Monozygotic twins __________
a) are genetically identical.
b) are genetically different.
c) will be of different sexes.
d) are more likely to occur when a woman is taking fertility drugs.
a
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Which word in parentheses better fits each of the following definitions?
1. Basic building blocks of the nervous system (nerves, neurons) 2. Cell parts that receive nerve impulses (axons, dendrites) 3. Site of communication between neurons (synapse, myelin sheath) 4. Opiate-like substance in the brain (dopamine, endorphin) 5. Chemicals that make it possible for neurons to communicate (neurotransmitters, hormones) 6. Hormone closely associated with emotional excitement (epinephrine, estrogen)
Women who become pregnant during __________ are more likely to have premature deliveries
a) menopause b) midlife c) adolescence d) illness