Yeast cells grown in a nutrient-rich medium and then shifted to a medium lacking essential amino acids rapidlyreduce their level of splicing of transcripts for:
A. iron response genes.
B. mating factor genes.
C. AU-rich elements.
D. ribosomal protein genes.
D
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In animal eggs, once fertilization occurs, ________ are the second messengers that trigger egg activation.
Fill in the blank(s) with the appropriate word(s).
What is the result of demyelination of axons?
a. reduction of the speed of action potential conduction b. increase in the threshold of excitation of the neuron c. increase of the speed of action potential conduction d. decrease in the threshold of excitation of the neuron
What are some of the possible factors associated with aging?
What will be an ideal response?
Kin selection refers to
A) the selection of a mate. B) deciding which related animals can live in the colony. C) deciding which related animals can share the food. D) determining which related animals must live and which must die. E) an animal promoting the survival of the genes of its close relatives.