Harold is so sad that for months he can barely get out of bed. If he does, he just sits at the kitchen table with his head on his hands. Yet for a few weeks, about once every four or five months, he reverses mood. He becomes chatty and animated, uncharacteristically spending lavishly. Harold most likely has
A) schizophrenia.
B) euphoria.
C) bipolar disorder.
D) major depressive disorder.
C) bipolar disorder.
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In a homozygous genotype:
A. both alleles for a given trait are the same. B. the two alleles for a given trait are different. C. the individual will be phenotypically dominant. D. the individual will be phenotypically recessive. E. both alleles for a given trait are the same and the individual will be phenotypically dominant.
Clumps of microtubules in aging neurons are called
a. beta amyloid. b. neurofibrillary tangles. c. neural atrophy. d. plaques. e. ganglionic fossae.
Following fertilization, the somatic cells of humans divide by:
a. apoptosis b. mitosis c. meiosis d. DNA replication
An exercise stress test is useful to diagnose several types of cardiovascular problems.
a. true b. false