The plasma membrane
A. separates the nucleus from the rest of the cell.
B. is a rigid protein membrane.
C. has a single layer of phospholipids.
D. regulates movement of materials into and out of the cell.
E. is not permeable.
Answer: D
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Which statement about the brain stem is incorrect?
a. contains the medulla b. passageway for most fibers passing between the peripheral nervous and higher brain centers c. controls sociosexual behaviors conducive to mating d. contains part of the reticular activating system e. contains centers that control respiration, blood vessel and heart function, and digestive activities
After the ribosome moves to the next codon on the mRNA, the growing peptide chain is found in which position(s)?
A P E A, P and E
Define motor unit
A) A motor unit is the sum total of all the motor neurons going to a specific muscle. B) A motor unit is the sum total of all the muscle fibers in a whole muscle. C) A motor unit is the maximum tension that a whole muscle can generate with maximum stimulation. D) A motor unit is a motor neuron and all the muscle fibers that it controls. E) A motor unit is the sensory neuron going away from and the motor neuron going to a skeletal muscle.
Explain how the neurotransmitter acetylcholine is removed from the synaptic cleft.
What will be an ideal response?