A cross section of the spinal cord indicates that gray matter is ____
a. densely packed with myelinated axons
b. composed mostly of unmyelinated axons
c. densely packed with cell bodies and dendrites
d. composed only of dendrites
c
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Whether people enjoy or dislike time alone depends on
A. their gender. B. the number of siblings they grew up with. C. how much social contact they have at work and during the day. D. their preference for solitude level.
The DNA in chromosomes is organized into segments called ____
a. DNA b. RNA c. genes d. nucleotides
What began as a single fertilized egg has just separated into two distinct eggs. This indicates the formation of ____ twins that has occurred during the ____ period of development.
A. fraternal; zygotic B. fraternal; embryonic C. identical; zygotic D. identical; embryonic
In contrast to activity in the left hemisphere, activity in the right hemisphere
A) is especially active between 3 and 6 years and then levels off. B) increases steadily throughout early and middle childhood. C) peaks between 1 and 3 years and then dramatically falls off. D) peaks during adolescence.