I. MULTIPLE CHOICES (3 points per item; i2 points per section total) During pren
ID: 3467864 • Letter: I
Question
I. MULTIPLE CHOICES (3 points per item; i2 points per section total) During prenatal development, cellular differentiation into our major biological systems occurs during which stage? A. zygotic B. germinal C. embryonic D. fetal 2. 1n the study of birth defects, alcohol, nicotine, and lead are considered to be A. carcinogens. B. toxins. C. inhibitors. D. teratogens. 3. Menstruation and ejaculation are examples of which aspect of puberty? A. genital characteristics C. primary sex characteristics B. latency characteristics D. secondary sex characteristics 4. Infants acquire their ability to focus their gaze on an object before they can reach it. This is an example of which type of development? A. sensorimotor B. proximodistal C. cephalocaudal D. preoperationalExplanation / Answer
1.(B)
The germinal stage refers to a stage in the embryonic development when the sperm and egg cell unite in one of the two fallopian tubes and the process of cell division and growth begins in the zygote (fertilized egg). Cell division begins approximately 24 to 36 hours after conception.
2.(D)
A teratogen refers to an agent that can cause a birth defect by disturbing the development of an embryo or fetus when the expecting mother is exposed to such an environment during her pregnancy.
3.(D)
4.(A)
Sensorimotor skills refer to the process of receiving sensory messages such as gaze and producing a motor output such as the use of arms.