The afferent neuron in the knee-jerk reflex is the:
A. stretch receptor sensory neuron.
B. extensor muscle motor neuron.
C. flexor muscle motor neuron.
D. spinal interneuron.
A
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Which statement best describes the relationship between elevation and latitude?
A. Elevation and latitude are related because they have similar effects on temperature. As the elevation increases, the temperature of the air decreases, which is likewise with latitude. B. Elevation and latitude are related because they are both measurements of distance. C. Elevation and latitude are related because as one increases the other increases. D. Elevation and latitude are related because they have similar effects on temperature. As the elevation increases, the temperature of the air increases, which is likewise with latitude.
Which of the following traits is an X-linked recessive disorder?
A. Marfan syndrome B. cystic fibrosis C. sickle-cell disease D. color blindness E. Tay-Sachs
Fusion would be used to fuse hydrogen atoms to form
a. carbon. b. oxygen. c. nitrogen. d. helium. e. phosphorus.
If a typical somatic cell has 64 chromosomes, how many chromosomes are expected in each gamete of that organism?
A) 32 B) 128 C) 16 D) 8 E) 64