Down syndrome is associated with
a. mental retardation.
b. abnormal skeletal development.
c. weak muscle reflexes.
d. slowly developing motor functions.
e. all of these.
E
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Which of these features is found in both nonvascular and vascular plants?
a. lignin b. roots
c. cuticle d. xylem e. phloem
The brain is surrounded by a set of membranes called the
a. pleural membranes. b. peritoneum. c. pericardial membranes. d. meninges.
The observation that most pureblood Native Americans have type O blood is best explained by _____
A. gene flow. B. assortative mating. C. genetic drift. D. a founder effect. E. frequent mutations.
The person in the above figure is afflicted with
which of the following hormonal disorders? a. acromegaly b. dwarfism c. low levels of rhGH d. parathyroid radiation poisoning e. none of these