Examlex
What is the first level of control of eukaryotic gene transcription?
Iris
The colored part of the eye surrounding the pupil, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
Visible Light Waves
Electromagnetic waves that are visible to the human eye, which perceive them as colors.
Pupil
The adjustable opening in the center of the eye that allows varying amounts of light to enter.
Doughnut-shaped
Having the shape of a doughnut; circular with a hole in the center.
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