What is the cause of Down syndrome?
A. an extra chromosome on the 21st pair
B. an extra X chromosome on the 23rd pair
C. neurotransmitter excesses
D. neurotransmitter deficiencies
Answer: A
You might also like to view...
Fred, Barney, George, and Bart are ten years old, and each suffers from a different sleep disorder. Fred occasionally shifts suddenly during the day from a normal waking state into several minutes of sleep, during which time he has very little muscle tone and is effectively immobile. Barney walks in his sleep (but does nothing else), while George sometimes moves to act out his dreams. Bart has
nightmares (but not sleep terror disorder). Who is least likely to be in the REM stage of sleep when he exhibits his symptoms? a. ?Fred b. ?Barney c. ?George d. ?Bart
Children who have premature puberty resulting in full sexual development have
a. given birth as early as five years of age. b. an oversecretion of pituitary growth hormones. c. an undersecretion of adrenal sex hormones. d. a thyroid disorder.
Your palms sweat when you see exam booklets even on days that you do not have an exam; this is an example of ______ conditioning
Fill in the blank with correct word
A baby’s ability to manipulate objects greatly expands with the development of __________, use of the thumb and index finger opposably
A) the pincer grasp B) the grasp reflex C) the ulnar grasp D) prereaching