The nervous system is to the ectoderm as the skeleton is to the
A. allantois.
B. chorion.
C. endoderm.
D. blastula.
E. mesoderm.
Answer: E
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In the following pedigree, the indicated trait is most likely caused by which type of allele?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked
The two continents that suggested continental drift are called:
a. North and South America. b. North America and Europe. c. South America and Africa. d. Europe and Asia. e. Australia and India.
The brain knows how strong a stimulus is
because the brain interprets
a. action potentials of certain nerves in certain ways. b. variations in the rate of action potentials. c. the size variation in the action potential being propagated. d. all of these. e. all of these except size variation in the action potential being propagated
The finding that mutations in synapse genes are associated with many genetic disorders that have a behavioral
component suggests that _____. a. individuals with these mutations lack synapses b. individuals with these mutations lack neurotransmitters c. malfunctions in presynaptic neurons cause abnormal behavior d. malfunctioning synapses are associated with abnormal behavior e. behavior disorders are attributable to environmental factors