i am studying for the ap bio exam, and i am answering the practice questions but i do not have the answer key thus i need the correct answers to the following questions. thanks
1. A part of the brain used in the tranfer of info from one cerebral hemisphere to the other is the
a]medulla oblongata
b]corpus callosum
c]cerebellum
d]medulla oblongata
e]cerebrum
2. control of breathing is centered in which of the following areas of brain?
a]anterior pituitary
b]corpus callosum
c]cerebellum
d]medulla oblongata
e]cerebrum
3. all of following statements about neurotransmitters are generally true EXCEPT
a]they may cause deplorization or hyperpolarization of postsynaptic membrane
b]they are actively transported across synaptic cleft
c]they are released from membrane-bound pakets called vesicles
d]they may be enzymatically degraded at postsynaptic membrane
e]they bind to specific receptors on postynaptic membrane
4. which offers the best description of neural transmissions across mammalian synaptic gap
a]neural impulses involve flow of K+ and Na+ across gap
b]neural impulses travel across gap as electrical currents
c]neural impulses cause release of chemicals that diffuse across gap
d]neural impulses travel across gap in both directions
e]calcium wthin axons and dendrites of nerves adjacent to a synapse acts as neurotransmitter
5. which would result if sodium-potassium pump of neuron were inoperative?
a]movement of chloride ions would produce action potential
b]impulse would travel from axon to dendrites of neuron
c]rate of transmission of impulse would greatly increase
d]rate of ATP synthesis would increase
e]action potential wouldn't occur
6. which describes passage of nerve impulse through simple reflex arc in humans?
a]receptor, sensory neuron, motor neuron, association neuron, effector
b]receptor, motor neuron, association neuron, sensory neuron, effector
c]recptor, sensory neuron, association neuron, motor neuron, effector
d]effector, motor neuron, association neuron, sensory neuron, receptor
e]receptor, association neuron, sensory neuron, motor neuron, effector
7. "all-or-none" law, as it applies to impulse transmission, states which of following?
a]if stimulus is applied, either all neurons fine or none do
b]a stimulus causes either all sodium to leak into neuronal membrane or none of it
c]either all neurons develop an action potential upon stimulation or none do
d]if stimulus is at or above threshold, action potential will be generated; if not, then neuron will not fire
e]either all neurons will be repolarized or none will be
thanks :}
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