What is the relationship of genetics to Huntington’s disease?
a. It is caused by a dominant gene on the X chromosome.
b. It is caused by a dominant gene on chromosome 4.
c. It is caused by a recessive gene on one of the autosomal chromosomes.
d. There is no evidence linking Huntington’s disease to any gene.
The all-or-none law states that:
a. a neuron produces an action potential of maximal strength, or none at all.
b. all neurons fire or none at all.
c. all neurons in a pathway fire at the same time, or none do.
d. all ions move in the same direction, or none do.
Infants have several reflexes, such as the ____ and the ____, that are not seen in adults.
a. knee-jerk reflex; rooting reflex
b. Babinski reflex; knee-jerk reflex
c. rooting reflex; Babinski reflex