Gene therapy is currently under investigation as a possible way to cure cystic fibrosis. How is the viral vector carrying the normal gene delivered to the affected cells?
A) injection
B) bacterial plasmid
C) nasal spray
D) ingestion
E) application to skin
C
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Which of the following is the motor endplate?
A. the terminal membrane of the motor neuron where neurotransmitter is released B. the portion of the membrane of the muscle cell that has receptors that respond to the neurotransmitter released by the motor neuron. C. the membrane of the sarcoplasmic reticulum where calcium is stored D. the Z disc where two sarcomeres adjoin
Which of the following is correct regarding the blind spot?
A. It's an area of the retina where rods and cones are concentrated. B. It's caused by a nontransparent area on the cornea. C. It's an area of the retina where there are no rods or cones. D. It's caused by a nontransparent area on the lens.
Which of the following factors may have favored the evolution of simple multicellularity?
A. All of these options are factors that may have influenced the evolution of simple multicellularity. B. increased ability to avoid predation C. increased ability to maintain a position in the water column D. increased ability to remain in a location that is favorable for growth E. increased ability to generate water currents for feeding
The innermost membrane layer surrounding the brain and spinal column is the:
a. dura mater. b. meninges. c. arachnoid. d. pia mater.