Which vitamin is produced in humans when exposed to sunlight?
a. A
b. B1
c. C
d. D
e. folic acid
D
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Evolution is the result of selecting only those mutations that result in an increased reproductive success
Indicate whether the statement is true or false
Imagine an insect that is making its way from the outside of a tree to the inside of the tree. Put the layers that it would it encounter in order, starting with the outermost later.
a. Secondary xylem. b. Primary xylem and pith. c. Cork cambium. d. Cork. e. Remains of primary and older secondary phloem.
When the concentration of a ligand is equal to the KD which of the following is true?
A. All of the ligands are bound to receptors. B. All of the receptors are bound to ligands. C. Half of the receptors are bound to ligands. D. Half of the ligands are bound to receptors. E. All of the ligands and receptors are bound to each other.
Taste cells and the carotid bodies are alike in that both
A. respond to changes in pH. B. are chemoreceptors. C. utilize pressure to activate sensory receptors. D. are found in the mouth. E. respond to distant stimuli.