The phrase all-or-none response describes a neuron-generated action potential. Explain what is meant by this phrase
What will be an ideal response?
Action potentials are produced when the membrane potential (voltage) of the neuron is temporarily reversed by the sudden inward movement of ions from interstitial fluid. The ions can move in only when there is an opening or channel in the membrane. In the case of most neurons, the ion that moves inward via gated channels is sodium. These channels open only when there is a sufficiently strong stimulus; they do not partially open to weaker stimuli. So either the threshold must be reached to achieve an action potential, or the threshold is not reached, and therefore no action potential is generated.
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Denaturation disrupts the secondary and tertiary structure of proteins. However, denaturation is not strong enough to disrupt what interaction that is relevant to protein structure?
A. ionic bonds B. hydrophobic exclusion C. peptide bonds D. van der Waals attraction E. hydrogen bonds
Stramenopiles are unique in that they possess:
A. double plastids B. hairy flagella C. alveoli D. flexible protein ribbons beneath the plasma membrane E. calcium carbonate crystals
Cloned B cells which produce antibodies that are specific to a particular antigen are called _______ cells.
Fill in the blank(s) with the appropriate word(s).
Desmosomes allow materials to pass directly from one cell to another
Indicate whether the statement is true or false