Viruses that have capsids made of 20 triangular pieces are
What will be an ideal response?
icosahedral
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Which of the following is the most direct measure by which ventilation is regulated?
1.carbon dioxide levels in the blood
2.acid levels in the cerebrospinal fluid
3.oxygen levels near the carotid bodies
4.oxygen levels near the aortic bodies
The technique that can be used to record ion currents passing through individual channels is known as
A) voltage-gating. B) ligand-gating. C) patch-clamping. D) ion sensors. E) optogenetics.
A soft body usually enclosed by a hard shell is a characteristic of some
A. mollusks. B. arthropods. C. insects. D. vertebrates.
By transferring neural crest cells from a duck to a quail and vice versa, Schneider and Helms demonstrated that:
a. neural crest cells influence the development of beaks. b. beaks influence fitness traits. c. homeobox genes are conserved across species. d. gene duplication causes a difference in beak shape.