A Researcher Has Arrived at a Method to Prevent Gene

question 19

Multiple Choice

A researcher has arrived at a method to prevent gene expression from Drosophila embryonic genes. The following questions assume that he is using this method.
-The researcher measures the concentration of the polypeptides from different regions in the early embryo and finds the following pattern (darker shading = greater concentration) :

Which of the following would be his most logical assumption?

• A) The substance has moved quickly from region 5 to region 1.
• B) Some other material in the embryo is causing accumulation in region 1 due to differential binding.
• C) The cytosol is in constant movement, dispersing the polypeptide.
• D) The substance is produced in region 1 and diffuses toward region 5.
• E) The substance must have entered the embryo from the environment near region 1.

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Definitions:

Incision Line

The mark or wound made by a surgical cut into the body, often referring to its appearance during the healing process.

Intermittent Sutures

A stitching technique used in surgery where stitches are placed individually, tying off each separately rather than in a continuous line.

Knot

A fastening made by tying a piece of string, rope, or other material around itself or another object, often used as a means of securing, binding, or limiting movement.

Wound Irrigation

The process of cleaning a wound with a steady flow of a solution to remove debris, bacteria, and dead tissue.