You use several model organisms in your lab's research. Which of your model organisms would you expect to exhibit a higher mutation frequency: E. coli, D. melanogaster, or M. musculus?
What will be an ideal response?
M. musculus
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During Drosophila development, there is a regulatory cascade of gene activation. The proper sequence for this cascade is _____
A) bicoid, gap genes, pair-rule genes, and segment polarity genes B) bicoid, pair-rule genes, gap genes, and segment polarity genes C) bicoid, segment-polarity genes, gap genes, and pair-rule genes D) bicoid, gap genes, segment polarity genes, and pair-rule genes
You are a virologist studying a particularly pathogenic virus that infects sea turtles. In the course of your research, you discover that the virus is destroyed by a protein-digesting enzyme. The structure most vulnerable to this enzyme must be the viral
a. membrane. b. envelope. c. DNA. d. capsid.
When you eat an apple, the core left over is the ovary.
a. true b. false
In a negative feedback mechanism, the _____ is a muscle or gland that functions to carry out the selected response
receptor control center effector factor