutrient to support cell growth and metabolism. When starved of phosphate, yeast will induce a gene encoding a broad-specificity phosphatase (an enzyme that hydrolyzes many different organic phosphate esters) and secrete the enzyme into their growth medium, effectively “mining” their environment for this limiting nutrient. The inorganic phosphate released by the secreted phosphatase enzyme is then taken up and used by the cell for growth. The phosphatase is not induced when there is plenty of inorganic phosphate in the growth medium. As part of a study on the regulation of the phosphate starvation response, you conduct a genetic screen for mutants with defects in the regulation of phosphatase secretion. You isolate two mutant strains of yeast: One strain fails to induce the secretion of phosphatase into the growth medium upon phosphorus deprivation. The other strain secretes the phosphatase even when there is adequate phosphate in the growth medium. You further show that these mutant strains bear inactivating mutations in different genes, neither of which alter the phosphatase-encoding gene itself. Propose a plausible model for how the two genes identified in the mutants might act as regulators of the phosphatase gene.

Yeast cells take up inorganic phosphate as a nutrient to support cell growth and metabolism. When starved of phosphate, yeast will induce a gene encoding a broad-specificity phosphatase (an enzyme that hydrolyzes many different organic phosphate esters) and secrete the enzyme into their growth medium, effectively “mining” their environment for this limiting nutrient. The inorganic phosphate released by the secreted phosphatase enzyme is then taken up and used by the cell for growth. The phosphatase is not induced when there is plenty of inorganic phosphate in the growth medium.

As part of a study on the regulation of the phosphate starvation response, you conduct a genetic screen for mutants with defects in the regulation of phosphatase secretion. You isolate two mutant strains of yeast: One strain fails to induce the secretion of phosphatase into the growth medium upon phosphorus deprivation. The other strain secretes the phosphatase even when there is adequate phosphate in the growth medium. You further show that these mutant strains bear inactivating mutations in different genes, neither of which alter the phosphatase-encoding gene itself.

Propose a plausible model for how the two genes identified in the mutants might act as regulators of the phosphatase gene.

For the Cellular Respiration lab, answer the the following:

1. Can yeast survive in both aerobic and anaerobic conditions? If not, which conditions can they

survive?

No. Yeast they can only survive under anaerobic conditions.

2. Hypothesis testing: What effect do you hypothesize the freeze thawing will have on the lentils

and why? Be sure to support your answer.

3. What is the function of fermentation? Why does a cell perform fermentation if it does not

produce any ATP energy for the cell? Can human cells perform fermentation?

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