Ouabain is a chemical used on poison arrows in Africa. It works by inhibiting the sodium-potassium pump. What effect does this chemical have on an action potential?
A) It prevents the stimulation of an action potential by removing sodium from the cell.
B) It immediately causes an action potential to be generated.
C) There is no direct effect because the pump is used to maintain ion distributions, not to cause an action potential.
D) It causes the release of a neurotransmitter that causes an action potential.
C
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Differentiate between the following terms: threatened species, endangered species, and extinct species. What will be an ideal response?
Phagocytes have a pathogen-recognition system known as ________ that leads to the recognition, containment, and destruction of a pathogen
A) collagen B) fibrin C) pattern recognition receptors (PRR) D) pathogen associated molecular pattern (PAMP)
A chemical interaction in which the products contain less free energy than the reactants is called a(n)
____________________ reaction.
Fill in the blank(s) with the appropriate word(s).Which of the following observations best indicates that living things evolved in different time periods?
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