A normal fertilized egg, or zygote, contains ________ pairs of chromosomes.
A. 23
B. 28
C. 46
D. 21
Answer: A
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Research has shown that young infants do not see detail at a distance as well as adults do and need more contrast than adults in order to see well. According to the text, what research method was used??
a. ?assessment of anxiety levels when the primary caregiver is at various distances b. ?observation of facial expressions and head movements as well as the duration and intensity of suckling during feedings c. ?measurement of the amount of time the baby spends viewing a pattern rather than a uniform screen d. ?qualitative interviews with parents and other caretaking adults
If some of the axons innervating a given cell are destroyed or if they become inactive, what compensatory process takes place in the remaining presynaptic cells?
a. activation of previously silent synapses b. removal of toxins c. denervation supersensitivity d. collateral sprouting
A child who is observed to be withdrawn, unhappy, insecure, and passive has probably been raised by _______.
a. authoritarian parents b. authoritative parents c. permissive parents d. indulgent parents
Of all hearing difficulties, the __________ has the greatest impact on life satisfaction
A) inability to hear at high frequencies B) inability to detect soft sounds C) age-related decline in speech perception D) responsiveness to startling noises