Rods and cones, like most sensory receptors, depolarize open receiving a stimulus.
Answer the following statement true (T) or false (F)
False
Photoreceptors differ from other sensory receptor cells because at rest in the dark, their membrane potential is slightly depolarized. In response to a light stimulus, the membrane potential becomes less positive than it was in the dark.
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Match the following items with the correct phrases.
_______1. ____________________ is a virulence factor that is found in (and released from) the cell walls of Gram-negative bacteria. _______2. The molecules on the surfaces of host cells that pathogens are able to recognize and attach to are known as receptors or ____________________. _______3. Molecules on the surfaces of pathogens that are able to recognize and bind to molecules on the surfaces of host cells are known as ligands or ____________________. _______4. ____________________ is also known as “spreading factor.” _______5. ____________________ are toxins that destroy white blood cells. a. adhesins b. endotoxin c. hyaluronidase d. integrins e. leukocidins
An action potential can best be described as a _____
a. trigger zone b. kinetic activity c. brief reversal in the polarity of the electric gradient across the plasma membrane d. peak of energy that does not resolve to its former state e. brief increase in the polarity of the electric gradient across the plasma membrane
Protection Mechanism III: biochemical
What will be an ideal response?
Separation of the chromatids at the end of metaphase leads into the next phase, which is:
A) anaphase. B) post-metaphase. C) telophase. D) interphase. E) prophase.