Drosophila geneticists discovered a mutant fly strain in which the expression of

Question

Drosophila geneticists discovered a mutant fly strain in which the expression of eve stripe 2 extended in the posterior direction. In other words, stripe 2 was wider than normal, and had spread in the posterior direction. Which of the following is the most likely cause of this phenotype?

A.A mutation silencing the gene encoding Kruppel

B. A mutation silencing the gene encoding Bicoid

C. A mutation silencing the gene encoding Hunchback

D. .A mutation increasing the level of expression of the gene encoding Bicoid

E. A mutation silencing the gene encoding Giant

In order for the structure of a solitary transmembrane beta-barrel such as OMPLA to be energetically favorable, the amino acid side chains on the outside of the beta-barrel should be

A. neg charged

B. hydrophobic

C. polar, not charged

D. pos charged

E. mix of hydrophillic side chains, uncharged

The power was off last night, and the yeast cultures in your incubator cooled down from 25 degrees to 20 degrees Centigrade in temperature. To your great relief, you find that the yeast cells did not die. However, when you analyze the composition of the lipids in the plasma membrane of your yeast cells, you disco

A. .there is a higher percentage of long chain fatty acid residues in the cells grown at 20 degrees than when the cells were grown at 25 degrees C

B. there is a lower percentage of long chain fatty acid residues in the cells grown at 20 degrees than when the cells were grown at 25 degrees C

C. there is a higher percentage of unsaturated fatty acid residues in the cells grown at 20 degrees than when the cells were grown at 25 degrees C

D. A/C

E. B/c

Explanation / Answer

Drosophila geneticists discovered a mutant fly strain in which the expression of eve stripe 2 extended in the posterior direction. In other words, stripe 2 was wider than normal, and had spread in the posterior direction. Which of the following is the most likely cause of this phenotype?

E. A mutation silencing the gene encoding Giant

In order for the structure of a solitary transmembrane beta-barrel such as OMPLA to be energetically favorable, the amino acid side chains on the outside of the beta-barrel should be

C. polar, not charged

The power was off last night, and the yeast cultures in your incubator cooled down from 25 degrees to 20 degrees Centigrade in temperature. To your great relief, you find that the yeast cells did not die. However, when you analyze the composition of the lipids in the plasma membrane of your yeast cells, you discover

B. there is a lower percentage of long chain fatty acid residues in the cells grown at 20 degrees than when the cells were grown at 25 degrees C

C. there is a higher percentage of unsaturated fatty acid residues in the cells grown at 20 degrees than when the cells were grown at 25 degrees C

B /C

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