In the diagram, what would happen to the concentration of C if the concentration of A increases?
a) increases
b) decreases
c) no change
Answer: a
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Which domain of intracellular receptors binds to responsive elements in the nucleus?
A) DNA-binding domain B) Transactivation domain C) Ligand-binding domain D) Membrane-binding domain
Triggering of the muscle action potential occurs after
A) acetylcholine binds to chemically gated channels in the motor end plate membrane. B) acetylcholinesterase binds to receptors on the end plate. C) calcium ion binds to channels on the end plate. D) the nerve action potential jumps across the neuromuscular junction. E) Any of these actions can produce an action potential in the muscle cell.
Which of the following is false?
A. Melatonin makes us feel alert and awake. B. The pineal gland is found within the diencephalon of the brain. C. The pineal gland secretes melatonin in a cyclical fashion. D. The pineal gland forms part of the epithalamus.
Cerebrospinal fluid is reabsorbed into venous blood in the dural sinuses via the ________
A) cerebral aqueduct B) hypothalamus C) arachnoid granulations D) choroid plexus E) pons