Do you think that nonsubstance-related addictions, such as compulsive gambling or compulsive eating, have a greater genetic or environmental component compared to substance-related additions, such as nicotine? Explain your reasoning
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Background:
Addictions develop from a stepwise series of physiological adaptations that alter brain function following repeated exposure to certain environmental stimuli. As with other behavioral disorders, family studies (pedigree analysis), twin studies, and adoption studies have concluded that many different types of addiction have genetic components.
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Meiosis in flowering plants gives rise to cells that are ____
a. haploid gametophytes b. diploid sporophytes c. sporophytes that can be haploid or diploid d. diploid gametophytes e. haploid sporophytes
The recognition site for a restriction enzyme is 5? ACCGG^T 3?. The ^ symbol indicates the site of cleavage. After digestion of DNA with this restriction enzyme, how will the ends of the resulting DNA fragments look?
A) They will have sticky, single-stranded ends with 5? overhangs. B) They will have sticky, single-stranded ends with 3? overhangs. C) They will have blunt ends. D) They will have sticky, double-stranded ends. E) The result cannot be predicted using only the information given.
What structures in the circulatory system of the vertebrate body have valves? Consider this carefully. Do they function in the same general fashion?
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In peas, tall plants are dominant to short plants. A cross between a tall pea plant and a short pea plant results in half the progeny being tall, and the other half being short. Therefore, the tall parent plant is genotypically
A) homozygous. B) heterozygous. C) hemizygous. D) monozygous. E) homogeneous.