Under what circumstances does the gene called zenk become active in zebra finches, and what is its
effect?
What will be an ideal response?
Transcription of the zenk gene is stimulated when the zebra finch hears its species' song. Zenk
produces an enzyme that changes the structure and function of neurons. The outcome is an auditory
sensitization to slight variations in the song.
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What term is used to describe the phenomenon in which a bacteriophage genome incorporates its genome into the chromosome of the host?
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When baroreceptors are stretched, nerve impulses from these receptors ultimately cause a(n) ________ in cardiac output
Fill in the blank(s) with correct word
Disease-causing agents like viruses or bacteria are considered a(n)
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What is generally true about essential elements and living organisms?
a. Although all forms of life require iron, other elements are required only by certain species b. All organisms require 25 of the 92 naturally occuring elements to survive c. Given their low concentration in nature, the toxicity of some elements is generally not a factor in the evolution of biological communities d. The elements carbon, hydrogen, nitrogren and and oxygen make of 20-25% of living mass.