Rats placed in isolated and unenriching environments become learning-impaired due to the:a
increased development of dendritic spines.
b. lack of development of proper neurotransmitters.
c. development of large numbers of glial cells.
d. biochemical changes resulting in a heavier cerebral cortex.
e. poor development of synaptic contacts.
E
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Which of the following is most likely to be true about the mouse and rat myosin genes?
A. The nucleotide sequences are identical. B. The genes encode proteins with different functions. C. The genes are similar in sequence, but not identical. D. There is no homology between the two sequences. E. The genes encoding myosin closely resemble those encoding actins.
Which layer of the skin is composed of stratified squamous epithelium cells? a. Epidermis b. All of these choices have stratified squamous epithelium
c. Hypodermis d. Dermis e. None of these choices have stratified squamous epithelium.
The pacemaker is located in the atrioventricular node
____________________ Indicate whether the statement is true or false.
In a line graph, the value of the independent variable is:
a. represented on the y-axis. b. represented as bars extending from the y-axis. c. represented as long lines extending from the right side of the graph. d. represented on the x-axis. e. represented as "slices in a pie."