Mutations in the DFNA20/26 Locus,which Codes for the Actin Gamma

question 33

Multiple Choice

Mutations in the DFNA20/26 locus,which codes for the actin gamma 1 protein,are associated with congenital deafness.An irate senator complains that government money is being wasted on studies of this mutant gene -- in yeast! "I am no biologist," says the senator,"but I am pretty sure yeast don't have ears." How do you respond?

• A)"You are right,Senator -- yeast do not have ears.We should revoke the funding immediately."
• B)"We can learn valuable information about the structure of the mutant protein by expressing it in yeast.It is difficult to collect large amounts of actin from tiny hair cells,and unethical to collect it from human patients."
• C)"We can learn valuable information about the transcription of the mutant gene in yeast.It is much more difficult to study transcription in human cells."
• D)"We can learn valuable information about sound transmission through the mutant yeast.By placing a speaker against a yeast vial and recording sound from the other side,we can infer how the mutant actin affects sound waves."

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Definitions:

Ionic Bond

A type of chemical bond that occurs when an atom transfers an electron to another atom, typically forming a bond between a metal and a nonmetal ion.

Hydrogen Bonds

A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.

Capillary Action

The ability of a liquid to flow in narrow spaces without the assistance of external forces like gravity.

Water Transport

The movement of water and solutes across a plant, from roots to leaves, through the xylem and phloem, essential for nutrient distribution and photosynthesis.